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| 沘江水体重金属污染的沿程变化特征 | |
| 引用本文： | 易琦,窦小东,赵筱青,黄茜蕊.沘江水体重金属污染的沿程变化特征[J].安徽农业科学,2013,41(15):6848-6852. |
| 作者姓名： | 易琦 窦小东 赵筱青 黄茜蕊 |
| 作者单位： | 1. 云南大学喀斯特国际联合研究中心,云南昆明650091;云南大学资源环境与地球科学学院,云南昆明650091 2. 云南省气象局,云南昆明,650034 3. 云南省国土资源职业学院环境地质系,云南昆明,650217 |
| 基金项目： | 云南省应用基础研究面上项目 |
| 摘 要： | 为研究沘江水体重金属污染现状及其沿程迁移变化特征与动力因素,于2010年1月在金顶铅锌矿区上、下游共采集了25个水样和底泥样,运用单因子评价法和内梅罗综合指数法评价了水体污染程度。结果表明,枯水期矿区下游水质均为地表水Ⅲ类,但其受重金属的污染仍较严重,治理难度很大,少量重金属污染物已扩散进入澜沧江干流。究其原因,发现金顶矿区是沘江水体重金属的根本污染源。通过分析水体中Zn、Pb和As浓度沿河程的变化态势,发现随与矿区距离的增加,其下游水体重金属含量趋于降低,降速趋于减缓;但因在水体-底泥间迁移转化特性方面的差异,水体中Zn、Pb和As浓度的沿程减少过程不尽相同。在此过程中,河道上的拦河坝对Zn和Pb的迁移转化过程干扰大,对As则不显。此外,流域内潜在的其他污染源引起了局部河段水体中Pb、尤其是As浓度的异常变化。 |
| 关 键 词： | 沘江 重金属污染 单因子评价 内梅罗综合指数 吸附-解吸平衡 |
Variation Characteristics of Heavy Metal Pollution in Water Body along The Bijiang River |
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| Institution: | YI Qi et al(Yunnan University International Joint Research Center for Karstology,Kunming,Yunnan 650091) |
| Abstract: | In order to study heavy metal pollution situation and its variation characteristics and dynamic factors along the Bijiang River,totally 25 samples of water and sediment in upstream and downstream of the Jinding lead-zinc mining area were collected in January 2010.By using single-factor evaluation method and Nemerow index method,the degree of water pollution was evaluated.The results showed that the downstream water quality of the mining area in the dry season belongs to the III class of surface water.However,for the serious contamination by heavy metals,governance is very difficult,and a small amount of heavy metal pollutants have spread into the Lancang River.The curve chart derived from data analyzing presents the change trends of Zn,Pb and As in water along the river,and it was discovered that Jinding mining area is the fundamental source of heavy metal pollution of Bijiang River,and with the increase of distance away from the mining area,the concentration of heavy metals in water decreased when their descent rates tended to slow down;while,as the differences of migration and transfer properties between water and sediment,there were differences among the decline process of Zn,Pb and As.Meanwhile,the barrages on the river have more influence on migration and transfer of Zn and Pb,but As seems unaffected.Furthermore,some other potential pollution sources in the basin caused abnormal concentration changes of Pb,especially As in some parts of the river. |
| Keywords: | Bijiang River Heavy metal pollutants Single-factor evaluation Nemerow pollution index Adsorption-desorption balance |
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