我国是农业大国，尿素的使用量极大，但是也造成了土壤与水质等方面的污染。溶液中尿素含量在1%以上，用对二甲氨基苯甲醛比色法测定时，能够准确、快捷、操作简便。但当对二甲氨基苯甲醛比色法在测定水中微量尿素时，方法重现性较差。为了有效监控生产和确保回收水质的合格率，以及控制今后的分析数据在误差允许的范围内，将对二甲氨基苯甲醛比色法进行适当改进，可大大提高该方法的灵敏度和准确度。%China is a large agricultural country, a great amount of urea are used, it causes soil and water quality pollutions. When urea content is above 1%, the using of dimethylamino-benzaldehyde method is more accurate, quick, simple operation. dimethylamino-benzaldehyde colorimetry in the determination of trace urea of reproducibility is poor, sample recovery rate is low, not conducive to guide the production process. In order to effectively monitor the production, and ensure the quality of the qualified rate of recovery and control the future of the analysis of the data in the error within the allowable range, dimethyl-amino-benzaldehyde colorimetry was improved properly, it can greatly improve the sensitivity and accuracy. The method of optimal conditions was studied through the different conditions of dimethylamino-benzaldehyde colorimetry.
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