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研究了由硝酸铝和柠檬酸组成磷酸盐的特效螯溶剂，当溶解羟磷灰石伴生碳酸盐时的同步螯溶反应机理。控制螯溶待测液中柠檬酸溶液的极限浓度，防止差示光度法中钼黄显色的抑制影响；应用盐酸系统钒钼酸铵显色剂，避免氯离子对钼黄显色的干扰；钙、氯离子对钼黄显色的干扰由柠檬酸根螯合、铝离子配合作用以消除。结果表明，高磷试样的差示比色测定的绝对误差小于０３４％；低磷试样的普通比色测定的绝对误差小于０１５％。
The effect of the synchronous chelation reaction when dissolving the hydroxyapatite associated carbonate was investigated as a special effect chelating agent consisting of phosphate nitrate with aluminum nitrate and citric acid. Control the concentration of citric acid solution in the solution to be tested to prevent the molybdate yellow from being inhibited by the spectrophotometric method; and avoid the interference of chloride ion on the color of molybdenum yellow when applying hydrochloric acid system vanadium molybdate reagent, Calcium, chloride ion molybdenum yellow color interference by citrate chelation, with the role of aluminum ions to eliminate. The results showed that the absolute error of the differential colorimetric determination of high phosphorous samples was less than 034%, and the absolute error of ordinary colorimetric determination of low phosphorous samples was less than 015%.