用浓硫酸和过氧化氢消化样品,以三乙醇胺和乙酰丙酮联合掩蔽干扰离子,偶氮氯膦Ⅰ作显色剂,分光光度法测定钙,与EDTA配位滴定法比较,效果较好. The samples were digested with concentrated sulfuric acid and hydrogen peroxide. The interference ions were masked with triethanolamine and acetylacetone. Chlorophosphonazo I was used as the chromogenic reagent. The spectrophotometric method was used to determine calcium, which was better than EDTA titration.