论文部分内容阅读
选取氨水-氯化铵溶液,使锌粉中氧化锌溶解,再加入某些抑制反应剂如亚硫酸钠,聚乙烯醇,控制在一定的温度,一定的摇动时间处理试样,能有效地把锌粉中的氧化锌分离,然后用极谱法或EDTA滴定法测定氧化锌的含量。一仪器与试剂 JP-1A 型示波极谱仪混合溶剂:10克Na_2SO_3,20克NH_4Cl加460ml水,35ml浓氨水,5ml聚乙烯醇(0.2%)。锌标准溶液:0.5mg Zn ml~(-1)或0.6724mg ZnOml~(-1),称500mg纯锌,加20ml HCl(1+1)溶解,移入1升量瓶中,以水稀至刻度。二操作步骤称200mg锌粉于烧杯中,准确加入50ml混合溶
Ammonia - ammonium chloride solution is selected to dissolve the zinc oxide in the zinc powder, and then some inhibitory reactants such as sodium sulfite and polyvinyl alcohol are added to control the sample at a certain temperature for a certain shaking time, so that the zinc powder Zinc oxide in the separation, and then polarography or EDTA titration method for the determination of zinc oxide content. An instrument and reagent JP-1A oscillopolarographic mixed solvent: 10 g Na_2SO_3, 20 g NH_4Cl plus 460ml water, 35ml concentrated ammonia, 5ml polyvinyl alcohol (0.2%). Zinc standard solution: 0.5mg Zn ml ~ (-1) or 0.6724mg ZnOml ~, weighed 500mg pure zinc, add 20ml HCl (1 + 1) dissolved, transferred to 1 liter volumetric flask, diluted with water to the mark . Two steps that 200mg zinc powder in a beaker, accurately add 50ml mixed solution