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表面活性剂能提高铬天莆S(CAS)与铝显色反应的灵敏度和对比度,为痕量铝的测定提供了条件.资料采用氟化铵将比色体系褪色后作参比液,消除了有色离子镍的干扰.但对高纯镍中痕量铝的测定,由于大量镍的存在,采用褪色参比液仍有困难.我们试验了苯甲酸盐萃取铝,与大量镍分离,拟定的方案可以测定高纯镍中痕量铝(2×10~(-4)%).
Surfactants can improve the sensitivity and contrast of the chromogenic reaction of chromium-Tian-Pu S (CAS) with aluminum, and provide the conditions for the determination of trace aluminum.Using ammonium fluoride to fade the colorimetric system as the reference solution, However, the determination of trace amounts of aluminum in high-purity nickel is still difficult due to the presence of a large amount of nickel because of the fading of the reference solution.We tested the extraction of aluminum with benzoate and separation from a large amount of nickel, Determination of trace nickel in high purity nickel (2 × 10 ~ (-4)%).