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催化比色测定铱时镍盐对消除铑的干扰有特殊抑制作用已经得到证实。本文进一步指出镍盐也可抑制铂的干扰,可在无需进行任何分离手续的情况下用催化比色法测定铱。镍盐还可使工作曲线变直。试验还证实了可用硫酸锂-硫酸钠混合物作熔剂,从而避免了硫酸锂-焦硫酸钠的制备,方便了使用。经两年多来的生产实践考验,方法简便快速,相对误差<10%。
Catalytic colorimetric determination of iridium nickel salt to eliminate rhodium interference has a special inhibitory effect has been confirmed. This paper further points out that nickel salts can also inhibit the interference of platinum, and the iridium can be determined by catalytic colorimetry without any separation procedure. Nickel salt can also make the working curve straighten. The test also confirmed the available lithium sulfate - sodium sulfate mixture as a flux, thus avoiding the lithium sulfate - sodium pyrosulfate preparation, easy to use. After more than two years of production practice test, the method is simple and fast, the relative error <10%.