中国商品有机肥重金属分析

测定了来自10个地区不同生产原料的118个商品有机肥样品的重金属含量.结果表明:(1)商品有机肥样品中的Cd、Hg、Pb、Cr、As、Zn、Cu、Ni的平均值分别为0.600、0.120、7.34、84.30、9.45、202.91、91.06、11.01 mg/kg.(2)河南、湖北、上海的商品有机肥中8种重金属平均值均较高;内蒙古的商品有机肥中Cr平均值为20.32 mg/kg,广西的商品有机肥中Zn平均值为51.36mg/kg,远低于所有样品中Cr和Zn平均值.(3)以猪粪为主要生产原料的商品有机肥中重金属平均值最高.(4)Cr超过中国商品有机肥重金属限量标准、欧盟生态标志法的重金属限量标准、加拿大堆肥重金属限量标准(A级)和加拿大堆肥重金属限量标准(B级);As、Cd超过中国商品有机肥重金属限量标准、欧盟生态标志法的重金属限量标准和加拿大堆肥重金属限量标准(A级);Cu、Zn超过欧盟生态标志法的重金属限量标准和加拿大堆肥重金属限量标准(A级);Hg超过加拿大堆肥重金属限量标准(A级);Pb超过中国商品有机肥重金属限量标准;Ni均未超标.

Analyze on the heavy metals content in China commodity organic fertilizer

The content of heavy metals in 118 commodity organic fertilizer samples which collected from 10 districts and produced by different raw materials were analyzed.The results showed that the average contents of Cd,Hg,Pb,Cr,As,Zn,Cu,Ni were 0.600,0.120,7.34,84.30,9.45,202.91,91.06,11.01 mg/kg respectively.The average content of heavy metals was relative higher in commodity organic fertilizer of Henan,Hubei,Shanghai;the average Cr content in Inner Mongolia fertilizer samples and average Zn content in Guangxi fertilizer samples was 20.32,51.36 mg/kg respectively,which was lower than average Cr,Zn content of all fertilizer samples.The commodity organic fertilizer samples produced by pig manure had the highest heavy metal content.In reference to the limit indexes of heavy metals in commodity organic fertilizer in China,heavy metal limitations standard in Europe and heavy metal limitations standard of compost in Canada(Category A and Category B),Cr exceeded all those four limitations standard;As,Cd could only meet the Category B of Cananda limitations standard;Cu,Zn exceeded the limitations standard of European and Category A of Cananda;Hg exceeded the Category A limitations standard of Cananda;Pb exceeded the limitations standard of Chinese;Ni could meet all these four limitation standards.