[PDF] Top 20 Eclet. Quím. vol.35 número1

... mAtHemAtiCAL equAtion CorreCtion to SPeCtrAL AnD trAnSPort interFerenCeS in HigH-reSoLution Continuum SourCe FLAme AtomiC ABSorPtion SPeCtrometrY: DeterminAtion oF LeAD in PHoSPHoriC[r] ... See full document

... Chromatographic proiles (HPLC) of aqueous ( A ) and hydroalcoholic ( B ) extracts of Alpinia zerumbet obtained by ultrasonic extraction: rutin ( 1 , RT 31.42 min) and kaempf[r] ... See full document

... Abstract: A qualitative spot-test and tandem quantitative analysis of dipyrone in the bulk drug and in pharmaceutical preparations is proposed. The formation of a reddish-viol[r] ... See full document

... In Figure 2 shows the inluence of the ethanol percentage of the methanol/ethanol blends on the ester content and the mass yield of pure biodiesel, for a ixed reaction time of 30 min.. F[r] ... See full document

... The stoichiometry of the ion-pair complex formed between the dug and dye (1:1) was determined by Job’s continuous variations method and the stability constant of the complex[r] ... See full document

... As a continuation of our studies on chloro- phenoxyacetates and also on carboxylates [10,18- 30] we decided to synthesized 4-chlorophenoxy- acetates with Nd(III), Gd(III) and H[r] ... See full document

... The present study focused on assessment of hydrochemical quality of ground water samples collected from wells located in three district of Sana’a secretariat, to compare t[r] ... See full document

... N-methylpyrrolidione is used in series of processes such as degassing, distillation, and solvent regeneration in rubber manufacturing as solvent for the extraction of 1,3-butadiene[r] ... See full document

... In this work, the photo-Fenton process was studied for the treatment of aqueous wastes con- taining formaldehyde generated in a biological laboratory of the Bioscience [r] ... See full document

... Although some remarks had being described concerning to the determination of pyridoxine by potentiometric titration according to the European Pharmacopoeia 4.0 (2002) [1[r] ... See full document

... ESTIMATION OF STANDARD ENTHALPY OF FORMATION OF ALKANES IN GASEOUS STATE BY CALCULATING SIZE, STRUCTURAL AND ELECTRONIC.. PARAMETERS IN THE MOLECULES.[r] ... See full document

... Quando um pro- cesso endotérmico ocorre num sistema (local onde se realiza o processo em estudo como célula ou vaso calorimétrico) com fronteiras (região entre o siste[r] ... See full document

... The proposed methods are checked by a thorough analysis of each spiked sample and the results are compiled in table 3 .The accuracy and reliability of the proposed method are fur- the[r] ... See full document

... Dessa forma, entre os quatro modelos desenvolvidos, os modelos b e d apresentaram os melhores resultados; maior concordância entre valor real e predito (menores valores [r] ... See full document

... Perfi l espacial-temporal da concentração de fósforo total (FT) nas águas do Rio São Francisco Falso, braços norte e sul, Tributário do Reservatório de Itaipu, Paraná.. Tabela 2..[r] ... See full document

... Functions devel- oped by Gran in 1952 for the carbonate system of low ionic strength natural waters (ionic strength less than 0,1) allow to obtain with great accuracy the volu[r] ... See full document

... BOUND STATE SOLUTIONS OF SCHRÖDINGER EQUATION FOR A MORE GENERAL EXPONENTIAL SCREENED COULOMB POTENTIAL VIA NIKIFOROV-.. UVAROV METHOD.[r] ... See full document

... As a continuation of our studies on carbo- xylates we decided to synthesize 2-methoxyphe- noxyacetates with Mn(II), Co(II), Ni(II) and Cu(II) and to study some of their proper[r] ... See full document

... Considerando o bom rendimento da transeste- rificação alcalina etílica do óleo de milho, foi escolhida a amostra obtida através do ensaio 10 (Tabela 4), com as seguintes variáveis de processo: tempo, 60 minutos; ... See full document

... Neste trabalho, pretendeu-se caracterizar fi sico-quimicamente ácidos húmicos extraídos ao longo do processo de vermicompostagem, sendo feita inicialmente a extração dos ácidos a part[r] ... See full document