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金与亚硫酸铵是无氰镀金液中的主要化验项目。用原子吸收法可直接进样分析金含量。亚硫酸铵的含量采用碘量法与原子吸收相结合的方法,可以同时测定游离亚硫酸铵,还可免去使用As_2O_3。用配制试样核实方法的精度,相对误差在5%以内。试剂与仪器 0.1N碘溶液:称取碘13g,碘化钾40g,溶解于少量水中,稀释至1000ml。保存于棕色瓶中。 0.05N硫代硫酸钠标准溶液。原子吸收分光光度计:750型,苏州267厂生产。分析方法 1 金含量的分析采用波长242.8nm金的共振线,在满足仪器要求光强度的灯电流,贫燃的空气/乙炔火焰里,平行地测定金标准溶液与合适稀释度的样品的吸光度,绘制标准曲线,从此曲线上算出金的浓度。并计算出与金相结合的亚硫酸铵之数量。 2 总亚硫酸铵之测定在锥形瓶中加入0.5ml电镀液,25ml碘溶液,用
Gold and ammonium sulfite are the main test items in cyanide-free gold plating solutions. With atomic absorption method can be directly injected for analysis of gold content. Ammonium sulphite content by iodometric method combined with atomic absorption method can be simultaneously measured free ammonium sulphite, but also avoid the use of As_2O_3. With the preparation of sample verification accuracy of the method, the relative error within 5%. Reagents and equipment 0.1N iodine solution: Weigh iodine 13g, potassium iodide 40g, dissolved in a small amount of water, diluted to 1000ml. Save in brown bottle. 0.05N sodium thiosulfate standard solution. Atomic absorption spectrophotometer: 750, Suzhou 267 plant production. Analysis Method 1 Analysis of Gold Content The absorbance of a gold standard solution and a sample of a suitable dilution was measured in parallel in a lamp current that satisfies the required light intensity of the instrument, a lean air / acetylene flame using a resonance line with a wavelength of 242.8 nm, Draw a standard curve and calculate the gold concentration from this curve. And calculate the amount of ammonium sulfite combined with the gold. 2 Determination of total ammonium sulfate Add 0.5ml plating solution in a conical flask, 25ml iodine solution, with