摘要:

從苕(tiao)(tiao)溪(xi)流域景觀單元角(jiao)度研究(jiu)重(zhong)金(jin)(jin)(jin)屬污(wu)染(ran)(ran)特(te)征,因(yin)人類活(huo)(huo)動是重(zhong)金(jin)(jin)(jin)屬污(wu)染(ran)(ran)的(de)主(zhu)要來源,所以在(zai)苕(tiao)(tiao)溪(xi)流域內(nei)選擇采集(ji)典(dian)(dian)型(xing)(xing)工(gong)(gong)業(ye)(ye)(ye)(ye)區(qu)(qu)(qu)(qu)、農業(ye)(ye)(ye)(ye)區(qu)(qu)(qu)(qu)和城(cheng)(cheng)鎮(zhen)生(sheng)(sheng)(sheng)活(huo)(huo)區(qu)(qu)(qu)(qu)附近河道的(de)沉(chen)積物,分析各(ge)(ge)典(dian)(dian)型(xing)(xing)區(qu)(qu)(qu)(qu)域重(zhong)金(jin)(jin)(jin)屬Pb、Cd、Cr、As、Hg、Cu和Zn的(de)含量特(te)征,并(bing)用潛(qian)(qian)(qian)在(zai)生(sheng)(sheng)(sheng)態(tai)危害指(zhi)數法(fa)評(ping)價(jia)。結果(guo)表明(ming),按(an)照《土壤環境質量標準》,苕(tiao)(tiao)溪(xi)流域典(dian)(dian)型(xing)(xing)工(gong)(gong)業(ye)(ye)(ye)(ye)區(qu)(qu)(qu)(qu)主(zhu)要是Hg、Cu和As的(de)污(wu)染(ran)(ran),典(dian)(dian)型(xing)(xing)農業(ye)(ye)(ye)(ye)區(qu)(qu)(qu)(qu)和城(cheng)(cheng)鎮(zhen)生(sheng)(sheng)(sheng)活(huo)(huo)區(qu)(qu)(qu)(qu)主(zhu)要是Hg的(de)污(wu)染(ran)(ran)。各(ge)(ge)元素間的(de)相關(guan)(guan)性分析表明(ming),在(zai)工(gong)(gong)業(ye)(ye)(ye)(ye)區(qu)(qu)(qu)(qu):Zn-As、Zn-Pb和As-Pb之(zhi)間存(cun)在(zai)相關(guan)(guan)關(guan)(guan)系(xi)(xi),說明(ming)它(ta)們的(de)同(tong)源性很高。在(zai)農業(ye)(ye)(ye)(ye)區(qu)(qu)(qu)(qu):Cu-As、Cu-Cd之(zhi)間存(cun)在(zai)顯著相關(guan)(guan)關(guan)(guan)系(xi)(xi),其來源有可能(neng)相似。在(zai)城(cheng)(cheng)鎮(zhen)生(sheng)(sheng)(sheng)活(huo)(huo)區(qu)(qu)(qu)(qu)Zn-As、Zn-Cd之(zhi)間存(cun)在(zai)很高的(de)相關(guan)(guan)性,說明(ming)它(ta)們有很高的(de)同(tong)源性。由多種重(zhong)金(jin)(jin)(jin)屬潛(qian)(qian)(qian)在(zai)潛(qian)(qian)(qian)在(zai)生(sheng)(sheng)(sheng)態(tai)風險評(ping)價(jia)結果(guo)可知:苕(tiao)(tiao)溪(xi)流域典(dian)(dian)型(xing)(xing)工(gong)(gong)業(ye)(ye)(ye)(ye)區(qu)(qu)(qu)(qu)、城(cheng)(cheng)鎮(zhen)區(qu)(qu)(qu)(qu)和農業(ye)(ye)(ye)(ye)區(qu)(qu)(qu)(qu)的(de)沉(chen)積物處于(yu)低潛(qian)(qian)(qian)在(zai)生(sheng)(sheng)(sheng)態(tai)風險。

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