摘要:

太湖貢湖灣是無錫和(he)蘇(su)州(zhou)重(zhong)(zhong)要(yao)的(de)水源(yuan)地,對(dui)其周邊(bian)主(zhu)(zhu)要(yao)入湖河流(liu)的(de)重(zhong)(zhong)金(jin)(jin)屬(shu)(shu)(shu)(shu)含量進(jin)行調研(yan),并對(dui)生(sheng)(sheng)態(tai)(tai)風(feng)險(xian)進(jin)行評價(jia)十分(fen)必要(yao)。通過(guo)(guo)分(fen)析環貢湖灣主(zhu)(zhu)要(yao)河流(liu)表(biao)(biao)層沉積物(wu)(wu)中Cu、Zn、Pb、Cr、Cd、Ni金(jin)(jin)屬(shu)(shu)(shu)(shu)元(yuan)素的(de)含量特征,利(li)用(yong)Hakanson潛在(zai)(zai)生(sheng)(sheng)態(tai)(tai)危(wei)害指(zhi)數法評價(jia)其生(sheng)(sheng)態(tai)(tai)危(wei)害,同時考察了(le)重(zhong)(zhong)金(jin)(jin)屬(shu)(shu)(shu)(shu)間(jian)的(de)相(xiang)(xiang)關(guan)性(xing),旨在(zai)(zai)為預防和(he)治理貢湖灣重(zhong)(zhong)金(jin)(jin)屬(shu)(shu)(shu)(shu)污染(ran)提供科學(xue)依據。研(yan)究(jiu)結果表(biao)(biao)明(ming),各重(zhong)(zhong)金(jin)(jin)屬(shu)(shu)(shu)(shu)元(yuan)素含量平均(jun)值為w(Cu):(36.26±1.21)mg/kg,w(Zn):(116.53±7.01)mg/kg,w(Pb):(90.76±2.39)mg/kg,w(Cr):(76.46±3.48)mg/kg,w(Cd):(3.22±0.11)mg/kg,w(Ni):(34.04±2.19)mg/kg,通過(guo)(guo)對(dui)比(bi)《土壤環境(jing)質量標準》(GB15618-1995)和(he)沉積物(wu)(wu)重(zhong)(zhong)金(jin)(jin)屬(shu)(shu)(shu)(shu)環境(jing)背景(jing)值,發現貢湖灣周邊(bian)河流(liu)的(de)主(zhu)(zhu)要(yao)污染(ran)是元(yuan)素Cd和(he)Pb。由(you)潛在(zai)(zai)生(sheng)(sheng)態(tai)(tai)危(wei)害指(zhi)數RI可知,4號點位(小(xiao)溪港(gang)河口)污染(ran)最重(zhong)(zhong),達到強(qiang)生(sheng)(sheng)態(tai)(tai)危(wei)害。單(dan)因(yin)子潛在(zai)(zai)危(wei)害系數值表(biao)(biao)明(ming)各點位表(biao)(biao)層沉積物(wu)(wu)主(zhu)(zhu)要(yao)生(sheng)(sheng)態(tai)(tai)風(feng)險(xian)因(yin)子是元(yuan)素Cd,達到中等危(wei)害程度。各元(yuan)素生(sheng)(sheng)態(tai)(tai)風(feng)險(xian)影響(xiang)程度從高到低(di)依次為:Cd>Pb>Cu>Ni>Zn>Cr。生(sheng)(sheng)態(tai)(tai)修復工程對(dui)重(zhong)(zhong)金(jin)(jin)屬(shu)(shu)(shu)(shu)生(sheng)(sheng)態(tai)(tai)危(wei)害降低(di)起到了(le)一定(ding)的(de)作用(yong),但是小(xiao)溪港(gang)流(liu)域的(de)變化較(jiao)小(xiao);重(zhong)(zhong)金(jin)(jin)屬(shu)(shu)(shu)(shu)相(xiang)(xiang)關(guan)分(fen)析表(biao)(biao)明(ming),Cu-Cr,Zn-Pb之間(jian)呈極顯著(zhu)正相(xiang)(xiang)關(guan)的(de)關(guan)系(R2<0.01),具有(you)較(jiao)好的(de)同源(yuan)性(xing)。

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