铅同位素示踪在大气降尘重金属污染来源解析中的应用

doi:10.13278/j.cnki.jjuese.201605208

Abstract

Abstract:

In order to identify the sources of lead pollution in the atmospheric dustfall, as well as comfirm the contribution of each source to such pollution. We obtained 29 atmospheric dustfall samples in the different areas of Xiamen City. Total Pb isotopic composition of each sample was analyzed by thermal mass spectrometry and acid soluble Pb isotopic ratios were determined by ICP-MS. The results indicated that dustfall Pb isotope of ²⁰⁶Pb/²⁰⁷Pb in Xiamen City varied widely with the ranges of 1.111 9 to 1.173 8.Pb isotope of ²⁰⁶Pb/²⁰⁷Pb in acid solution was different from the ratios in residual form soil of Fujian, indicating the powerful impact of external lead sources. Pb isotopic composition of acid solution decreased significantly than total Pb isotopic composition. Lead isotope tracing techniques showed coal-fired was the main source of lead pollution in Xiamen City dustfall, followed by nature source and vehicle exhaust. Total and acid soluble Pb isotope composition of coal pile was closed to coal-fired, suggesting coal pile was a potential source. The results of ternary hybrid model were as follows: the contribution of coal-fired, nature source and vehicle exhaust to total lead in dustfall were 48.57%, 20.29% and 31.14%, respectively.

Key words: dustfall, lead isotopic, source apportionment, Xiamen City

CLC Number:

X823

Hu Gongren, Yu Ruilian, Hu Qichao, Wen Xianhua, Liu Xianrong, Zhang Xilin. Tracing Heavy Metal Sources in the Atmospheric Dustfall Using Stable Lead Isotope[J].Journal of Jilin University(Earth Science Edition), 2016, 46(5): 1520-1526.

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