期刊论文

Effects of combined amendment on transport and accumulation of Cd and Zn in soil-rice system and the related health risk assessment

Liao, B.

中文

环境科学学报

0253-2468

2018

38

4

1635-1641

10.13671/j.hjkxxb.2017.0478

Supported by the Special Fund for Ministry of Agriculture and Finance (No.NBCH 2016), the National Natural Science Foundation of China (No.41501344) and the Key Discipline Construction Projects in Hunan Province(No.2006180)

本校为第一且通讯机构

选取湖南省长沙市北山镇某中重度Cd污染稻田,研究了土壤调理剂(石灰石+偏高岭土+钙镁磷肥)对稻田土壤重金属Cd、Zn的钝化效果,以及对水稻各部位累积Cd和Zn的影响,并进行了Cd的健康风险评价.结果表明,使用土壤调理剂提高了稻田土壤pH值.Cd的CaCl_2提取态含量降低了0.9%~ 24.1%,Zn的CaCl_2提取态含量降低了22.5%~ 69.6%.土壤调理剂显著降低了水稻糙米中Cd与Zn的含量,与对照相比分别降低了10.8%~ 47.3%、10.3%~ 17.5%;土壤调理剂对水稻糙米Cd的吸收和累积的影响要远大于Zn,水稻糙米中的Cd/Zn比随着土壤调理剂施用量的增加而显著降低.研究区大米重金属Cd目标危害系数THQ值大于1,说明当地人群通过食用...

An in-situ experiment was conducted in Beishan Town, Changsha, Hunan, an area with paddy soil contaminated severely with Cd and partly with Zn, to study the effects of a combined amendment (calcium carbonate + metakaolin + fused calcium-magnesium phosphate) stabilizing Cd and/or Zn and on the accumulation of Cd and/or Zn in rice organs and to evaluate the Cd health risk potential caused from rice consumption. The results showed that application of the combined amendment significantly increased soil pH. The contents of CaCl 2 -extractable Cd in ...