Continuous Arsine Detection Using a Peltier-Effect Cryogenic Trap To Selectively Trap Methylated Arsines

文献类型： 外文期刊

第一作者： Chen, Guoying

作者： Chen, Guoying;Lai, Bunhong;Mao, Xuefei;Chen, Tuanwei;Chen, Miaomiao

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期刊名称：ANALYTICAL CHEMISTRY （ 影响因子：6.986； 五年影响因子：6.755 ）

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收录情况： SCI

摘要： 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.

分类号： O65

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