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Acetamiprid, carbendazim, diuron and thiamethoxam sorption in two Brazilian tropical soils. - Portal Embrapa

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Ju~'~,,/ ujl::~,i,u~m,""'/ S<iencr,,~d H.a/lh P"'I

8 t200

7f

42

, 4

!W-S07

Cop)'''t!I' DTa)'I", & F"'nc\~ a'uur. tLC

ISS:'>!, 0360·1234 (Pnn.); IS32·41lt9 (Onlm.'

DO!"

10 IOSO/Om !2J07QIJ§94J9

0..

Taylor &Francis ~ _."~

..

,,,-,

Acetamiprid

,

carbendaz

im

,

diuron

and

thiamethoxam

so

rption in two Br

az

ilian

tropical

so

ils

LEANDRO

CA

RB

O

I,

EU

CAR

L

OS

L

.

MARTI

NS

I,

ELI

ANA

F.

G.

C.

DORES

I,

C

LAU

DIO

A.

S

PADOTT

0

2

.

OSCAR

Ll

NA

L

,

S,

W

E

BER

J

and

E

RMELl

N

D

A

M.

D

E-

L

AMONICA-

FR

EIR

E

4

I tA UH - Lobor(l/ório di' Análises di' Ri'sidr/Os di' Bioci{/as. Unirersidruh' fI.'r/eral dI' /limo Grosso. Crdabà, MT. Ora:il 2 Embrapa Meio Ambii'II/i', Jaguarizinu. São Paulo. Bra:il

J FAMEV _ FaCIlidade de Agronomia e Medici/Ui Vf.'/aimiria. Unilwsidadl' Federa! de Ma/o GrO,UI/. Cuiabá. MT. Bra;il -I UN JVAG Ce/1/ro UI,il"ersi/(jrio. Vár;"'1 Grandl'. MT. Bra;il

Sorplion

of

acewmiprid

«

(E)-N

1-[

(6-ch

l

oro-3-py

r

iJyl)rnethyl)-N2-cY<lno-N I-methylacetamidinc

)

.

carbcndazim

(

m

e

l

hyl

bc

n

zimid:lZol-2-ylcarbamale),

diu

ron (N-(3.4

-d

ichlorophenyl)-N,N-dimclhyl

urea)

;md

thiamethoxam

(3-(2-chloro-Ihi:lzol-5-y

l

melhyl

)

-5-mclhyl-[

1.3.

5]oxadiazinan-4-y!idcnc-N-nit

r

oamine

)

lVa

s

evaluated in

llV

O

13ra

zilian

lropical

soils.

Oxisol and

Em

isol.

from

Prim

avera do

L

csle

region,

M

aIO Grosso

State.

13r

:lli

l. T

o

describe

l

hc

so

rplÍon

process, b

a

leh experimenls were

carried

OUI.

Lin

e

ar

an

d

Freundlich

isotherm

models were used

10 ca

l

cu

l

ale

lhe K

d

and

Kj

coenicienls from

expe

r

ime

ntal

data.

T

he

K.t

val

u

es I-I'ere

Ulilized 10

cillcul<ne

lh

e

p

arlilion

eoefficienl normalized

10

s

oil orga

n

ic c:ubon

(KM).

F

or

th

e

peslicides acelarniprid,

carbe

n

d

...

zim.

diuro

n

and

Ihiamcnlhoxan lhe

K

", (mL

g

_l)

valucs r;mged in

bo

th

soils from 98

-

3235,

1

02

4

-

264

4

.

14

5 -

2631

a

nd

10

4

-

2877.

r

espcctively.

Fr

om

the

studied pesticides.. only carbcndazim

presemcd

eorrela

li

oll

(rl

=

0,82 ,l11d P

<

0.0

1

)

I-I'i

t

h

soi

l

organic carbon

(

O

C

)

conlen

l.

Acelamipr

i

d

and

lhiame

t

hoxam

showed

l

ow sorptio

n

cocfficienls,

rcprescnting

li

high

risk of

s

urraee

and g

r

ound

I-I'aler

con

tamination

,

Ke

ywo

r

ds:

Sorption isothc

rm

: groundwater: organic c:lrbon:

High

P

erformance

L

iquid

Chro

mal

ograp

h

y-

D

iode

Arfay

D~I~ttor;

con

t

amina

l

ion

.

Introduction

Agricu[lure ac

t

ivities

hav

e bee

n

in

l

ensified

for

lhe

l

ast

20

years

in l

h

e

B

razilian

sav

anna

region.

Th

e monocu

lture

s

grown

thcrc dcma

l1

d

li

high degrec

of

mechanization and

input

ofag

r

oc

hemica[

s

,

in

p

a

rticular

synthc

t

ic

pcs

l

icidcs.l'l

I

ntcnsive use

o

f pesli

cides

in

agri

c

ul

turc

may

cause

envi-ronm

C

l1tal

pollution,

s

u

ch

a

s

lhe

con

l

aminalion

o

f

soi

[

,

surfac

e and

g

r

o

u

nd water

and

p

ose

r

is

k

s

lo human

hea

lt

h

due

to

r

cs

iducs

in

food

and drin

k

ing watcr.P

7]

Pes

t

ic

i

des

ClI

n foll

ow diffe

rent rout

es

fr

o

m

l

he

soil:

ret

e

ntion

i

n

o

r-ganic and/o

r

mi

neral

soi

l

fr<1ction

,

c

he

mical.

ph

oloc

hem-ica

l

a

n

d

bi

o

l

ogica

l

degr

adati

oil

,

vo

l

atiliZ;

lti

o

n

,

r

unoff and

l

ea

ch

i

ng.l

8

1II

Th

e so

rpl

io

n

is

an

im

po

rtant

factor

r

eg

u

lal

i

n

g pes

l

icides

behavior in

th

e

environmc

n

t

,

being usefu[ informatio

n

to

Addres

s

correspon

d

cnce

10

Leandro Cilrbo

, LA R ()

-

L

abora

t

ório

do:

Anúlises

de

R

esiduos

de

B

ioc

i

das,

Dcp

art;

lm

ento de

Q

uimica.

U

n

iversidade

F

ede

ra

l

de

Ma

IO

G

r

osso. Av

. F

crn

and

o Co

rr

ê

a

da

COSIa

,

s

/

n

,

Cu

ia

bá,

MT

.

U

razil;

E

-mail

:

ca

r

boquimico

@

h

o

tmail

.

co

m

.

Rcc~ived

OclObc

r

9,

2006.

foresee

lh

e

co

nwm

i

nati

o

n p

o

tenl

ia

l

o

f

s

urface

and

grollnd

wa

l

e

r

50

il

is

impo

rt

ant

l

o

lIndersland

lh

e so

r

pti

on

pro-cesses and

il

s

relationship wilh

soi

l pllr

a

m

c

t

ers.

1

12-151 Somc

pesticide properlies, which

i

nfluence

so

rpl

ion

l

o

lhe

soi

l

pa

r

ticles are

waler

solubi

lit

y. va

por pre

ssure. oc

tan

o

l

-w

at

e

r

partit

ion coe

m

cie

nt and

<lcid-basc ionizaliOIl

conS

I

<l

111

for

io

n

iz

ablc

co

m

po

un

ds.l l

6

10

1

I

n

l

he

soi

l

s

,

mineral

composi-l

io

n and

soi

l

o

r

g

a ni

c

matter

a

r

e im

p

o

rtalll

f

a

cto

r

s

affecting

so

rpt

io

n

o

f p

esticides

.l8

,

9

,

1

4.21

2111

In

B

razil,

ca

rbcnda

zim

,

acclamiprid, di

u

ron

and

I

hi-amcthox

llm

are pesticides commoul)'

u

s

ed

in

cotton

and soybean crops

.

H

owever

,

th

C

f

C

are

f

ew s

ludie

s

I

hal

eval

u

ate

t

heir

be

ha

vio

r

in lropical

clima

l

e.

Jl1

.

lJ

1

T

here

lIre

on

l

y

lim

i

ted

data avai[ab1e

o

n lh

e so

rpl

io

n

of

carbend

a

z

llll

,ll ]

.

16

.29

1

diur

onI12.

1

4.I

s.JOI

i

.

nd

especi

a lI

y

for

ac-etll

miprid,

and

Ih

iame

th

oxam.13

11 M

o

r

eover.

studie~

011

so

r

ptioll

o

f

pesl

i

cides

o

n d

ifferent

soil

horizons are

prac-t

icll

ll

y

non-exis

lent.

T

hus.

thi

s

wor

k

il

i

m

ed: (

i

)

to

deler-m

in

e lhe

so

rpl

ion of

acetamiprid,

ca

r

bcndazi

m

,

diuron

and

Ih

iamethoxam

in

tw

o

llra

zi

lian tropical

soi

[

s (

Ent

isol

and

O

xisol)

wilh diffcren

t

physica[

a

nd

chemical

properties,

s

u

ch

as

so

il

type. p

H

.

o

r

ganic rnaller and mineral

compo

-nent

s

; (

ii)

lo

compa

r

e

the

so

rpti

on

behavior of

th

e s

t

udied

(2)

500

pe

s

t

ici

dc:

s

with

availab

l

e

data

from

lh

e

lilcra

t

urc.

Th

is

infor-ITIati

on

will

contribule

t

o

l

he betler undcrsllInding

a

f lhe

d

ynamics

af

pcsl

icides

in tr

o

p

ica

l

envi

r

o

nmcnt

s

.

Ma

t

eria

i

s

and M

c

t

h

ods

Che

mi

c

al

s

und

SOlllr

i

o

n

.f

Pc

s

l

ici

de primary

st

an

dards

o

f

ca

r

bcndazi

m

(97.

0

%

purity

)

and

a

c

ctam

ip

r

id (95.0

%

)

from Ehrenst

o

rfcr Quality and

di-ur

o

n

(98.8

%)

and th

i

amcthoxam

(99.5

%)

from S

y

ngenla

\\lere

acqui

r

e

d

.

M

C

lhan

ol

and a

cc

lonitril

e [

Mall

i

nckrodt

Ult

i

mar

,

high perf

o

rman

ce

liquid ch

r

o

mal

ogn

lph

(

I-IPL

C)].

w;!ter ultrapure g

r

ade

Milli

_

QR

(

1

8

M

n

e

m

)

and anhydrous

c

alc

iu

m

c

hl

o

ride

(CaCI2.

J

.

T

.

U

a

k

er) \Vere

u

se

d

. QU3Tllil

a-ti

ve

fllt

c

r

paper

(F

iltntr)

[25

mm

diamete

r

and

fiber

g

la

ss

membrane (Sartori

u

s

GM

F

3)

4

7

mm diam

e

l

c

r

and 0.4 11

m

p

o

r

osi

!

)'

w

e

re util

ized

f

o

r fihration

o

fthe

solu

t

ion

dcr

i

ving

fr

o

m lh

e so

rpl

i

on

assay.

St

oc

k

so

lulions

o

f ea

c

h pc

s

ticide

werc

preparcd

in

a

ce

ton

i

lril

e a

t

:t

co

ncentrat

io

n le

ve

I of

1

00

~Lg mL~]

and

ma

i

nla

i

ned under rerri

gc

r

ali

o

n

.

W

o

rk-i

n

g s

tand

a

rd

so

lul

io

n

s

w

ere

prepa

r

ed

b

y

di

lut

ing

stoc

k

so-lut

io

n

s

as required,

f

or c

hr

oma

tog

r

aphic analysis.

For the

so

rpl

io

n

experiments.

s

t

oc

k

s so

lut

ions

wcre

pr

epa

rcd

fram

lh

e

primar

y s

tandard

s. i

n

me

lhan

o

l

ai

100 I

lg

mL

-I

.

Soil .~'umpliflK

T

w

o

Ir

enches

\Ve

r

e

opcned,

o

n

e in an

Oxi

50

1

and

a

nolhe

r

i

n

11!1

Entisol

,

which we

r

e charac

t

erized

in

lh

e soil's

h

o

ri

zo

n

s.

Sai

1

s

amples

wer

e co

ll

ec

t

e

d

in

thr

ce

r

e

pl

ica

te

s

in

f

o

ur

hori-zons o

f lhe O

x

i

so

l

(

Ap

.

A

/

U

.

Uwl

and

8w2

)

and in three

h

orizo

n

s

of

Enti

so

l

(

A

,

Cl

and

C

2) from lhe

Pr

i

ma

ve

ra

do

L

es

t

e

reg

i

on

,

Mato Gr

osso

Slate.

B

ra

z

i!. 10

ca

l

e

d ai

1

5

°

25'

latitude S

o

uth

and

5

4

°

3

2

'

l

ongi

tude We

s

t.

Th

e ch

cmical

:lnd phy

sic

al

propcrt

ics

of

lh

e so

il wcre

ch;tr;\cterized

u

si

ng

m

e

t

hods desc

ri

bed by Embrapa.1321

T

he

soi

l

o

r

g

an

icc

arb

o

n

(OC)

wa

s

determined by

Walkl

ey

-

B

lack

's

m

e

t

hod.

Sorp,iofl erperiments

Soi

l

sa

mpl

es

wer

e

ai

r

-d

r

i

ed

f

o

r 4

8

h.

sieved

I

hrough a #

10

m

e

tal

siev

e (Tyler equivalenl9 me

s

h,

o

pcn

i

n

g 2

mm

).

Sorp-l

i

o

n as

s

ays

we

r

e

p

e

rf

ormed

acco

r

ding t

o

lh

e

m

Clhod

de

-se

r

i

be

d by Souza

e

l

al

.

114)

whe

r

c

5.0 g

o

fs

o

i

l

was

w

eig

hed in

1

25

mL-e

r

lenmeye

r

and 25

mL

ofcalciull1 chloride

(C

aC

I

1)

so

lut

io

n

O.Olmo

l L

-

I ",e

r

e

added

,

used as a bl

l

ckground

elec

lr

o

l

y

t

e

to m

i

m

ic

r

c

ali

stic soi!

ionic

s

tr

e

n

g

lh and

to

he

l

p

Oo

cc

ulation

of

ela

y

pan

iclcs.IIS.Jl)

Thi

s

m

ix

ture ",a

s

fO

rl

ified with each

pe

s

li

c

ide

by

adding

propcr

aliquolS

o

f

stoc

k

so

l

u

t

ions (c.a.

1

00 /1.g

m

L

-

I)

prepar

c

d

i

n ll1

e

thano

l

in

o

rder lo reach in

c

r

easing

eo

n

ce

n

tral

io

n

s:

1

.0;

2.0;

4

.

0;

8.

0 and

1

6.0

/1.g m

L

-

I.

Thc

so

il

s

we

re

ag

i

taled

i

n

a

me-c

han

ica

l

s

haker

aI

140

rpm f

o

r

24

h

o

ur

s.

10 r

e

a

ch

equi-l

ibrium. A

li

experiments

wer

e

performed

i

n

d

upl

ic

ale

and

Coroo

c

t a!.

o

ne

b

l

;

lIlk

sa

mple

was

includ

e

d

in e"ery

sa

mple

b

at

cl!

1

0

check

for inl

e

rfcri

n

g

pcak

s.

Several

,Iulho

r

s

have

delllon-SlTalcd

lhal

gC

llenllly

pcs

t

icidc equilibri

um

in

lh

e

blllch

so

l

uti

o

n

is

r

eachc

d

in

lc

ss

lhan

2

4h

.)IS

.

J4.1S)

Thcref

o

r

e.

lhe

24h-s

h

aking

pcr

iod

was chosen

.

Th

c sol

ution

was filtcrcd

t

hrough a

q

uanlit

a

li

ve

fill

e

r paper

followed

by glass fibc

r

membranc

(0

.4

5 /.I

.

m)

a

n

d

1.0 mL

aliquo

t

fram lhe

fi

llr

a

l

e

was

Iran

s

f

e

rred l

o an

aU

l

os

ampl

e

r

via

l

3nd

ana

l

y ... .ed by

H

ig

h

P

e

r

for

man

c

e

L

iquid ChromalOgraphy/with

D

iodc

Array Del

ec

tor

(

HPL

C

-

D

AD

).

For

so

rplio

n

coe

lTi

eie

nl d

c

t

c

rm

i

nation lhe

L

in

e

ar and

Fre

u

ndli

c

h

m

o

del

s

we

r

e

u

l

ili1.ed.

F

o

r lhe Linear m

od

el

.

r

egression 'lIlalysis was

made

by

pl

o

lling lhe am

o

unl

of

so

r

bcd

pes

l

icide

per

uni

l

o

f

so

i! ma

ss (

X

/

Ms

)

a

s

a fun

c

l

ion

oflhe peslicide

CO

nten

l

ra

l

io

n in lh

e so

lul

io

n

in

eq

u

i

librium

(Ce),

as delllonSlTaled in

th

e

E

q

ual

io

ll I

:

X

- =

K

d. Ce

M

s

(

I)

I

n turn

,

lhe

Freundli

ch

so

rp

l

ion

m

ined

thr

ough

E

q

uali

on

2:

iso

th

enn

W1IS

de

t

e

r-~

=

K

.

Ce

l/"

M

s

f

(2)

wherc.

X

/

M

s is

lh

e a

m

o

unt

of so

r

bed

peslieide

pe

r

un

i

t

o

f

so

il ma

ss (

mg kg

-

I),

Cc

is

th

e

pc

s

ti

cidc

concentration

in

equi

l

ibriulll in

th

e so

lul

io

ll

(mg

L

-

I),

K

f

is

lh

e

Freundl

ich

so

rp

ti

o

n

coe

fficient

and

I

/

n i

s

lh

e

l

i

n

ea

rit

y cocmcie

nt

of

l

he

iso

therm

.

P

art

it

i

on co

cm

cie

nl n

o

rmali

ze

d

t

o org

an

ice

arb

on (

K

«)

wa

s c

al

e

u

l

a

t

ed

fr

o

m K

"

and

the

pcrcenlag

e of o

rgani

c ca

r

-bon

pr

eStnt

in

t

he

soi

l

sa

mpl

e,

according 10

E

q

u

'llio

n

3:

K

K

= - -' -

x

100

<>C

%

CO

(3)

Slulislicu/ unu/y.\ü

Th

e

kru

s

k

a

l

-

Wal1

i

s

non-pa

r

am

e

tr

ic

l

eS

I W

<tS u

se

d t

o

com-p

a

re the K

", K

f

and

I

/

n paramet

e

r

s

f

o

r ea

c

h

soi

l

horizon

.

T

he

r

elationship between

l

hose

K

",

K

f

and

K

«

v

alu

cs

with

p

l-l

,

D

C

(

%

OC)

and

%

day content we

r

e determi

n

ed by

re

-gression

anal

ys

i

s

u

s

ing

l

he

P

e

a

r

so

n t

es

t

C

P

<

0

,

05

)

a

imi

n

g

t

o

verify

lh

e

infl

u

e

n

ce

ofthese

50i

l p

r

opc

r

ti

es

on

the

sorption

of

the

st

udi

e

d pe

s

licides.

bUlrumt!nlaliofl unJ I1peruling c(JnJit;ons

The

co

n

centration of

pesticides was

de

t

e

rmined u

sing

a

high

performance

li

q

uid

c

hr

o

mat

ograp

h

with

diode a

r

-ra

y U

V

detector

(

HPL

C/DAD).

Var

il

m

®

e

q

uippcd

with

a

q

ual

e

rnar

y

pump, model

2

40.

au

l

o

mal

ic

injeclor

m

od

cJ

410

, variab

l

e waveleng

l

h di

ode

arra

y

detec

t

o

r

(UV-DA

D

)

1l1

0dcl 330 and chromalographic

co

lumn

with

s

tal

ionary

pha

s

e Omn

i

Spher

CIS

(

parl

i

cl

e size

5/~,1ll),

2S

em

long

,

4

.

6

mm

inside

dia meter and

3/8 i

n

ches

of

ex

t

ernaI dia

m

e

t

er

.

(3)

Sorplio

n

in 111'0

B

ra::ilüm $oils

50

1

'"

A

"

i

~

"

,

,

i

,

í

,

1

o

"

I

I

,

~

i

,

!

,

Â

,

"

j

K

J..

,

,

o

,

' o

"

.

B

"

o

~

~

"

,

,

"

,

5

.

5

'so

I.

'H)

o

'us

F

i

g.

1.

HP

L

C chromalograrns

: (a) standa

rd

solut

i

on of

thiarnethOllOarn,

c,1rbendaz

irn.

acc

tamipr

id

and

d

iuro

n

ai $

.

0

jlg

rnl

-I

and

(

b

)

sorp

li

o

n tC

SI

o

f diuron aI 4

.

0 Il

S

ml

_

I

.

Fo

r

H

PL

C

ana

l

ysis,

all

;

ll

iquol

(10

It

L

)

was

injcclcd inl

O

lhe

co

lumn

:

I

nd

el

utc

d

ai

ro

o

m temperaturc wi

t

h

consta

nl

fl

ow

rat

e

o

f 1.0

mL min

-

t

under

l

he

foll

ow

ing

g

r:t

dient

co

n

di

t

i

ons

:

i

n

i

t

ia

t

i

n

g

wilh

acelonitr

il

e-waler aI 25

:75

lh

e

co

ntent

of

acetoni

lril

e was

i

nc

r

eased

lin

e

arl

y

10

100

%

aI

15 min and h

e

ld

:1\

th

is co

mpo

si

tion f

o

r

3

min

o

T

hc

chro-matogram

s

weTC

r

eco

rd

ed

aI :1

wa

ve

len

g

lh

o

f

230

nm

and

retention

times

we

re:

5

.

0

m

in

f

o

r

th

iametho;li;an

, 5.8

m

i

n

f

or

ea

r

bcndazim

,

6.2

min f

o

r acetamip

r

id.

:

md

9.3

min f

o

r

di-ur

on

(Fig.

I

).

The

dele

c

t

io

n

and q

u

anlificali

o

n

l

i

m

its

O

flhc

rn

ethod were

:

0

.

0

8

and

0.40

/1-

g

L

-

I for

Ih

iamctho;li;am,

0.

11

and

0

.41

Jlg

L

-

I

f

or ca

rbcnd

azim,

0.06 and 0.40 j~

.g

L

-

I

for

acclam

iprid

.

0.0

7

and

0.42/Lg

L

-

I

f

or

diur

o

n, r

cs

pcc

t

ivcl

y.

R

es

ult

s a

nd Di

s

cu

ssio

n

T

hc mcan va[uc

s o

f lh

e s

oil

samplc

properti

es

a

r

e given

in

Ta

blc

I.

Ther

e

was

a

re

l

alively wide

range

of

OC

fro

m

0

.32

t

o

1

.

56

%

in

Oxjsol

and

f

TOm

0.48

to

1.40

%

i

n

Ent

isol.

Ka

o

lin

i

t

c

and

gibb

si

le

weTC

lh

e

ma

jo

r min

er

ai

s

in

lhe

Oxisol h

o

riz

o

n

s

B

wl

and

B

w2,

wit

h

con

l

cn

lS of

2

1

9 (13

w

l

)

and

324

(

13

w2) g

kg

-

I

o

f ka

o

l

inile

and 1

8

2 (

B

w

l

)

c

206

(

B

w2) g

kg

- I o

f

gibbsile.

Min

or quantitics

of goc

thile (

58

and

6

8

g

kg

-

I)

and hematilc (6 and

9 g

kg

-

I)

werc

presen\.

I

rOI1 and a

l

urn

i

null1

oxides

in

l

he

OX;

50

1 h

o

ri

zo

n

s (

Ap

,

B

wl

e

O

w2)

r;mgcd fr

o

m 40

10

52

and

f

TOm

1

66

t

o

280 g

kg-

1,

Tab

l

e

1

. Select

e

d

pro~rties

of

Oxi

sol

an

d

Em

isol

uscd

in so

rp

tton

i

so

the

rm

eJ(periments

p

H

0

0'

Sat

rd

C/o)' Cfo},fOC

So

U

H'

Deplh (em) H~O CoCI1 (~)

Oxis

o

l

Ap

0-20

5.

92

4

.

70

1.56

63

33

21.2

AI

S

20·40

5.

3

0

4

.

60

1.47

7.

27

18.4

B

w

l

40·92

5.09

4

.

90

0.99

63

35

35

.4

B

w2

92

·

1

78

5.77

5

.

1

0

0.32

63

35

1

09.4

Enti

sol

A

8·43

5.00

4

.

3

0

1

.40

66

32

22.

9

C

I

52-8

4

4

.

9

8

4.50

0

.

73

60

'"

54

.

8

C2

84--11

4

5

.

05

4

.20

0.4

8

60

17

77.

1

·orgalllc carbon; tsoll honzons. OC; organic carbono

(4)

5

0

2

Carbo

ct

aI.

TlIble 2.

AI.'t:tamiprid

sorption

paramctcrs

for

F

rcundlich and Lillc;u modcl

s

wilh

COllfidence inlen<al.

O

ifTerenl Cllpil:ll

lella

s

within CllCh

co

lumn de

n

Ole

si

gnifica

n

l difTcrcnces ai

p

<

0

.05

(Kruskal-Wal1is

n

on-p.1T:lmelr

i

c

t

esl)

Kd

"

K

or

b

Kf'

Soil

lIo

r.

mLg-1

I

C95

%

,

mLg-t l~gl-t/~g-1 mL I/~

I

C95

%

"

1

11'"

IC95

%

,

-O

xi501

Ap

1

.95

A

1.39

-

2.5

1

0

.889

1

25

1.

99

A

1.49 2

.

66

0.955

0

.

98

1

AO

0

.79

1

-

1.l71

A/B

1

.

66

B

1

.44-

1

.8

8

0

.957

II

J

1.77

A

1.

40

2.24

0.960

0.955 A

O

.

796

-

1.l1

3

I3

wl

0

.97

C

0

.

92-1.02

0

.

996

98

LI

1

B

1.0

1

-

1.23

0

.993

0.956

D

0.891

1

.020

O

wl

1.75

D

1.

64-

1.

86

0

.

993

547

1.

0

1

O

0

.

84-1

.

22

0

.985

1

.

263C

1.136

-

1.390

E

nti

sol

A

2.

1

4

E

1.

95-2

.33

0

.

987

15J

2.24

A

1

.84--2.74

0.969

0

.

9701\

O

.

828

-

U

II

C

I

7

.

5

1

F

6.49

-

8.53

0

.

968

1

0

29

5.53 C

4

.52

-

6.78

0

.

962

1

.

209

BC

1

.

012

-

1.4

06

C2

15

.53

G

12

.20-

1

8

.

86

0.925

3235

8

.

87 D

6.49

-

1

2

.

13

0.894

1.478 E

1

.063

-

1

.8

92

~linear sorpllOIl c~fficll:nl; ~Kd normalized for org.1nic carbono 'Fn:unlich sorpllon coefficicnt. dlllleanlY.

r

espec

t

ively.

T

he cJ

"

y mi

n

c

ral

cO

m

pOSi

l

io

n

o

f

Entiso

l

wa

s

n

O

I

d

eterm

i

n

ed.

S

o

rp

l

io

n

o

f

aCela

m

ip

r

id

.

c

ar

b

enda

zi

m

.

d

i

u

ron and

I

hi-amet

h

ox

a

m we

r

c

c

v

a

luat

cd qua

n

lila

li

vely by

l

he

Fr

e

-u

n

dlic

h

an

d Li

near isotherms, w

h

ose

r

cs

u

h

s

a

r

c

s

h

ow

n

in

Tab

l

cs2

1

0

5.

D

ec

r

easi

n

g

K

a va

lue

s

f

ordi

u

ron.ca

r

bendazim

and acc

la

mi

pr

id wÍlh dep

l

h

in

lhe

O

xisol was

obse

r

ved

.

ex-ce

pl

in

l

he

B

w2

h

o

r

i.wn.

i

n

w

h

ic

h

lhe

K

"

va

lu

es

fo

r

diuron

a

n

d acelamip

r

id increased.

I

n En

t

iso

l

.

inve

r

se

t

e

n

dcncy was

obser\'ed; i

.

c. an

i

nc

r

eas

i

ng so

rpt

ion

(

K

.,,)

o

f

ac

ct

a

m

ip

r

id.

di

u

ron 3nd

th

ia

m

c

lh

oxa

m w

i

l

h

d

ep

th

. excep

l

f

or

c

ar

b

en

-d

a

zi

m

.

f

o

r

wh

ic

h

K

"

redu

ced i

n

s

u

bs

ur

f

;t

cc.

T

he

K

.,.

va

lu

es

f

o

r

'

I

ce

lamip

r

id s

h

o

wc

d

s

i

g

n

ificant

C

P

=

0.05)

d

iITc

r

enc

e

a

m

o

n

g a

lI

h

o

ri

zo

n

s i

n

bO

l

h

soi

l

s (

T

ab1c 2).

I

n A

p

and

A

/

H

ho

r

izo

n

s.

n

o

significant

di

IT

e

r

cnce

in

K

f

v

al

-u

cs was

obse

r

ve

d

,

a

s

",

cll

as in

B

w

l

and

B

w2

h

o

r

izons.

Th

e

so

rpt

ion coemcien

t

s

o

f

lhis

pe

s

t

ici

d

c

s

h

owcd

n

o

c

o

r

rc

l

a

t

ion

with

soil

a

ll

ribu

t

es

(

P

earson co

rr

ela

l

io

n

).

T

he

ca

r

bcndazim

K"

va

lu

cs

in

A

/

B

and

I1

wl hor

i

zons

w

e

re

sig

n

ificanl

l

y

(

p

<

0.05) di

fT

c

r

cn

l fr

om

Ap and

O

w2

h

o

r

izons

of

lhe

O

xiso

l

(

Ta

b

l

e

3).

Th

e

K

/

va

l

ucs

s

h

owc

d

sl

at

is

l

ical

d

i

fT

c

r

c

n

ce

(

p

<

0.05) a

m

o

n

g a

li l

h

e h

o

ri

zons o

f

lhe O

xiso

l

a

n

d n

o

s

t

ll

l

is

l

ica

l

di

fT

e

r

e

n

cc w

a

s

f

o

u

nd be

l

wee

n

lhe

C

l

a

nd

C2

h

orizo

n

s

o

flh

e

Enl

iso

l

.

Co

m

p

ar

i

n

g

l

he

Kf

v

al

ues be

l

we

en

l

he

Iw

O soi

l

s, a si

m

i

la

r

sorp

t

iol1 W:

1

S ve

r

ificd

in

l

he

s

urfa

cc

h

o

r

izon o

f lh

e

Em

iso

l

an

d

in

l

he

I

WO

I

O

p

h

o

r

izo

n

s o

fl

he

O

xiso

l

(

Ap a

nd

A

/

(1

).

Th

e

50

rp

lion

O

fl

his

pe

s

l

ici

d

c

r

c

du

ced i

n d

ee

pcr h

o

r

izo

n

sof

lh

c

O.~isol

p

rofi

le.

I

n

t

he

1\\'

0

l

o

p h

or

i

l.ons of

l

he

I

wo

soi

l

s,

ca

r

bcn

d

azi

m

s

h

owt.'

d

lar

ge

r

so

rpl

io

ll

i

n r

e

l

a

l

io

n

10

l

he

o

th

er

sl

ud

icd

pcs

l

icides

(

Figs.

2

a

n

d

3).

Th

e

K

....

va

lu

es

f

o

r

ca

r

bcnd

a

zim (

T

ablc

3)

s

h

owed

li

n

l

e

\

'

arialio

n

among lhe horizons

of

O

xiso

l.

wi

lh

highc

r

val

u

c

(

1

7

1

6 m

l

g

-

I

OC) in

I

heA

p

horizo

n

.

w

h

i

l

ein

lhe Emiso

l

lhe

so

rpl

io

n

w:u

I

<lrge

r

i

n

lhe C2

h

orizo

n

(K

«

=

2640

m

l

g

-

t

O

C)o Thosc

v

ul

ucs wc

rc

in ag

r

c

em

ent wi

lh Ih

ose

fo

un

d

by

Ne

m

e

lh

-

K

o

n

d

a

c

l a1.

1I61,

w

h

o f

o

u

nd a

K

""

o

f

2805

m

L

gl

O

C

f

o

r Ih

is pes

li

c

i

de.

S

i

l

va

and

Mel

o l

29

1

obse

r

vcd

I

ha

l

sor

pl

io

n

o

f car

bcndazi

m

i

n

:1

lurf

soi

l

dep

e

n

ded

011

lhc

o

r

g:

m

ic

mal-I

c

r

co

nl

e

nl

in hig

h

e

r

eX

l

e

nllhan

o

n d

ay

co

nl

cnl.

B

e

r

g

l

õf

el

a

l

1l31 s

t

udied

l

he carbc

n

dazi

m

so

rp

lio

l1 i

n V

i

cl

m

l

rll

cse

soi

l

s

wi

l

h

ph

ysical

a

n

d

chcmica

l

prope

rl

ies

sim

il

ar

10

l

he

soi

l

u

sed

h

ere :

m

d

r

ou

nd

K

....

v

a

l

u

es

Ihal ranged f

r

om 960

10

2

700

ml g

-I.

T

he sorption

co

c

fficic

lll

K

f

fo

r

carbcndazim

p

rcsen

t

ed

a

co

rr

el:

l

lio

n

high

l

y sig

n

ifica

nl

(r1

=

0.82 an

d

p

<

0.0

1

)

wilh

O

C con

l

ent

in bO

l

h

soi

l

s.

bci

n

g

l

he

sa

rll

e

verified

1

0

K

"

v

a

I-ues

.

bU

I

w

il

h

l

ess

signi

fi

ca

n

c

c

(

r

2

=

0

.97

and

p

<

0.05). This

w

a

sco

nfirm

cd by

lh

e

r

e

d

u

c

l

i

o

n

i

n

sor

p

l

io

n

cocfficie

nl

s

wilh

lhe d

ec

re

ase of o

r

g

an

ic ca

r

bo

l1

co

nl

e

nl

dce

p

e

r

d

ow

n

l

he

soil

p

rofi

l

e

(

Ta

b

l

e

3).

T

o lhe

o

lher

soi

l allr

ibu

l

es.

no

co

r

re-lali

on was

ve

r

i

fi

c

d

.

B

crg

l

õf e

l

a

l

l1 )1

a

l

so obse

r

ved

significan

!

Ta

bl

e

J

.

Carlx:

n

da

zi

m

so

rption paramelers

for

Frcund\ich

and

L

inea

r

modeJs

with confidence interval.

DifTc

r

enl capllallcnc:

r

s within

cach co

l

urnn denote

significant

difTc:r

ence$

at

p

<

0.05 (

K

ruskal-

W

al1is lIon-parametric tcu)

Kd

Q KO~b

K

f'

Soil

Nor

.

mLg-1 IC95~

r

,

mLg

-!

l~gl-llltg_l

mL

l

I

·

IC95

%

r

,

I

fI,~

IC

95

%

Oxiso\

Ap

26.77

A

23.23-30.31

0

.

974

1

7

1

6

3

4

.5\ A

30

.

20

-

39

.4

5

0.977

0

.

602 A

U

0.5

1

9

-

0.685

AIO

1

5.05

B

C

1

2.62

-

1

7.48

0

.

962

10

24

25

.

88

B

2

1

.

98

-

3

0

.4

1

0.954

0.453

A

0.363-0

.5

42

B

wl

15

.5

1

BO

1

3

.78-

1

7

.2

4

0

.

978

1

567

1

9

.

82

D

17.5

8

-

22.3

4

0

.

976

0.776

B

0

.

677--0

.

875

B

w2

3.66

F

3.4

1

-

3.9

1

0

.

99

1

11

44

1

.8

9 E

1

.17

-

2

.80

0

.

934

1.395 CE

1.092

-

1.698

Entisol

A

3

1.

09 A

28

.73

-

33.45

0

.

993

222\

29

.

[1

A

O

24.39

-

34.83

0

.952

1.165D

0

.

904-

1

.495

CI

13

.00

CE

1

1.4

6--

1

4

.5

4

0

.97

9

178

[

8.07 C

6.95

-

9.40

0

.98

1

1.40

5

C

D

1

.2

30

-

1

.

580

C2

12

.69

DE

11.

73

-

13

.65

0

.

990

2644

8.91 C

7.67-

10

.

35

0

.

975

1.31

7

DE

1.145

-

1.489

(5)

Sorption

in

1\\'0

B

ra:i!i(lII

SQils

,

35

,---,

30 Acellll1liprid

.

"

JJ

~

20

15

~

10

~

a

~

5

2

4

6

6

1

0

12

1

4

16

Cc(~gL·I) 70 60

j

o

,

Dhuon

50

1

°

"

I

30

y

o

,_,!]:J

20

'I

'b ... -

_

.

10 glD

_

<,:

..

.

-o

!§':.

-e

""

-o

2

6

,

10 12

"

O ~-'-~ _ _ _

--l

o

2 " 6 8 10 12 1-1

Ap

AID Bwl 6 13w2

Ap

- - -- - - AIIl - -- - Ilwl - - - Ih .. -2

Fig

.

2

.

L

inea

r

$Orplion

isole

r

ms for

acc

tam

i

prid. earbendazim.

diuro

n and

thiamclhoxam

i

n lhe

horizons

ofOxi$Ol.

co

rrclalion

am

ong

so

rp

l

ioll coe

ffi

cien

l

s

o

f

c

arbcnda

zi

m

and lhe

OC co

nt

e

n\.

l-I

o

wever.

Ih

ey

verified

p

osi

li

ve

co

r

·

r

e

l

:Ll

i

o

n

bC

lw

ec

n

K

J

an

d

K

"

with

soi

l

cl

"

y cont

ent. a r:L

c

l

Ih

a

l

wa

s

nOI

obse

r

ved in

our

s

lu

dy.

Th

e

K

d

and K

J

\

'

al

u

e

s

for

diur

o

n

s

how

c

d

sig

nifi

c:

ml

Cp =

0.05) dilTerence

am

o

n

g

lh

e

I

WO

soi

l

h

o

rizon

s.

excep

ll

o

K

J

va

lu

es in

lhe

Ox

iso

l

A

/

I)

horizon a

n

d E

n

t

i

so

l

CI ho

r

i

zo

n

.

Sor

pli

on

o

f

di

ur

o

n

was

lar

ge

r

i

n

l

h

e

A

p

h

o

ri

zon

o

ft

he

O

iso

l

.

bcing

lhe

o

ppo

s

i

l

e

o

b

se

r

ve

d

in

lh

e

Enl

iso

l

(

Ta

b

l

e

4

).

Thc

K

...,

va

lue

s

oflhedi

ur

o

n

rang

ed

f

TO

m 14

5

1

0263

1

m

L

g

-

l

OC

(m

ean

,

968)

,

indiclLting inler

m

edia

r

y

mobi[it

y.

Si

m

·

ilar

r

es

ults

were

f

o

und

by

S

o

u

z

a

ct

al.

[

J4

1

an

d C;

lra

cc

i

o

l

o

el

aJ.,l

JO

l

while

L

iy

"na

ge e

l

al.I1S1 and

Oli

ve

r

el a

l

.

[

121

o

b

sc

r

ved

l

owc

r

v

alue

s o

rK

oc.

v

a

r

ying

fr

o

m

55

l

o 962

mL

&

-

1

(

m

ean.

40

7)

and 225

t

o

1

1

79

m

L

g

-

l (

m

e

an

of

599),

respec

l

ively

.

N

o co

rr

e

l

a

t

io

n

be

lw

een

K

,

and

va

lu

es

w

ilh

soi

l

ato

Iri

b

ut

es

we

re

observed,

while

Koc

s

howed

posi

l

ive

co

rr

eia·

li

o

n

(

r

2

=

0

.8

97

;

p

=

0

.

006) wi

l

h

day/Oe

rat

io

.

Th

is

re

s

u

lt

dive

r

ges

fr

o

m theolle

obse

rved

b

y

SOUZ.I

el

a1.[l4]

who

f

o

und

po

s

itivc

co

rr

clal

io

n

of

K

J

and

K

oc

o

n[y

wi

lh

o

r

ga

ni

cca

r

bo

n

o

r

an U

lt

iso1.

A

cc

ordin

g

10

Kari

c

kh

o

W

361

f

or

a

m

inera

l

/

o

r

ga

ni

c c

arb

o

n ra

t

i

o o

f

l

ess

Ihan

30,

mineT<

11

conlrib

u

l

ions

f

or

so

rp

t

ion c

an

be

re

duced

,

de

s

pite

d

a

y

con

tent

o

probabl

y

duc

1

0

m

inera

l bl

oc

ka

ge by

th

e

o

rganic

man

er.

!l11

T

he

ge

ncr:ll

ij'.a

ti

o

n Ihal

lL

ppcar

s

in lhe

l

i

t

era

lur

e

i

s

Ihat

lhe

m

OS

I

i

mp

o

rlanl

so

i

l

propcrl

y

alT

t."C

t

i

n

g

sorp

t

ion

o

f

pes·

li

ci

de

s

is

l

h

e

OC

co

nlent.

No

n

·

h

y

dr

o

ph

ob

i

c

i

n

t

c

ra

c

t

ions.

n

ever

l

h

e

le

ss.

clln co

ntr

ib

ule

1

0

lhe

so

rpl

io

n

u

nd

e

r

some

co

n

dilions.

Th

i

s

appears

l

o occ

ur

wi

lh highl

y

polar

o

r

ion

·

izab[e

co

mp

ou

n

ds a

nd i

s

m

ore a

pparcnl f

or

soils wi

th

l

ow

OC

and

h

ig

h

da

y

con

l

enl

pa)

T

hc

m

cch

íl

nis

m

s

i

n

volved i

n

l

h

e so

rpti

on af

pe

s

t

icides

10

o

r

g

ani

c

lIlíl

tt

er

h

ave

n

o

l

bcc

n

d

ea

rl

y

demons

lral

ed. S

o

i!

o

rg

;tn

i

c ma

lt

e

r

is

a co

mp[

ex

and

hC

l

c

r

ogc

nc

o

us

m

ixl

urc

o

f

h

u

mi

c s

ub

s

lances. pol

ys

accha

ri

d

cs,

l

ig

n

in.

si

m

p

ie

c

arb

o

h

dra

t

es.

l

i

pid

s.

p

r

o

t

ci

n

s

and

o

rgan

ic

acids.

a

nd can be

a

ssoei·

a

l

cd

t

o

a

l

umin

um·

si

l

icat

e

s,

a

l

uminum

and i

r

o

n

hydroxide.

and

ot

h

e

r

inorganic

co

mp

o

und

s

in

soi

l

.

[

2

7.38.

39

1

I-I

ence. nO

I

o

n

l

y

lhe

org

ani

c

maller

c

onlem

b

UI

a

l

so i

l

s co

mp

osi

l

ion

i

nfl

ue

n

ces so

r

p

t

ion

.

Th

c

Ih

ia

m

e

t

h

oxam

so

r

pt

ion (

Ta

b

l

c 5

)

i

n

lh

e

Ox

iso

[

wa

s

vari

a

b

l

c. wi

lh

si

milar

v

alue

s

in

A

/

U

an

d

Bw2

h

o

ri

ZO

Il

S.

H

owc"c

r

. in

I

hc

Enl

iso

[

K

d

and

K

J

s

h

owe

d

signi

ficanl

di

]"

·

rer

ence

(

p

<

0

.

05)

belwcen

Ap

.

e

l

and e2

hor

izons.

No

Referências

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