巢湖藻-草-泥有机肥的重金属安全性评价

发布时间：2018-06-29 15:21

本文选题：大白菜 + 巢湖蓝藻　；参考：《江苏农业科学》2017年18期

【摘要】：针对巢湖取出物蓝藻、水草和底泥作为有机肥利用可能带来的重金属安全性问题,采用高温堆肥制成有机肥,测定有机肥、盆栽土壤和大白菜体内重金属的含量;采用内梅罗污染指数法和单因子污染指数法分别评价土壤和大白菜中重金属的安全性。结果表明,有机肥、盆栽土壤和大白菜中的铅含量分别为0.16、0.24、0.05 mg/kg;铬含量分别为0.29、0.12、0.02 mg/kg;其余3种重金属(砷、镉、汞)在三者体内的含量均为0.04、0.01、0.04 mg/kg。重金属评价结果表明,藻-草-泥有机肥中重金属含量远低于有机肥料中限量指标的要求,符合重金属安全标准。土壤中的综合污染指数为0.05,远小于安全等级的限量值,属于安全等级,此土壤上种植的作物不会被污染。大白菜中铅、砷、铬、镉单因子污染指数分别为0.26、0.08、0.04、0.20,远小于清洁水平的限量值,且均符合无公害蔬菜的安全要求。
[Abstract]:Aiming at the safety of heavy metals in the use of cyanobacteria, water grass and sediment as organic fertilizer in Chaohu Lake, organic manure was made by composting at high temperature, and the contents of heavy metals in organic manure, potted soil and Chinese cabbage were determined. The safety of heavy metals in soil and Chinese cabbage was evaluated by Nemero pollution index method and single factor pollution index method respectively. The results showed that the contents of lead in organic fertilizer, potted soil and Chinese cabbage were 0.16 ~ 0.24 ~ 0. 05 mg / kg, Cr = 0. 29 ~ 0. 12 ~ 0. 02 mg / kg, and the other three heavy metals (arsenic, cadmium, mercury) were 0.04 ~ 0. 01 ~ 0. 04 mg 路kg ~ (-1) 路kg ~ (-1) respectively. The results of heavy metal evaluation showed that the content of heavy metals in algae-grass-mud organic fertilizer was much lower than the limit index of organic fertilizer, which was in line with the safety standard of heavy metals. The comprehensive pollution index in the soil is 0.05, which is far less than the limited value of the safety grade and belongs to the safety grade. The crops planted on the soil will not be contaminated. The single factor pollution index of lead, arsenic, chromium and cadmium in Chinese cabbage was 0.26 ~ 0.08 ~ 0.04 ~ 0.20, which was far less than the limit value of clean level, and all of them met the safety requirements of pollution-free vegetables.
【作者单位】：江苏省农业科学院农业资源与环境研究所;
【基金】：国家水专项巢湖项目(编号:2012ZX07103-005)
【分类号】：S141;X820

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