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作者提出在pH3的情况下水中硫化物将三价铁还原为二价铁,然后与1,10-菲绕啉反应产生橙红色络合物进行比色测定。对于测定水中可溶性硫化物灵敏、快速。试剂: 所有试剂都应以近期煮沸再冷却的蒸馏水配制。硫化钠标准液:于饱和硫化氢溶液中逐滴加入10%氢氧化钠至pH11,用碘量滴定法标定其浓度,临用时稀释至1毫升相当于5微克S~(2-)。
The authors propose that the sulfide in the water reduce the ferric iron to ferrous iron at pH 3 and then react with 1,10-phenanthroline to produce an orange-red complex for colorimetric determination. For the determination of soluble sulfide in water sensitive, fast. Reagents: All reagents should be prepared by the recent boiling and then cooling distilled water. Sodium sulfide standard solution: 10% sodium hydroxide was added dropwise to a saturated solution of hydrogen sulfide to pH 11, and its concentration was calibrated with iodometric titration. When diluted to 1 ml, it was equivalent to 5 micrograms of S 2- (2-).