基于筛分水平浓度法的洞庭湖沉积物质量基准初步分析

发布时间：2018-04-24 23:30

本文选题：洞庭湖 + 重金属　；参考：《湖泊科学》2017年01期

【摘要】：基于2013 2015年调查获取的129个洞庭湖表层沉积物和底栖生物的调查数据,应用筛分水平浓度法初步探讨了洞庭湖沉积物几种重金属沉积物质量基准的推荐值.结果表明,洞庭湖沉积物砷(As)、镉(Cd)、铬(Cr)、铜(Cu)、铅(Pb)和锌(Zn)含量均值为17.2、2.63、56.9、32.4、38.4和96.3 mg/kg(DW);筛分水平浓度法获取的洞庭湖沉积物As、Cd、Cr、Cu、Pb和Zn质量基准分别为11.97、1.13、42.03、19.17、23.63和67.54 mg/kg(DW).通过与不同国家及地区指定的重金属质量基准推荐值以及本地区采用其他方法推导的重金属基准推荐值进行比较,推算出本研究获取的6种重金属沉积物质量基准推荐值接近所有数据的中间值.对于洞庭湖流域,不同方法获取的沉积物重金属质量基准具有可比性.然而,鉴于用于推导沉积物质量基准的数据采集涉及的区域较为有限,且除了重金属污染外,影响底栖生物分布的因素较为复杂,导致获取的沉积物重金属质量基准推荐值存在一定的不确定性.
[Abstract]:Based on 129 survey data of surface sediments and benthos collected in Dongting Lake in 2013 and 2015, the recommended values of several heavy metal sediment quality criteria in Dongting Lake sediments were preliminarily discussed by sieving horizontal concentration method. The results showed that the average contents of arsenic, CD, Cr, Cu, Pb, Pb and Zn in sediments of Dongting Lake were 17.2 ~ 2.63 ~ 56.9g / kg ~ (38.4) and 96.3 mg 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1) ~ (-1) C ~ (2 +) C ~ (2 +), respectively, and the results showed that the mass standard of As-CdCr-Cr-CuPb and Zn in sediments of Dongting Lake were 11.97 ~ 1.1342.03n 19.1723.63 and 67.54 mg / kg 路kg 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1) 路kg ~ (-1) C ~ (-1), respectively. By comparing them with the recommended values of heavy metal quality benchmarks specified by different countries and regions and those derived from other methods in their respective regions, It is deduced that the recommended values of six heavy metals sediment quality datum obtained in this study are close to the intermediate values of all the data. For Dongting Lake basin, the sediment heavy metal quality standards obtained by different methods are comparable. However, given that the data collection used to derive sediment quality baselines involves only a limited number of areas and that, in addition to heavy metal pollution, the factors affecting the distribution of benthos are more complex, There is some uncertainty about the recommended value of sediment heavy metal quality standard.
【作者单位】：中国环境科学研究院环境基准与风险评估国家重点实验室;洞庭湖生态环境监测中心;
【基金】：国家重点基础研究发展计划项目(2012CB417004) 国务院三峡办洞庭湖江湖生态监测项目(JJ[2015]-002)联合资助
【分类号】：X522

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