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2004年5月21日颁布的中华人民共和国国家职业卫生标准工作场所空气有毒物质测定GBZ/T160-2004中部分方法在应用的过程中存在一些值得商榷的问题,在此提出与标准研制单位和应用单位的同行交流。1氰化物测定方法 1.1吸收液的浓度问题GBZ/T160.29-2004[1]中氰化物的测定采用异菸酸钠-巴比妥酸钠分光光度法,方法中规定采样吸收液为40 g/L的氢氧化钠溶液,中和时使用5%(V/V)的乙酸,样品和标准曲线均为10 ml定容体积,但因碱的浓度过高,酸的浓度过低,中和后加入缓冲液、氯胺T和显色剂,总体积达到11.8 ml,超过了
May 21, 2004 promulgated the National Occupational Health Standards of the People’s Republic of China workplace air toxic substances GBZ / T160-2004 part of the method in the process of application there are some questions to be discussed, proposed here with the standard development units and applications Unit of peer exchange. 1 Determination of cyanide 1.1 Absorption of liquid concentration problems Determination of cyanide GBZ / T160.29-2004 [1] using sodium isonicotinate - barbital sodium spectrophotometry, the method provides sampling absorption solution of 40 g / L of sodium hydroxide solution. 5% (V / V) acetic acid was used for neutralization. The volume of sample and standard curve was 10 ml. However, the concentration of alkali was too high, the concentration of acid was too low, the neutralization After adding buffer, chloramine T and developer, the total volume reached 11.8 ml, exceeded