某些市售化肥的重金属含量水平及环境风险

对国内使用的部分化肥中Fe、Mn、Cu、Pb、Zn、Cd和Hg的总量及可溶态含量的测定结果表明,氮肥和钾肥中重金属元素含量较低;复合肥和磷肥中重金属元素含量较高。绝大多数化肥中Cu、Pb、Zn、Cd不超过土壤环境质量二级标准,使用是安全的。但某些复合肥料和电子束脱硫生产的氮肥中Hg含量过高,个别复合肥料中Zn含量过高,具有一定的环境风险。

Heavy metals in chemical fertilizer and environmental risks

Determination of concentrations of the total and soluble forms of Fe,Mn,Cu,Pb,Zn,Cd,and Hg in some chemical fertilizers used in the country was conducted.The results showed that in the nitrogenous fertilizers and potash fertilizers,the content of heavy metals is relatively low while in the compound fertilizers and phosphorus fertilizer it is relatively high.In most of the chemical fertilizers,the contents of Cu,Pb,Zn,and Cd are controlled below the second grade standard for soil environmental quality and hence safe to use.But in some of the compound fertilizers and the nitrogenous fertilizer produced through sweetening with electron beam,the content of Hg well exceeded the standard,and Zn too.The use of these fertilizers,therefore,may have certain environmental risks.