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戊二醛作为一种广谱、高效的消毒剂在医疗、食品处理等方面的应用越来越广泛。常用浓度为1%~2%,其含量测定常采用间接碘量法,即先以过量还原剂(常用亚硫酸盐)与戊二醛作用,剩余的还原剂以碘标准溶液中和,根据空白与样液所消耗的碘量按下式计算样液中戊二醛含量:戊二醛(%)=((M×(V_1-V_2)×100.12)/(2S×1000))×100其中M为所用碘标准液的浓度(mol/L),V_1、V_2分别为蒸馏水及样液所消耗的碘液量(ml),S为样液量(ml或g),其中规定加入NaHSO_3的量为0.25mol/L20ml,取样量为1ml,如此测定样液,需消耗的碘液多,V_1与V_2之差很小,给操作者增加了工作量,从分析化学方面来看,也是没必要的。本文根据实际情况,将方法作如下两处调整:
Glutaraldehyde is widely used as a broad-spectrum and highly effective disinfectant in medical treatment and food processing. Commonly used concentration of 1% to 2%, its content determination often used indirect iodization method, that is, the first with excess reductant (commonly used sulfite) and glutaraldehyde, the remaining reductant neutralized with iodine standard solution, according to the blank The amount of iodine consumed in the sample solution is calculated as follows: glutaraldehyde (%) = ((M × (V_1 -V_2) × 100.12) / (2S × 1000) × 100 where M Is the concentration of iodine standard solution used (mol / L), V_1 and V_2 are the amount of iodine solution consumed in distilled water and sample solution respectively (ml), S is the amount of sample solution (ml or g), which specifies the amount of NaHSO_3 added 0.25mol / L20ml, sampling volume of 1ml, so the determination of sample solution, the need to consume more iodine, V_1 and V_2 difference is small, to the operator to increase the workload, from the analytical chemistry point of view, is not necessary. This article based on the actual situation, the method for the following two adjustments: