中国南方稻田土壤汞含量及潜在危害评价

发布时间：2019-06-13 09:55

【摘要】：选择我国南方水稻主产区安徽、浙江、湖南、湖北以及广西5个省,采集213个稻田土壤样品,探究我国南方稻田土壤中汞的空间分布特征与土壤理化参数(如p H值和有机质)的相关关系及汞富集的潜在危害。结果表明:不同省份的稻田土壤汞含量存在显著的差异(P0.05,n=213),含量范围是0.029~0.326 mg·kg~(-1)(干重),平均值为(0.094±0.036)mg·kg~(-1),与农用地土壤环境质量标准0.30 mg·kg~(-1)(GB15618—1995)相比,除湖北省以外均有轻度汞污染。Pearson相关性分析表明,稻田土壤中的汞含量与有机质含量呈显著正相关关系(P0.01,r=0.445),说明适度偏高的有机质有利于土壤汞的富集。不同省份稻田土壤潜在危害等级除浙江省外均在轻微到中等的范围内,浙江省的为强等级。
[Abstract]:The soil samples of 213 paddy fields were collected from 5 provinces of Anhui, Zhejiang, Hunan, Hubei and Guangxi. The relationship between the spatial distribution of the mercury and the physical and chemical parameters of the soil (such as the value of p H and the organic matter) and the potential hazards of the mercury enrichment were explored. The results showed that there was a significant difference in the content of mercury in the paddy field in different provinces (P0.05, n = 213), the content range was 0.029 ~ 0.326 mg 路 kg ~ (-1) (dry weight), the average value was (0.094-0.036) mg 路 kg ~ (-1), and the soil environmental quality standard of the agricultural land was 0.30 mg 路 kg ~ (-1) (GB15618-1995). In addition to Hubei province, there are mild mercury pollution. Pearson correlation analysis showed that the content of mercury in the soil of rice field was positively correlated with the content of organic matter (P0.01, r = 0.445), indicating that the moderately high organic matter is beneficial to the enrichment of soil mercury. The potential hazard level of the soil in the paddy field in different provinces, except Zhejiang Province, is slightly to the middle, and Zhejiang is a strong grade.
【作者单位】：贵州师范大学化学与材料科学学院;中国科学院地球化学研究所环境地球化学国家重点实验室;
【基金】：973项目(2013CB430004) 国家自然科学基金项目(41273099)
【分类号】：X825

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