2011—2013年广西农田土壤镉含量调查

黎勇; 钟格梅; 黄江平; 韦日荣; 李裕利

2011—2013年广西农田土壤镉含量调查

Survey on Soil Cadmium Content in Guangxi Provinces in 2011-2013

摘要

摘要:
目的了解农田重金属镉的污染状况, 为制订相关防制措施提供依据和支持。
方法于2011-2013年对全区29个县(区)的580个行政村设立农田土壤监测点进行采样, 利用电感耦合等离子体质谱法(ICP-MS)对土壤镉的含量进行检测。
结果 2011-2013年共采集农田土壤1 740份, 29.83%的土壤镉含量低于自然背景值; 镉检测结果范围为:0.022~91.5 mg/kg, 算术平均值为0.86 mg/kg, 中位数为0.32 mg/kg, 标准差是3.47;镉的点位超标率为49.94%, 重度污染比例为18.18%、中度污染比例为14.73%、轻度污染比例为20.25%、轻微污染比例为46.84%。
结论农田镉超标率维持在一个较高水平。应进一步开展土壤污染状况详细调查, 加强对重点地区的人群健康监测, 找出人群健康效应关系。

Abstract:
Objectives To understand the pollution of cadmium in soil, in order to provide evidence and support for Guangxi government to formulate prevention measures.
Methods Soil samples were collected from the farmland in 580 administrative villages of 29 counties (districts) in 2011-2013, and the content of cadmium was detected by inductively coupled plasma mass spectrometry (icp-ms).
Results The cadmium content in 1740 soil samples were in the range of 0.022~91.5 mg/kg, with an average value of 0.86 mg/kg, a median value of 0.32 mg/kg, a standard deviation of 3.47, and only 29.83% of the values were lower than the natural background (0.2 mg/kg). The exceeding rate of cadmium in soil samples was 49.94%;and the degree of pollution in polluted points were 18.18% in severe level, 14.73% in moderate level, 20.25% in light level and 46.84%in slight level.
Conclusions With a higher exceeding rate of cadmium pollution in soil, more detailed investigation in key areas should be carried out to identify the relationship between cadmium pollution and people's health.

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