以油菜秸秆、胡麻秸秆和鸡粪为原料制得了3种生物炭,探究了这3种生物炭对镉和镉铅复合污染土壤性质和镉形态变化的影响。结果表明,土壤TOC含量、pH、电导率(EC)和残渣态镉含量均随着生物炭施加质量分数(1%、3%、5%、10%)的增加而提高,而阳离子交换量(CEC)无明显规律性变化,且3种生物炭对镉铅复合污染土壤中镉的固定效果均优于镉单一污染。此外,镉形态转化与土壤TOC含量、pH和EC改变有显著相关性,与CEC相关性较低。

Three types of biochar are made from rapeseed straw,hemp straw,and chicken manure,respectively,and their influences on the properties of cadmium alone and cadmium-lead jointly contaminated soil,as well as the changes in cadmium forms are explored.It is shown by results that the total organic carbon (TOC) content,pH,electrical conductance (EC),and residual cadmium content in the soil all increase with the increasing application rate (1%,3%,5%,10%) of biochar.However,there is no significant regular variation in cation exchange capacity (CEC).Additionally,all 3 types of biochar have a better effect on immobilizing cadmium in cadmium-lead jointly contaminated soil than that on immobilizing cadmium in cadmium alone polluted soil.Moreover,the transformation of cadmium forms has a significant correlation with changes of TOC content,pH,and EC,while less correlation with CEC.

康明晖(1998-),男,硕士生,研究方向为土壤污染控制,1719806371@qq.com。