中国岩溶
中國巖溶
중국암용
CARSOLOGICA SINICA
2013年
4期
377-383
,共7页
地下河%砷迁移%影响因素%相关性分析%广西南丹县
地下河%砷遷移%影響因素%相關性分析%廣西南丹縣
지하하%신천이%영향인소%상관성분석%엄서남단현
subterranean stream%transport process of arsenic%influence factors%correlation analysis%Nan-dan county,Guangxi
以广西南丹县里湖地下河作为研究区,对砷在地下河中的存在形态,迁移过程及其影响因素进行了分析。结果发现,里湖地下河中砷浓度较高且与人类活动密切相关；由于地下河中相对较低的氧化还原环境,使毒性更强的 As(III)含量超过 As(V),占总无机砷的53%,增加了该地区发生砷中毒的风险；总 As、As (III)和 As(V)在地下河中衰减了51%、36%、59%。相关性分析结果表明,沉积物中的 Fe、Ca、Mn、有机质及水体中的 Ca2+与沉积物中的砷呈现显著正相关关系,有助于水体中砷的吸收；而水体中的 Cl-、SO 2-4、HCO -3与沉积物中的砷呈现负相关关系,不利于砷的吸附,其中 HCO -3的抑制作用最为明显。与非岩溶区水体相比,Ca 和 HCO -3成为影响砷迁移转化的主要因素,因此在岩溶地下河砷污染治理中应考虑岩溶区的水文地质特点,提高砷的污染治理效率。
以廣西南丹縣裏湖地下河作為研究區,對砷在地下河中的存在形態,遷移過程及其影響因素進行瞭分析。結果髮現,裏湖地下河中砷濃度較高且與人類活動密切相關；由于地下河中相對較低的氧化還原環境,使毒性更彊的 As(III)含量超過 As(V),佔總無機砷的53%,增加瞭該地區髮生砷中毒的風險；總 As、As (III)和 As(V)在地下河中衰減瞭51%、36%、59%。相關性分析結果錶明,沉積物中的 Fe、Ca、Mn、有機質及水體中的 Ca2+與沉積物中的砷呈現顯著正相關關繫,有助于水體中砷的吸收；而水體中的 Cl-、SO 2-4、HCO -3與沉積物中的砷呈現負相關關繫,不利于砷的吸附,其中 HCO -3的抑製作用最為明顯。與非巖溶區水體相比,Ca 和 HCO -3成為影響砷遷移轉化的主要因素,因此在巖溶地下河砷汙染治理中應攷慮巖溶區的水文地質特點,提高砷的汙染治理效率。
이엄서남단현리호지하하작위연구구,대신재지하하중적존재형태,천이과정급기영향인소진행료분석。결과발현,리호지하하중신농도교고차여인류활동밀절상관；유우지하하중상대교저적양화환원배경,사독성경강적 As(III)함량초과 As(V),점총무궤신적53%,증가료해지구발생신중독적풍험；총 As、As (III)화 As(V)재지하하중쇠감료51%、36%、59%。상관성분석결과표명,침적물중적 Fe、Ca、Mn、유궤질급수체중적 Ca2+여침적물중적신정현현저정상관관계,유조우수체중신적흡수；이수체중적 Cl-、SO 2-4、HCO -3여침적물중적신정현부상관관계,불리우신적흡부,기중 HCO -3적억제작용최위명현。여비암용구수체상비,Ca 화 HCO -3성위영향신천이전화적주요인소,인차재암용지하하신오염치리중응고필암용구적수문지질특점,제고신적오염치리효솔。
The arsenic pollutants generated by the arsenic industries and mining enterprises in karst area flow into subterranean streams and contaminate groundwater easily because of the unique hydrogeological charac-teristics of karst area,which is a serious threat to the water ecologic security and local residents’health.In order to elucidate the geochemistry reaction mechanisms of arsenic in karst subterranean streams,the Lihu subterranean stream in Nandan county,Guangxi Province,Southwest China,is selected for the study.The main outcropped lithology in the Lihu subterranean stream catchment is Carboniferous-Triassic limestone and the karstification rate is 31.67 %.Arsenic species,sediment physical-chemical properties and hydro-chemical characteristics of the water are analyzed by inductively coupled plasma mass spectrometer (ICP-MS),X-ray fluorescence spectrometer (XRF)and plasma spectrometer (ICP)respectively.The results show that arsenic concentration in the Lihu subterranean stream is high and it is closely related to human activities.The con-tent of As (III),higher than As (V),occupies 53 % of the total inorganic arsenic in the Lihu subterranean stream due to the low redox environment,which increase the arsenic ecological risk in this region.The con-tents of total arsenic and As (III)as well as As (V)are attenuated by 5 1 %,36 %,59 % respectively in the underground river.Correlation coefficient analysis calculated with SPSS indicates that sediment Fe,sediment Ca,sediment organic matter,sediment Mn and water Ca2 + are the positive factors that promoting the deposi-tion of arsenic from water.While water Cl- ,SO 2 -4 and HCO -3 ,negatively correlated with arsenic in the wa-ter,do not facilitate to absorb arsenic.Compared with other water bodies,such as Quaternary groundwater, surface rivers and lakes waters,Ca and HCO -3 turn out to be the important factors for mobilization and transformation of arsenic due to the high calcium and bicarbonate content in karst water.Therefore,karst hydrogeological characteristics should be considered during arsenic contamination treatment in karst ground-water.
