Journal
ANALYTICAL CHEMISTRY
Volume 89, Issue 17, Pages 8678-8682Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.7b02635
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- Jinan University Guangzhou, China
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Hydride generation (HG) is an effective technique that eliminates interfering matrix species and enables hydride separation. Arsenic speciation analysis can be fulfilled by cryogenic trapping (CT) based on boiling points of resulting arsines using liquid nitrogen (LN2) as a coolant. In this work, LN2 was replaced by the thermoelectric effect using a cryogenic trap that consisted of a polytetrafluoroethylene (PTFE) body sandwiched by two Peltier modules. After the trap was precooled, the arsines flew along a zigzag channel in the body and reached a sorbent bed of 0.2 g of 15% OV-3 on Chromosorb W-AW-DMCS imbedded near the exit of the trap. CH3AsH2 and (CH3)(2)AsH were trapped, while AsH3, that passed the trap unaffected, was detected by atomic fluorescence spectrometry. Continuous operation led to enhanced throughput. For inorganic As, the limit of detection (LOD) was 1.1 ng/g and recovery was 101.0 +/- 1.1%. Monomethylarsonic acid and dimethylarsinic acid did not interfere with 0.2 +/- 1.2% and 0.3 +/- 0.5% recoveries, respectively.
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