污灌区盐分累积对污染土壤汞释放通量的影响

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Abstract This research was design to study the effects of salinity on mercury release from soils.Atmospheric mercury (Hg) was measured by using the optimized dynamic flux chamber to monitor the air/soil exchange of mercury from soils spiked with NaCl and Na₂SO₄ at 0~5% level,respectively.The results manifested that,compared with the control soil (no exogenous salt spiked),soil Hg emission flux showed a rising trend with the increase of NaCl salinity level which the Hg flux increased by 48.94% at the 5% salinity treatments,while soil Hg flux showed a decline trend with the increase of Na₂SO₄ salinity level which the Hg flux decreased 20.62% at the 5% salinity treatments.Furthermore,there was a linear relationship between the soil salt content and the mean soil Hg emission flux.The model between the content of x(g/kg) and the Hg flux of y [ng/(m²·h)]is y=0.8258x + 86.709(R²=0.9734) for NaCl,and the model is y=-0.3354x + 85.997(R²=0.9581) for Na₂SO₄.The results illustrate that soil Hg emission flux can significantly affected by NaCl with high concentration.The trend of salinization of soil will lead to more serious risk of Hg emission and crop absorption.

Key words： soil mercury salt emission flux

Received: 04 August 2017

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	Articles by authors
	ZHENG Shun-an
	XI Bin
	WU Ze-ying
	ZHOU Wei
	HUANG hong-kun
	ZHENG Xiang-qun

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ZHENG Shun-an,XI Bin,WU Ze-ying等. A simulation study of mercury release fluxes from soils under different salinity levels in the wastewater-irrigated area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2018, 38(3): 1047-1053.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2018/V38/I3/1047

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