Determination of Trace Selenium in Groundwater by DRC-ICP-MS

Jin-wei LIU; Xue-song LIU; Chao BIAN; Tao ZHANG; Zhi-yin ZHANG; Jian-peng WEI

doi:10.15898/j.cnki.11-2131/td.201804200049

2019 Vol. 38, No. 1

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Jin-wei LIU, Xue-song LIU, Chao BIAN, Tao ZHANG, Zhi-yin ZHANG, Jian-peng WEI. Determination of Trace Selenium in Groundwater by DRC-ICP-MS[J]. Rock and Mineral Analysis, 2019, 38(1): 85-91. doi: 10.15898/j.cnki.11-2131/td.201804200049

Citation:

Jin-wei LIU, Xue-song LIU, Chao BIAN, Tao ZHANG, Zhi-yin ZHANG, Jian-peng WEI. Determination of Trace Selenium in Groundwater by DRC-ICP-MS[J]. Rock and Mineral Analysis, 2019, 38(1): 85-91. doi: 10.15898/j.cnki.11-2131/td.201804200049

Determination of Trace Selenium in Groundwater by DRC-ICP-MS

Center of Hydrogeology and Environmental Geology, China Geological Survey, Baoding 071051, China

Received Date: 20 April 2018

Revised Date: 16 July 2018

Accepted Date: 10 August 2018

Abstract

Abstract

BACKGROUNDGenerally, the content of Se in groundwater is lower than 1μg/L. Mass interferences caused by polyatomic species and low ionization degree can seriously affect the accuracy for determination of trace and ultratrace Se in groundwater by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). Moreover, the current detection limit is higher than required for practical purposes. OBJECTIVESTo establish DRC-ICP-MS method for determination of trace selenium in groundwater. METHODSEthanol was used as a signal enhancer, methane was used as a reaction gas. The factors that affect different mass determination, including methane flow, ethanol content, atomizing gas flow rate, low mass interception (RPq), RF generator (Rf) power, ion residence time were discussed and optimized. RESULTSEthanol can increase response values, whereas ethanol and methane can obviously eliminate the mass spectrometry interference. Under the optimized conditions, except ⁷⁴Se, calibration curves show a good relationship (R > 0.9996). The method detection limits are 0.02-0.03μg/L, the relative standard deviation (RSD, n=5) is lower than 2%, and the average spiked recovery is 95.7%. CONCLUSIONSThe method has simple pretreatment and single equipment, which can meet the requirements for determination of trace selenium in large quantities of groundwater.
- groundwater /
- trace Se /
- dynamic reaction cell /
- Inductively Coupled Plasma-Mass Spectrometry /
- ethanol /
- methane

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References

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