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(一)评价方法和污染标准的确定要评价农用粉煤灰中有害物质对土壤粮食的污染问题,首先要确定污染标准和评价方法,才能确定施灰后是否污染及污染程度。在这方面我们主要参照北京东南郊污灌区和天津市污灌区的环境质量评价方法和标准。1、污染起始值:我们把不含灰对照土壤及其作物籽实的有害重金属含量和3—4
(A) of the evaluation methods and pollution standards To assess the pollution of agricultural fly ash harmful substances on the soil and food, we must first determine the pollution standards and evaluation methods in order to determine whether the pollution after the ash and pollution levels. In this regard, we mainly refer to the assessment methods and standards of environmental quality in sewage irrigation areas in the southeast suburbs of Beijing and sewage irrigation districts in Tianjin. 1, the starting value of pollution: we put the ash-free control of soil and crop seed of harmful heavy metals and 3-4