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目的研究相同浓度磷酸、乙酸、硼酸作为缓冲液对聚维酮碘溶液中pH的影响。方法通过设置四组不同缓冲溶液,观察不同缓冲液对PVP- I溶液中pH值的影响。结果四组缓冲液在相同时间、环境内对PVP- I溶液中pH值的影响均不同。结论以磷酸、氢氧化钠的缓冲溶液为4.41对PVP- I溶液中pH影响较小。“,”OBJECTIVE: To observe the influence of pH on the content of available iodine in providone solution. METHODS:The pH and available iodine in intermediates and final product of providone were detected and the contents of available iodine before and after adjusting pH were compared. RESL 比 TS: Providone solution was unstable in alkaline condition and the content of available iodine gradually decreased with the rise in pH·(:ON(:LUSION:In productive process, 120% of the labeling quantity of iodine lime should he fed to make sure that the intermediates contain not less than 110% of the labeling amount of iodine, and the pH of intermediates should he control ed in the range of 5. 0- 6.0.