杀菌灭藻剂G—4是一种优良的防霉剂及杀菌灭藻剂。对其主要成分双(5—氯—2—羟基苯基)甲烷(以下简称二氯酚)的含量测定,有多种途径:如液液萃取后的紫外定量测定法(1);薄层层析分离后的紫外测定(2);使用4—氨基比林及铁盐为氧化剂的比色法(3)等。这些方法有其优缺点,根据我所现有的分析手段,我们曾用溴代碘量法,即在酸性条件下利用一定量初生态卤素取代双氯酚中经基邻位上的氢。剩余过量的嗅能使碘化钾析出当量碘,以硫代硫酸钠标准溶液滴定,由此计算产品含量。鉴于试样杂质干扰测定,于是改用气相色谱法,在这方面曾有文 Bactericidal Algicide G-4 is an excellent fungicide and bactericidal algicide. There are many ways to determine the content of bis (5-chloro-2-hydroxyphenyl) methane (hereinafter referred to as dichlorophenol) as the main component: UV quantification after liquid-liquid extraction (1) Analytical UV (2) after separation; Colorimetric (3) using 4-aminopyrine and iron salts as oxidants. These methods have their advantages and disadvantages. Based on the analysis I have conducted, we have used brominated iodine method to replace the hydrogen at the ortho-ortho position in dicofol with a certain amount of nascent halogen under acidic conditions. The remaining excess of olfactory energy precipitates iodine equivalent potassium iodide, titration with sodium thiosulfate standard solution, thus calculating the product content. In view of the sample impurity interference determination, then switch to gas chromatography, in this regard there was text