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目的:建立酸碱滴定法测定磷酸钠盐灌肠液的含量。方法:加入0.5 mol·L~(-1)氢氧化钠溶液,使溶液成分为PO_4~(3-)与HPO_4~(2-),用0.5mol·L~(-1)盐酸滴定液滴定至两个等当点,测定磷酸钠盐灌肠液中磷酸二氢钠与磷酸氢二钠的含量。结果:第一个等当点pH为9.2,第二个等当点pH为4.4,磷酸二氢钠的平均回收率(n=6)为100.2%,RSD为0.80%;磷酸氢二钠的平均回收率(n=6)为101.5%,RSD为0.94%。结论:本法简便、快速、准确。
Objective: To establish the acid-base titration method to determine the content of sodium phosphate salt enema. Methods: 0.5 mol·L ~ (-1) sodium hydroxide solution was added to make the solution of PO_4 ~ (3-) and HPO_4 ~ (2-) titrated with 0.5 mol·L ~ Two equivalent points, determination of sodium phosphate sodium phosphate dihydrogen phosphate and disodium hydrogen phosphate content. Results: The first equivalence point was 9.2 and the second equivalence point was 4.4. The average recovery of sodium dihydrogen phosphate (n = 6) was 100.2% and the RSD was 0.80%. The mean The recovery (n = 6) was 101.5% with a RSD of 0.94%. Conclusion: This method is simple, fast and accurate.