8种钝化剂对中度Cd污染农田糙米的降解效果研究

Effects of Eight Different Remediation Agents on Reducing Cd Contents in Rice on Moderately Cadmium Contaminated Farmland

纳米材料广泛应用于重金属土壤修复,然而不同纳米钝化剂对降解Cd污染农田的效果鲜有报道。以萍乡市某中度Cd污染稻田为研究对象,选取8种不同纳米材料钝化剂开展田间小区试验,探究不同钝化剂对土壤有效态Cd及水稻糙米Cd含量的影响。结果表明:与CK相比,同一添加水平下,施用8种不同种类钝化剂土壤有效态镉含量无显著变化,但糙米Cd含量均有所下降,其中施用PX5F,SAX3与PX5复配处理效果最好,糙米Cd含量分别下降了82.31%和81.81%。此外,钝化剂SAX3和PX5降Cd的效果随着施用强度的增加而增强,最高降幅分别达到83%和64.12%。

Nano materials have been widely used in heavy metal soil remediation.However,there have been few reports on the effects of different nano remediation agents on Cd polluted farmland.A field experiment was carried out in Cd-contaminated rice fields in Pingxiang to explore the effects of 8 types of remediation agents on the contents of soil available Cd and rice Cd.The results show that compared with CK,at the same level of addition,after applying eight kinds of nano materials soil remediation agents,soil available Cd content did not significant change,while rice Cd content decreased.Among them,the compound treatment of PX5F,SAX3 and PX5 had the best effect,the Cd content of brown rice decreased by 82.31%and 81.81%.In addition,the Cd reduction effect of passivators SAX3 and PX5 increased with the increase of application intensity,and the maximum decreases were 83%and 64.12%respectively.