In this study,compound fertilizers,organic fertilizers and organic-inorganic blended fertilizers were used to determine the contents of five metals in fertilizers:As,Hg,Pb,Cd and Cr by the methods specified in GB/T 23349-2020"Determination of Arsenic,Cadmium,Chro-mium,Lead and Mercury Content in Fertilizers",and the pollution degree of heavy metals in fertilizers was evaluated by single factor pollution index method and Nemerow comprehensive pollution index method.The results showed that a total of 33 samples of the three types of fertilizers tested did not exceed the heavy metal standard.The results of the single-factor pollution index of heavy metals and the Nemerow pollution index-showed that the single-factor pollution index of 5 heavy metals in the three fertilizers was at the clean level,and the single-factor pollution index of various heavy metals in organic fertilizers was high,among which Pb was the highest,followed by Cd.The Nemerow pollution index of the three fertilizers was 0.10～0.54,all of which were at the safety level,and the Nemerow pollution index of organic fertilizers was the highest.The fertilizer quality in Zunyi City is generally good,and the farmland application is safe,but in the production of organic fertilizer,the control of Pb and Cd content should be strengthened.
关键词
遵义市/重金属/风险评价/单因子污染指数/内梅罗综合污染指数
Key words
Zunyi City/Heavy Metal/Risk Assessment/Single Factor Pollution Index/Nemerow Pollution Index
维普
万方数据