经典的铬法分析化学需氧量（COD）时间较长，对外排（排入污水处理厂）或适时监测的样品，有一定局限性。快速消解比色法分析速度较快，对COD较高的样品分析结果准确可靠，但对COD含量小于100 mg/L的样品，快速消解比色法结果同经典的GB 11914-89铬回流法存在显著差异。通过对快速消解比色法进行改进，降低重铬酸钾标准溶液浓度，获得稳定、准确、可靠的测量结果。%The potassium dichromate method (GB 11914-89) as a typical method to determine COD value has limitation for real-time monitoring waste samples, due to its longer test time. Fast digestion-colori-metric method is more accurate and rapid when employed to determine high COD samples, while its results appear in a significant difference with the classic potassium dichromate method when applied to below 100 mg/L COD samples. Therefore, the fast digestion-colorimetric method was modified, through reducing the concentration of potassium dichromate solution, and the stable, accurate and reliable results were obtained for testing low COD samples.
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