CAJ | 학술논문

分析了刁江流域矿区尾砂和上、中、下游地区土壤剖面重金属的含量. 结果表明:刁江流域上、中、下游地区都不同程度受到As,Pb和Zn的污染. 上游(距污染源16 km)表层土壤中w(As),w(Pb)和w(Zn)与尾砂相当,分别高达2.4×10~4,5.6×10~3 和1.2×10~4 mg/kg,下游拉烈和百旺(分别距污染源154和192 km)2个采样点表层土壤中w(As),w(Pb)和w(Zn)的平均值分别是<土壤环境质量标准>(GB15618-1995)三级标准的47.05,1.81和5.48倍. 表层土壤中w(As)和w(Pb)随采样点距污染源的距离增加呈幂函数下降,w(Zn)呈线性下降,表明Zn在流域内的迁移能力大于Pb和As. 土壤剖面中3种重金属的质量分数均随土层深度的增加呈降低趋势,在土壤剖面的迁移能力表现为Zn>Pb>As. 总体上看,刁江流域土壤污染与尾砂中重金属的形态及其迁移特征密切相关,尾砂的排放控制和治理应该是刁江流域污染整治的关键.
분석료조강류역광구미사화상、중、하유지구토양부면중금속적함량. 결과표명:조강류역상、중、하유지구도불동정도수도As,Pb화Zn적오염. 상유(거오염원16 km)표층토양중w(As),w(Pb)화w(Zn)여미사상당,분별고체2.4×10~4,5.6×10~3 화1.2×10~4 mg/kg,하유랍렬화백왕(분별거오염원154화192 km)2개채양점표층토양중w(As),w(Pb)화w(Zn)적평균치분별시<토양배경질량표준>(GB15618-1995)삼급표준적47.05,1.81화5.48배. 표층토양중w(As)화w(Pb)수채양점거오염원적거리증가정멱함수하강,w(Zn)정선성하강,표명Zn재류역내적천이능력대우Pb화As. 토양부면중3충중금속적질량분수균수토층심도적증가정강저추세,재토양부면적천이능력표현위Zn>Pb>As. 총체상간,조강류역토양오염여미사중중금속적형태급기천이특정밀절상관,미사적배방공제화치리응해시조강류역오염정치적관건.
Soil profiles of arsenic (As), lead (Pb) and zinc (Zn) contents were investigated in mine tailings in the upstream, midstream, and downstream areas of the Diaojiang River valley. It was shown that the soils in the upstream, midstream, and downstream areas in the Diaojiang River valley were polluted by As, Pb and Zn to different degrees. The heavy metal concentrations in the surface soils in the upper reaches, 16 km from the mining site, were high up to 2.4×10~4, 5.6×10~3 and 1.2×10~4 mg/kg for As, Pb and Zn, respectively, which were close to the heavy metal concentrations in the mine tailings. The average concentrations of As, Pb and Zn in the two samples which were collected in the lower reaches, 154 and 192 km from the mining site, were 47.05, 1.81, and 5.48 times higher than the third grade soil environmental quality standard for soils (GB15618-1995). The concentrations of As and Pb in the surface soils decreased following power functions with the increase of distance of the sample points from the mining site. Zn concentration decreased slower than Pb and Zn in a linear type, which might indicate that Zn had higher mobility than Pb and As when transported by river flow. Heavy metal concentrations decreased as depth of soil layer increased in soil profile. The mobility of the three heavy metals in the soil profile might follow the sequence Zn>Pb>As. In general, heavy metal pollution in the Diaojiang River valley soils had a very close relation to the speciation and transfer characteristics of heavy metals in the mine tailings, so it should be the key to control mine tailing discharge and to clean mine tailings from the river and the soils for the environmental remediation of the Diaojiang River.