SIMULTANEOUS DETERMINATION OF ARSENIC(V) AND ARSENIC(III) IN WATER BYINDUCTIVELY-COUPLED PLASMA-ATOMIC EMISSION-SPECTROMETRY USING REDUCTION OF ARSENIC(V) BY L-CYSTEINE AND A SMALL CO-CENTRIC HYDRIDE GENERATOR WITHOUT A GAS-LIQUID SEPARATOR
Yl. Feng et Jp. Cao, SIMULTANEOUS DETERMINATION OF ARSENIC(V) AND ARSENIC(III) IN WATER BYINDUCTIVELY-COUPLED PLASMA-ATOMIC EMISSION-SPECTROMETRY USING REDUCTION OF ARSENIC(V) BY L-CYSTEINE AND A SMALL CO-CENTRIC HYDRIDE GENERATOR WITHOUT A GAS-LIQUID SEPARATOR, Analytica chimica acta, 293(1-2), 1994, pp. 211-218
A small co-centric hydride generator can be used to determine arsenic
by inductively coupled plasma atomic emission spectrometry with a mini
torch of 0.65 kW power. Because the reaction of arsenic(V) with L-cyst
eine is linearly dependent on time up to 9 min, the determination of a
rsenic(V) based on reduction kinetics is possible. Interferences from
transition elements are low. The detection limit for arsenic(V) is 3.4
ng ml(-1) and for arsenic(III) 0.7 ng ml(-1). The relative standard d
eviation for ten determinations of solutions containing 100 ng ml(-1)
As(V) was 1.45% and for a solution containing 100 ng ml(-1) As(III) it
is 1.21%. A major advantage of this system is the simultaneous determ
ination of arsenic(V) and arsenic(III) under conditions of low acid an
d low power using a normal spray chamber.