土壤有效Cd浸提剂对Cd的浸提机制

研究比较了六种浸提剂(1mol/l NH_4OAc,1mol/l NH_4NO_3,0.005mol/l DTPA-TEA,0.1mol/l HCl,0.1mol/l CaCl_2,0.1mol/l NaNO_3)在不同土壤条件下对土壤Cd的浸提规律。从浸提剂的特性及pH缓冲能力等角度讨论了其对土壤Cd的浸提机制。结合盆栽试验中植株吸Cd量的相关分析表明,不同浸提剂均有其适合的土壤条件反映Cd的生物有效性,但相对地,0.1mol/l CaCl_2可能是适应性最广的土壤有效Cd浸提剂。

EXTRACTING MECHANISM OF CHEMICAL EXTRACTANTS FOR AVAILABLE CADMIUM IN SOILS

Six soil extractants were compared in terms of their solubilizing ability for Cd, correlation among the amount of Cd solubilized,and solubilization mechanisms in order to select the best extractant for available Cd in soils. It was concluded that all the extractants had the potential to become the best one under certain soil background. However,a relatively universal extractant was considered to be 0.1 mol/1 CaCl2 especially when the correlation with plant Cd uptake was further taken into account.