Determination of bioavailable soluble arsenic and phosphates in mine tailings by spectrophotometric Sequential Injection Analysis
Por:
Cordero, BER, Canizares-Macias, MR
Publicada:
15 may 2009
Categoría:
Chemistry (miscellaneous)
Resumen:
By using a simple Sequential injection Analysis (SIA) manifold and in base to the kinetic reaction of the molybdenum with As(V) and P(V) was possible to determine As(III), As(V) and P(V) in simple, binary and ternary samples. The activation energies for the reaction between molybdenum and As(V) and P(V) were of 70.90 kJ mol(-1) and of 19.02 kJ mol(-1), respectively, therefore it was possible to determine both analytes in mixtures by using different reaction temperature. When the analyses were carried out at room temperature, only the P(V) supplied analytical signal; with increased temperature, the kinetics of reaction for As(V) also increased, and a signal was obtained, being 55 degrees C the optimum temperature. In order to determine As(III), it was oxidized into As(V) with KIO(3), and the reaction was carried out in the same way as for As(V). To resolve mixtures,an equations system from six calibration curves with different sequences of SIA at different temperature was performed. The
Filiaciones:
Cordero, BER:
Univ Nacl Autonoma Mexico, Fac Quim, Dept Quim Analit, Mexico City 04510, DF, Mexico
Canizares-Macias, MR:
Univ Nacl Autonoma Mexico, Fac Quim, Dept Quim Analit, Mexico City 04510, DF, Mexico
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