CAJ | 학술논문

为了解淮南采煤沉陷区土壤中镉的赋存特征和潜在危害，以淮南顾桥采煤沉陷区为例，采用DTPA提取法和 Tessier逐级连续提取法，对其土壤中Cd的形态分布及生物有效性进行了研究．结果表明，研究区土壤中总Cd和有效态Cd 均在表层农田土壤0～20 cm富集，两者呈显著正相关．总C d是淮南土壤背景值的3.67倍，且C d的平均活化率为37.86％，有较强活性．土壤中C d的不同形态含量关系为残渣态（50.59％）＞可交换态（23.24％）＞铁锰氧化物结合态（15.77％）＞碳酸盐结合态（6.18％）＞有机物结合态（4.22％）．土壤中C d的生物可利用态（可交换态）和生物潜在可利用态（铁锰氧化物结合态、碳酸盐结合态、有机物结合态）比例分别为23.24％和26.17％，其在矿区土壤环境影响下易于转化为有效态．土壤中有机质、总氮、总磷是影响Cd各形态分布的重要因素，同时pH的改变也是其他形态转化为有效态的关键因素．
위료해회남채매침함구토양중력적부존특정화잠재위해，이회남고교채매침함구위례，채용DTPA제취법화 Tessier축급련속제취법，대기토양중Cd적형태분포급생물유효성진행료연구．결과표명，연구구토양중총Cd화유효태Cd 균재표층농전토양0～20 cm부집，량자정현저정상관．총C d시회남토양배경치적3.67배，차C d적평균활화솔위37.86％，유교강활성．토양중C d적불동형태함량관계위잔사태（50.59％）＞가교환태（23.24％）＞철맹양화물결합태（15.77％）＞탄산염결합태（6.18％）＞유궤물결합태（4.22％）．토양중C d적생물가이용태（가교환태）화생물잠재가이용태（철맹양화물결합태、탄산염결합태、유궤물결합태）비례분별위23.24％화26.17％，기재광구토양배경영향하역우전화위유효태．토양중유궤질、총담、총린시영향Cd각형태분포적중요인소，동시pH적개변야시기타형태전화위유효태적관건인소．
Cadmium in soils of coal‐mining subsidence poses potential ecological risks .DTPA extraction and Tessier sequential extraction methods were used to investigate the speciation and bioavailability of Cd in subsidence soils of Guqiao Coal Mine .The results show that total Cd and availability Cd are highly correlated ,and are both enriched in topsoil (0~20 cm) .Cadmium in studied soils is 3.67 times of that in the Huainan background soil ,with a high activation rate of 37.86% .The proportions of different Cd species in studied soils are :residual fraction (50.59% )>exchangeable fraction (23.24% )> Fe‐Mn oxides bound fraction (15.77% ) > carbonate bound fraction (6.18% ) > organic bound fraction (4.22% ) . Bioavailable (exchangeable) and potentially bioavailable Cd (carbonate bound , Fe‐Mn oxide bound , organic bound) account for 23.24% and 26.17% ,respectively ,which could be activated under the soil environment of mines .The organic matter ,total nitrogen and total phosphor of soil are the main factors controlling Cd species .In addition ,the variation of pH values in soil could promote the conversion of Cd in other forms to bioavailable forms .