“…Further increase in the pH from 9.0 resulted in a significant decrease in the recovery because the Cu (II) ions are easily complexed by ammonium, restraining their precipitation. It is also observed that the values of pH that they had resulted in bigger efficiencies of copper recovery are in agreement with the values favorable to the formation of the complex Cu-Me-BTAP (Lemos et al 2006a). Thus an acetate buffer with pH 6.0 was selected for further work.…”
A simple and sensitive method was developed for determination of trace copper by direct precipitation preconcentration and detection with Flame Atomic Absorption Spectrometry (FAAS). The reagent 2-[2'-(6-methyl-benzothiazolylazo)]-4-aminophenol (Me-BTAP) was used as precipitating agent. The experimental conditions for the quantitative precipitation of copper, such as pH, amount of reagents, temperature and the effect of diverse ions on the precipitation have been investigated. It was found that copper is quantitatively extracted (> or =95%) and the method provides a sensitivity enhancement of 40-fold for a 10 ml sample volume with a detection limit of 0.5 microg l(-1). The proposed method was successfully applied for the determination of trace copper in water, urine and biological samples.
“…Further increase in the pH from 9.0 resulted in a significant decrease in the recovery because the Cu (II) ions are easily complexed by ammonium, restraining their precipitation. It is also observed that the values of pH that they had resulted in bigger efficiencies of copper recovery are in agreement with the values favorable to the formation of the complex Cu-Me-BTAP (Lemos et al 2006a). Thus an acetate buffer with pH 6.0 was selected for further work.…”
A simple and sensitive method was developed for determination of trace copper by direct precipitation preconcentration and detection with Flame Atomic Absorption Spectrometry (FAAS). The reagent 2-[2'-(6-methyl-benzothiazolylazo)]-4-aminophenol (Me-BTAP) was used as precipitating agent. The experimental conditions for the quantitative precipitation of copper, such as pH, amount of reagents, temperature and the effect of diverse ions on the precipitation have been investigated. It was found that copper is quantitatively extracted (> or =95%) and the method provides a sensitivity enhancement of 40-fold for a 10 ml sample volume with a detection limit of 0.5 microg l(-1). The proposed method was successfully applied for the determination of trace copper in water, urine and biological samples.
“…The comparison of proposed method with other solid phase extraction methods is summarized in Table 8. The preconcentration factor of proposed solid phase extraction method was generally high than some literature [18,[32][33][34][35][36][37][38][39].…”
“…Flow injection (FI) separation/preconcentration systems, which use a mini-column packed with a solid support loaded or functionalized with complexing reagents, has been much used to increase sensitivity and selectivity in the analytical determination of trace metals [17,18]. FI preconcentration procedures offer some very favorable features in relation to batch methods, because they comprise a cheap, versatile, and easy operation system that improves the analytical frequency and reproducibility.…”
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