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据[1]报导,钙色素对测定微量钙来说是十分灵敏的试剂。当pH≈12时,钙色素与钙离子生成1∶1的较稳定的紫色络合物(在碱性介质中钙色素的水溶液是兰——紫色,与钙离子作用后变成红——紫色络合物)。考虑到有机相的挥发性影响测定准确性,本实验采用1∶2超纯HCl反萃取,后用0.5N HaOH溶液调节pH为12,然后加入钙色素,以弥补因有机相挥发带来的误差。此方法简便、准确,可以测定
It has been reported [1] that calcium pigments are very sensitive reagents for the determination of trace amounts of calcium. When pH≈12, calcium and calcium ions produce a more stable 1: 1 purple complex (in alkaline medium, the aqueous solution of calcium pigment is blue-purple, with the role of calcium ions into a red-purple Complex). Taking into account the accuracy of the determination of the volatile organic phase, the experiment using 1: 2 ultrapure HCl back extraction, with 0.5N HaOH solution to adjust the pH to 12, and then add calcium pigment to make up for the error caused by volatile organic phase . This method is simple, accurate, and can be measured