Control Effect of Different Remediation Materials on Rice Heavy Metals and Health Risk Assessment
Field single factor experiments were carried out in a polluted area in Yujiang District of Yingtan City with four modification including one of selenium fertilizer named Xitaitai,one of silicon fertilizer named Mengjiangge,powder of Oyster named Repairing Dragon(CaO≥40%)and lime(CaO≥90%).The effects on remediation of heavy metal pollution in paddy soil and heavy metal content in rice were evaluated.The 5-point method was used to collect samples of each treatment of soil and rice at rice ripening stage,and the heavy metal content of the samples was analyzed.The pollution degree of each heavy metal element was evaluated using the single-factor pollution index method.The comprehensive pollution status of soil heavy metals were evaluated by the weighted average composite index method,the Nemero composite index method and the potential ecological risk index method,which were used to determine the propotion of heavy metal pollution factors through the improved hierarchical analysis method.Besides,the high-risk quotient(HQ)and the high-risk index(HI)methods were used to evaluate the health risks of rice heavy metal content to human.The results showed that the single-factor pollution index showed that soilPb was under standard,Cu and Cr were slight pollution,and Cd was heavy pollution.In addition,the results of the evaluation of the weighted average composite index(WACI)method and the potential ecological risk index(PRI)method showed that the study area was at a mild ecological risk in general,but the Nemero composite index(NCI)showed that the soil was moderately polluted.Although the evaluation methods showed that the field soil comprehensive pollution degree were different,they all indicated that Cd was the most ecological risk element.The elements exceeding the national standard of rice were Cr and Pb,but their HQ and HI values were less than 1.0,indicating that rice of the field had no risk of consumption.The Cd content of the rice treated with Mengjiangge decreased the most,reaching 57%,indicating that the cadmium polluted paddy can be remediated by spraying Mengjiangge foliar fertilizer.
万方数据
维普
