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本方法主要针对高温耐热合金中铁、镍基体的影响,以常见的亚硝基R盐为显色剂,在弱酸性介质中(pH5～6),与钴形成稳定的红色络合物,进行比色测定. 在铁、镍基体的影响中,铁的影响最大,方法采用亚硝酸钠氧化(使Fe~(2+)氧化成Fe~(3+)),柠檬酸铵络合(Fe~(3+)),消除铁的干扰,室温下(不煮沸)直接进行显色。显色溶液中,铁、镍基体影响被消除,0.35毫克铜、
The method is mainly aimed at the effect of iron and nickel matrix in high-temperature heat-resistant alloy. With common nitrosyl R salt as chromogenic agent, a stable red complex with cobalt is formed in weak acid medium (pH5 ~ 6) The colorimetric determination showed that iron had the most significant effect on the iron and nickel matrix by the oxidation of sodium nitrite (Fe ~ (2+) to Fe ~ (3+)), ammonium citrate complexation (Fe ~ (3+)) to eliminate iron interference, direct color development at room temperature (not boiling). Color solution, iron, nickel matrix effect is eliminated, 0.35 mg copper,