亚甲蓝分光光度法测定阴离子表面活性剂的方法改进
Improvement of Anionic Surfactant Determination by Methylene Blue Spectrophotometry
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摘要: 对亚甲蓝分光光度法测定阴离子表面活性剂的方法进行了探讨,从实验步骤、试剂用量等方面作了改进,方法的检出限从0.05 mg/L降到0.02mg/L,同时减少了三氯甲烷用量。并通过校准曲线试验、标准样品测定和实际样品加标回收测定,结果表明:15 mL三氯甲烷和15mL亚甲蓝的用量完全能满足水质中阴离子表面活性剂的监测要求。Abstract: In this paper, anionic surfactant determination by methylene blue spectrophotometry was discussed. Experimental steps and reagent dosage were optimized. By use of this method, the detection limit was efficiently reduced from 0.05mg/L to 0.02 mg/L and the dose of chloroform decreased at the same time. Calibration curve was tested, precision of reference samples and recovery of practical samples were also determined. The results showed that 15 mL of chloroform and 15.0 mL of methylene blue could fully meet the requirement for monitoring of anionic surfactant in waters.
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Key words:
- Methylene Blue Spectrophotometry /
- Anionic Surfactant /
- Improvement
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