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在PVA和阿拉伯树胶存在下,在0.3-0.6M硫酸介质中,锡(Ⅳ)与KSCN、乙基紫形成水溶性离子缔合物.λmax=580nm,摩尔吸光系数ε=9.3×10~5L.mo1~(-1).cm~(-1)。锡量在0-15μg/50ml范围内符合比耳定律.研究了40余种共存离子的影响,可用于普钢和低合金钢及某些锡矿石中微量锡的测定。
In the presence of PVA and gum arabic, tin (Ⅳ) forms a water-soluble ion association with KSCN and ethyl violet in a 0.3-0.6 M sulfuric acid medium with λmax = 580 nm and molar extinction coefficient ε = 9.3 × 10 -5 L. mo1 ~ (-1) .cm ~ (-1). Beer’s law is obeyed in the range of 0-15μg / 50ml tin.The influence of more than 40 kinds of coexisting ions is studied, which can be used for the determination of trace tin in general and low-alloyed steels and some tin ores.