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作者应用以下原理测定水中的碘离子(Ⅰ~-):Ⅰ~-氧化成Ⅰ_2后与共存离子分离。萃取于有机相中的Ⅰ_2再还原成Ⅰ~-被反萃取于水相中。Ⅰ~-与定量的Ag(1)形成AgI除去后,剩余的Ag(1)使之生成Ag(CN)_2~-。Ag(CN)_2~-与亚甲蓝形成离子对用二氯甲烷萃取,测其吸光度,即可求出Ⅰ~-的含量。摘要如下: 仪器:分光光度计,139型。pH计M-7型(日立-堀场)。振荡器((?))KM型。试剂:整个实验均用市售特级试剂及重蒸水。Ⅰ~-标准溶液:配制0.1 MKI溶液,用Volhard法标定。同时适当稀释。 Ag(1)标准液:取Ag_2SO_47.9 g溶于1升水中,用莫尔法标定。同时适当稀释。过氧化氢溶液:浓度为30～35%(三菱瓦斯化学)。取过氧化氢溶液适当稀释用Ⅰ_2还原法标定。用时适当稀释。
The authors applied the following principle to determine iodine ion (Ⅰ ~ -) in water: Ⅰ ~ - oxidized to Ⅰ_2 and separated from coexisting ions. I_2 extracted into the organic phase and then reduced to Ⅰ ~ - was stripped in the aqueous phase. After Ag ~ (1) is removed from Ag (1) by Ag ~ (1), the remaining Ag (1) forms Ag (CN) _2 ~. Ag (CN) _2 ~ - with methylene blue to form ion pairs extracted with methylene chloride, measured absorbance, you can find I ~ - content. The abstract is as follows: Instrument: Spectrophotometer, Type 139 pH meter M-7 type (Hitachi - Horiba). Oscillator ((?)) KM type. Reagents: The entire experiment using commercially available special reagents and re-distilled water. Ⅰ ~ - Standard solution: Prepare 0.1 MKI solution and calibrate with Volhard method. Appropriate dilution at the same time. Ag (1) standard solution: take Ag_2SO_47.9 g dissolved in 1 liter of water, with Moire method calibration. Appropriate dilution at the same time. Hydrogen peroxide solution: Concentration of 30 to 35% (Mitsubishi Gas Chemical). The appropriate hydrogen peroxide solution was diluted with Ⅰ_2 reduction method calibration. Use appropriate dilution.