本文選題：重金屬 + 空間分布�。� 參考：《遼寧大學(xué)》2017年碩士論文

【摘要】：太子河是遼寧省境內(nèi)的主要河流之一,流經(jīng)本溪、營(yíng)口、鞍山和遼陽(yáng)等城市,為流經(jīng)地區(qū)人們?nèi)粘Ｉ�、生產(chǎn)提供了水源。尤其是太子河本溪城區(qū)段,長(zhǎng)期以來(lái),太子河本溪城區(qū)段周圍的工廠和本溪市居民產(chǎn)生了大量的工業(yè)廢水和生活污水,這些廢水大部分都排入了太子河,使太子河水體及表層沉積物都遭受了嚴(yán)重的污染。為此,開展太子河本溪城區(qū)段河流重金屬的空間分布及風(fēng)險(xiǎn)分析十分有必要。本研究進(jìn)行了太子河本溪城區(qū)段水體重金屬含量的空間分布研究和綜合污染進(jìn)行分析。結(jié)果可知,下游采樣點(diǎn)的重金屬含量普遍比上游采樣點(diǎn)的重金屬含量高,大部分采樣點(diǎn)中的重金屬含量均低于國(guó)家地表水三類標(biāo)準(zhǔn)。應(yīng)用PHREEQC軟件對(duì)As,Cu,Zn,Pb,Cd在水體中的存在形態(tài)進(jìn)行了模擬。由模擬結(jié)果分析可知,太子河本溪城區(qū)段水體中的Cu主要以CuCl2-、CuCl32-、Cu(OH)2和CuCO3這四種形式存在;Zn的主要存在形態(tài)為Zn2+、Zn(OH)2、ZnCO3、ZnSO4;Pb主要存在形態(tài)為PbCO3、Pb2+、PbOH+、PbSO4;Cd的主要存在形態(tài)為CdCl+、Cd2+、CdCl2、CdSO4;As主要存在形態(tài)為HAsO42-和H2AsO4-。通過(guò)對(duì)太子河本溪城區(qū)段河流表層沉積物中重金屬的污染程度進(jìn)行評(píng)價(jià),得出其污染程度依次為:CdFeZnCr≈Mn≈NiCu≈Pb。利用潛在生態(tài)危害指數(shù)法對(duì)太子河本溪城區(qū)段除Fe以外的其他七種重金屬進(jìn)行評(píng)價(jià)分析,評(píng)價(jià)結(jié)果為,太子河本溪城區(qū)段的河流表層沉積物重金屬具有很強(qiáng)的潛在生態(tài)危害性,其主要污染物為Cd元素,應(yīng)對(duì)各個(gè)采樣點(diǎn)均加以防御。分別對(duì)太子河本溪城區(qū)段河流表層沉積物中的八種重金屬進(jìn)行了相關(guān)性分析和聚類分析,分析結(jié)果表明,太子河本溪城區(qū)段河流表層沉積物重金屬中Pb、Cd和Mn三種重金屬具有一定的同源性;Cu與Pb、和Cd三種重金屬也具有較好的同源性。
[Abstract]:Princeling River is one of the main rivers in Liaoning Province, which flows through Benxi, Yingkou, Anshan and Liaoyang cities.In particular, for a long time, the factories around the Benxi section of the princeling River and the residents of Benxi City produced a large amount of industrial and domestic sewage, most of which was discharged into the princeling River.The water body and surface sediment of the princeling River are seriously polluted.Therefore, it is necessary to analyze the spatial distribution and risk of heavy metals in Benxi section of Taizi River.In this study, the spatial distribution of heavy metals in Benxi section of Taizi River was studied and the comprehensive pollution was analyzed.The results show that the heavy metal content in the downstream sampling sites is generally higher than that in the upstream sampling sites, and the heavy metal contents in most of the sampling sites are lower than the national surface water standards.In this paper, PHREEQC software was used to simulate the forms of CD and CD in water.According to the analysis of simulation results,By evaluating the pollution degree of heavy metals in the surface sediments of Benxi section of Taizi River, it is found that the pollution degree of heavy metals is in the order of: CdFeZnCr 鈮，

本文編號(hào)：1750112