固相萃取—ICP-MS分析西藏咸水湖泊中的微量元素

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Abstract A novel method was developed using a NOBIAS PA1 chelating resin with an inductively coupled plasma mass spectrometry (ICP-MS) measurement for Mn, Fe, Co, Ni, Cu, and Zn in organic-rich saline lakes. First, H₂O₂ was added to the samples which were subsequently irradiated with a digester containing three low-pressure ultraviolet lamps. This UV/H₂O₂ method could destroy the organic ligands of Co and Cu in water to reduce their interference. Then, the trace metals were pre-concentrated through a chelating resin column. The column was rinsed with an NH₄AC solution to remove the loaded salts. Finaly, the trace metals were eluted with HNO₃ solution and analyzed by ICP-MS. Results showed that the procedural blanks and detection limits of the trace elements were 0.49~6.43 ng/kg and 0.17~4.55 ng/kg, respectively, at a pH of 6.35 ±0.30. All trace metals were quantitative, and their recovery rates were 99%~102%. The results from the application of this method to Yagen Co Lake, Selin Co Lake, and Angren Jin Co Lake in Tibet showed that the recovery rates of Indium internal standard were >99%, and the relative standard deviations of the samples (n =3) were less than 5%. These findings suggests the method developed in this paper could be used to analyze trace metals in inland lakes, especially in organic-rich saline lakes (including salt lakes).

Key words： NOBIAS PA1 UV/H₂O₂ ICP-MS trace elements saline lake

Received: 03 September 2020

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X524

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	YANG Xin-xin
	ZHU Zhao-zhou
	HE Hui-jun
	ZHANG Jing
	LIU Xiao-long

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YANG Xin-xin,ZHU Zhao-zhou,HE Hui-jun等. Determination of trace elements in saline lakes in Tibet by ICP-MS after the solid-phase extraction[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(4): 1732-1736.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I4/1732

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