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本法以含镍试样在碱性条件下用三乙醇胺隐蔽干扰离子,加过量EDTA,用氯化钙溶液进行回滴,并用钙黄绿素作指示剂,在滴定过程中,首先通过光电转换系统将溶液中荧光的出现及其强度的增高转变为光敏电阻阻值的变化,随后通过电子电路放大和调整为相应的电压讯号输出,最后籍ZD-2型自动电位滴定计实现滴定终点的自动控制。 对方法和仪器进行了被测溶液底色,温度的影响;室温对光敏电阻的影响,滴定位置、各种液体指示剂以及共存元素干扰等条件试验,试验果结、证明本装置电子电路简单可靠,适用范围广,测定准确,可直接用于日常分析中镍的自动滴定,同时也为进一步实现全自动测定镍提供了良好基础。分析方法在Cr40毫克、Co26毫克,Mn10毫克没有干扰。
In this method, nickel-containing sample is covered with triethanolamine in alkaline condition to conceal the interfering ions, add EDTA in excess, drop back with calcium chloride solution and use calcein as an indicator. During the titration process, firstly, The emergence of fluorescence in solution and the increase of its intensity into a change in the value of the photoresistor resistance, and then amplified and adjusted by the electronic circuit to the corresponding voltage signal output, the last ZD-2-type automatic potentiometric titration endpoint titration automatic control. The methods and instruments were tested under the background color, temperature; Room temperature effect on the photoresistor, titration, various liquid indicator and the interference of coexisting elements and other conditions test, the test results show that the device is simple and reliable electronic circuit , A wide range of applications, accurate determination, can be used directly for routine analysis of nickel automatic titration, but also for the further realization of fully automated determination of nickel provides a good foundation. Analytical methods Cr40 mg, Co26 mg, Mn10 mg did not interfere.