北京市水溶肥料重金属元素分析与评价

研究分析北京地区水溶肥料中的重金属元素,为农产品质量安全生产提供基础依据.对2012—2019年水溶肥料样品中Hg、As、Pb、Cr和Cd等有害元素进行调查统计,参照中国农业行业标准和内梅罗综合污染指数法进行分析与污染评价.结果表明,水溶肥料中Hg、As、Pb、Cr和Cd平均质量分数分别为0.04、3.8、3.9、4....

Comment and Degree of Contamination of Heavy Metals in Water-SolubleFertilizers in Beijing

To research and analyze the heavy metals in water-soluble fertilizers products in Beijing,so as to provide basic data for safe production of agricultural products.In this paper,the contents of Hg,As,Pb,Cr and Cd in water-soluble fertilizers products from 2012 to 2019 of Beijing were counted,the analysis was done with the reference to the agricultural standards of China,and the degree of pollution was evaluated.The results indicated that the mean content of Hg,As,Pb,Cr and Cd were 0.04,3.8,3.9,4.3 and 1.2 mg·kg^?1,respectively,which were lower than the limitation of agricultural standard NY/T 1110—2010.There are some fertilizer samples in which heavy metal contents exceed the maximal limits,among them one sample was as high as 625 mg·kg?1 and dozens of times the maximal limits.But the proportion is very low and mainly occurred in As and Cd with exceeding percentage of 2.50%and 0.5%separately.They are mainly distributed in water-soluble fertilizer-NPK,fertilizer-micronutrients and fertilizer-humic-acids.The single factor pollution index was less than 0.7,which indicated the heavy metals were clean level.The pollution degree of As was higher than others,and then the Cd.Nemerow integrated factor pollution index ranged from 0.11?0.51,which demonstrated that water-soluble fertilizers were clean and safe level.Results showed that heavy metal pollution in water-soluble fertilizers containing micronutrients was the most severe,and then the water-soluble fertilizers containing amino-acids.In general,the content of heavy metals in water-soluble fertilizers in Beijing was low,and it was safe for the environment.However,more attention should be paid to the safety of As and Cd in the application.