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| 湘江(株洲段)沉积物重金属污染现状及生态风险评价 |
| Evaluation ofPollution Situation and EcologicalRisk forHeavyM etalsin SedimentofXiangjiang River(Zhuzhou Section) |
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| 基金项目:特殊类型河流污染防治与水质改善关键技术研究与示范基金资助项目 (2008ZX07212- 001- 06) |
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| 中文摘要: |
| 采集湘江 (株洲段)9 个断面的底泥样品, 和1个柱状样品, 对重金属 (Cu、Pb、Zn、Cd、Ni、Cr、 H g、A s) 含量进行了检测 ; 并运用地质积累指数法对底泥中重金属进行了生态风险评价。结果表明, 该江段底泥已受到较严重的重金属污染 ,在霞湾断面达峰值。Cu、Pb、Zn、Cd含量为湘江背景值4.6倍 ~ 58.8 倍, 比该江段20世纪80年代均值增高1.71倍 ~1.96倍; 地质积累指数评价结果表明, 该江段未受到Ni、 Cr 的污染 ;Cd的污染比其他重金属的污染要严重, 污染级别为强 - 极强、极强; 重金属的垂直分布表明: 大体上,各重金属元素最高值出现在深度0 cm ~ 50 cm, 随深度的变化Ni、Cr的含量变化不大。 |
| 英文摘要: |
| Heavy metals(Cu, Pb, Zn, Cd, N,i Cr, H g, As) were detected inthesamples which were collectedin ninecrosssectionsandoneverticalsection atXiangjiangRiverofZhuzhou. Ecologicalriskwaseval uated byindexofgeoaccumulationmethod. Theresultsshowedthatsedim entofZhuzhousection had pollutedse riously and pollutantconcentration atXiawan wasthehighestamongallsamples. TheconcentrationsofCd, Pb, Zn and Cd reached 4.6~ 58.8timeshigherthan backgroundvaluesofXiangjiangriver, and 1.71~ 1.96times higherthanthe heavym etalvaluesduringthe1980s. There wereon evidenceofNiand Crpollution byevalua tion ofthegeoaccumulationindex. Cd wasthetop pollutantand pollutionlevelhad reached high highestorthe highes.t The highestvaluesofthe heavy metalswere found in the verticalsection samplesbetween 0 cm and 50 cm exceptNiand Cr. |
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