Simultaneous determination of arsenic(V) and arsenic(III) in water by inductively 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
✍ Scribed by Yong-lai Feng; Jian-ping Cao
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 595 KB
- Volume
- 293
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
A small co-centric hydride generator can be used to determine arsenic by inductively coupled plasma atomic emission spectrometry with a minitorch of 0.65 kW power. Because the reaction of arsenic(V) with L-cysteine is linearly dependent on time up to 9 mitt, the determination of arsenic(V) based on reduction kinetics is possible. Interferences from transition elements are low. The detection limit for arsenic(V) is 3.4 ng ml-' and for arsenidIII) 0.7 ng ml-l. The relative standard deviation for ten determinations of solutions containing 100 ng ml-' As(V) was 1.45% and for a solution containing 100 ng ml -' As(III) it is 1.21%. A major advantage of this system is the simultaneous determination of arsenic(V) and arsenidII1) under conditions of low acid and low power using a normal spray chamber.