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目的因国标第一法亚甲蓝分光光度法需大量三氯甲烷作为萃取液,用分液漏斗萃取方法耗时较长,又繁琐费力,拟研究改进,建立一种简便、灵敏、快速测定餐具表面残留烷基苯磺酸钠的方法。方法改进亚甲蓝分光光度法GB/T5750.4-2006,改用100 ml比色管代替分液漏斗,用10 ml三氯甲烷萃取液一次提取,省去p H调整和洗涤液洗涤步骤。结果本法测定烷基苯磺酸钠标准浓度在5.00~50.00μg范围内,线性良好,相关系数r=0.999 8;取50.00 ml样液测定,最低检测质量浓度为0.008 mg/L,50.00 ml样液中待测物质量为12.50μg,样液加标后测定值为32.20μg、41.50μg,加标回收率在96.70%~98.50%。结论本法与国标法实验测定结果无显著性差异,测定方法简单、快速、灵敏,适合大批量样品测定。
Purpose Due to the first method of national standard methylene blue spectrophotometry requires a large amount of chloroform as an extract, the use of separatory funnel extraction method takes a long time and tedious effort to be studied to improve the establishment of a simple, sensitive and rapid determination of tableware Method of remaining sodium alkyl benzene sulfonate on the surface. Method to improve methylene blue spectrophotometry GB / T5750.4-2006, instead of using a 100 ml colorimetric tube separatory funnel, with 10 ml of chloroform extraction once extraction, eliminating the need for p H adjustment and washing solution washing steps. Results The linearity of sodium alkylbenzenesulfonate was in the range of 5.00 ~ 50.00μg. The correlation coefficient was 0.999 8. The minimum detectable concentration was 0.008 mg / L and 50.00 ml The mass of the analyte in the liquid is 12.50μg, the measured value of the sample solution is 32.20μg, 41.50μg, the recoveries are in the range of 96.70% -98.50%. Conclusion There is no significant difference between the method and the national standard method. The determination method is simple, rapid and sensitive, and suitable for the determination of large quantities of samples.