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甲基百里酚蓝(简称MTB)在络合滴定法中作为金属指示剂而得到广泛的应用.在分光光度分析中,国内已用于镁、铍、铝等的测定,而对于胶束增溶分光光度法的研究,目前还限于镍、稀土等少数元素.我们对溴化十六烷基三甲铵存在下用MTB测定钙的方法进行了试验,发现在强碱性条件下,CTMAB能使MTB的颜色从原来的蓝紫色褪成灰黄色,并和Ca—MTB形成稳定的蓝色铬合物.试剂空白值有了很大降
Methylthymol blue (referred to as MTB) has been widely used as a metal indicator in complexometric titration.In the spectrophotometric analysis, the domestic has been used for the determination of magnesium, beryllium, aluminum, etc., The study of the spectrophotometric method is still limited to a few elements such as nickel and rare earth.We tested the method of MTB determination of calcium in the presence of cetyltrimethylammonium bromide and found that under the condition of strong alkalinity, The color of MTB faded from the original blue-violet to the yellow-blue color and formed a stable blue complex with Ca-MTB.