CAJ | 학술논문

以干旱区绿洲耕层土壤为研究对象,通过盆栽试验,利用Tessier连续提取法研究了原状土以及外源可溶性重金属Cd,Pb,zn加入土壤后重金属形态分布,分析了土壤中重金属不同化学形态与芹菜有效性之间的关系.结果表明:原状土壤中Cd主要以铁锰氧化态和碳酸盐结合态形式存在,Pb和Zn主要以残渣态形式存在;随着重金属负荷的增大,三种重金属各形态质量分数均有不同程度的提高.Cd以可交换态和碳酸盐结合态为主要赋存形态,Pb和Zn均以碳酸盐结合态和铁锰氧化态为主要赋存形态.实验土壤中,对芹菜Cd吸收量贡献最大的分别为可交换态和碳酸盐结合态,对Pb吸收量贡献最大的分别是碳酸盐结合态和铁锰氧化态,对Zn吸收量贡献最大的分别是碳酸盐结合态和可交换态.
이간한구록주경층토양위연구대상,통과분재시험,이용Tessier련속제취법연구료원상토이급외원가용성중금속Cd,Pb,zn가입토양후중금속형태분포,분석료토양중중금속불동화학형태여근채유효성지간적관계.결과표명:원상토양중Cd주요이철맹양화태화탄산염결합태형식존재,Pb화Zn주요이잔사태형식존재;수착중금속부하적증대,삼충중금속각형태질량분수균유불동정도적제고.Cd이가교환태화탄산염결합태위주요부존형태,Pb화Zn균이탄산염결합태화철맹양화태위주요부존형태.실험토양중,대근채Cd흡수량공헌최대적분별위가교환태화탄산염결합태,대Pb흡수량공헌최대적분별시탄산염결합태화철맹양화태,대Zn흡수량공헌최대적분별시탄산염결합태화가교환태.
Soil samples were collected from the plowing layer of the arid oasis region and studied through pot experiments. Using Tessier sequential extraction, the distribution of chemical forms of heavy metals added in tested soil was investigated, as well as the relationship between the concentrations of chemical forms of studied heavy metals and their availability to celery. The results show that Cd existed mainly in Fe-Mn oxides bound form, while Pb and Zn mainly in residual fraction in the original soil. With the increasing amounts of heavy metals added into the soil, the concentrations of all five forms of the three metals increased to different extents. Exotic Cd of soil was found to be predominant in exchangeable form and carbonate-bound form,while exotic Pb combined with Zn was found predominantly in carbonate-bound form and Fe-Mn oxide-bound form. Cd of exchangeable form and carbonate-bound form, Pb of carbonate-bound form and Fe-Mn oxides bound form, Zn of carbonate-form and exchangeable form made the most contributions to the content of Cd,Pb and Zn in celery, respectively.