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J. Braz. Chem. Soc. vol.25 número4

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Figure 2. Effect of pH on the absorbance of iron and copper. Conditions:
Figure 4. Effect of salt on the absorbance of iron and copper. Conditions:
Table 1. Effect of coexisting ions on the extraction of 0.5 µg mL -1 Fe(III) and 0.5 µg mL -1 Cu(II) Coexisting ions Maximum tolerable limit / (mg L -1 ) Na + , K + 5000 Cl – 3500 Mg 2+ , Ba 2+ , ClO 4 – , Br – , Ca 2+ , oxalate 1500 Urea 1000 Sr 2+ ,
Table 4. Application of the proposed method for analysis of vegetable and fruit samples (n = 3 and three samples for each type of fruit and vegetable were analyzed)
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