比色法测定金属酞菁中钴含量的影响因素探索

摘要

选用亚硝基红盐为显色剂,采用比色法测定酞菁钴中的钴含量,考察了试样分解程度、取样量、显色时间、显色温度等因素对钴含量测定的影响,优化了测试条件,并与原子吸收法进行比较.实验结果表明,试样用量为0.02~0.10 g时,取样量对钴含量的测定影响很小;试样分解阶段,加热到溶液为蓝色时,钴离子可完全被释放;显色时间5min时基本显色完成;钴含量的测定受显色温度的影响较大,而测定温度对其基本无影响;测定时显色温度应和绘制标准曲线时的显色温度一致;亚硝基红盐比色法测定金属酞菁中钴含量简单易行,准确可靠,适用于酞菁钴中钴含量的测定.%Nitroso R salt is selected as the color reagent to determine the cobalt content in the cobalt phthalocyanine by the colorimetric method,where the effects of factors such as sample decomposition degree,the sampling amount,the developing time and the developing temperature on the determination of cobalt content are investigated,the test conditions are optimized and the comparison with the atomic absorption method is made. The results show that the cobalt content is less affected when the sampling amount is between 0.02-0.10 g;in the sample decomposition stage,when the solution is heated to blue,cobalt ions can be completely released;when the developing time is 5 min,the color reaction is basically completed;the determination of cobalt content is greatly affected by the developing temperature,while the measuring temperature imposes almost no effect on it;the developing temperature should be consistent with the temperature of plotting the standard curve when cobalt content is determined;the nitroso R salt colorimetric method is simple,accurate and reliable for the determination of cobalt content in metal phthalocyanine,and it is suitable for the determination of cobalt content in cobalt phthalocyanine.