总有机碳(TOC)是一个综合指标,通常作为评价水体有机污染程度的重要依据.本文使用德国Elementar vario TOC测定仪,采用燃烧氧化-非分散红外吸收法,使用差减法和直接法对标准样品和我厂不同水样进行测定,通过对比两方法,明确不同TIC和TOC水样的适用方法,并表明:石化厂高浓总排、延炼废水适合使用直接法,通过控制酸化曝气时间,提高了测定准确度,并对复杂水样使用差减法和直接法相结合测定,方法准确度满足要求.
Improve the Accuracy of the Determination Results of Total Organic Carbon in Water
Total organic carbon(TOC)is a comprehensive index,which is usually used as an important basis to evaluate the degree of organic pollution in water.In this paper,German Elementar vario TOC tester was used,combustion oxidation-non-dispersive infrared absorption method was adopted,differential subtraction method and direct method were used to determine the standard samples and different water samples of our factory.By comparing the two methods,the applicable methods of different TIC and TOC water samples were clarified,and the following results were shown:High concentration total discharge and smelting wastewater in petrochemical plants is suitable for direct method.By controlling acidification aeration time,the measurement accuracy is improved.For complex water samples,the difference subtraction method is combined with direct method,and the accuracy of the method meets the requirements.
total organic carboncombustion oxidationdirect methoddifferential subtractionnon-purge organic carbon(NPOC)
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