The effective factorofdetermination COD in wastewater by using spectrophotometry has been analysed. The experimental condition, precision and accuracy of this method are determined.
对影响分光光度法测废水中COD的因素进行研究，确定方法的操作条件并进行验证。
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To avoid the excessive subjectivity influenced by the conventional determination methods of weight factor, the rough set was introduced to the solution of the weight factor in the extenics evaluation.
The paper introduced the course mechanism, effecting factor, methods ofdetermination, and the effected technique of reducing loss from ammonia volatilization in paddy soil.