论文部分内容阅读
目的对GB/T 5750.4—2006中阴离子合成洗涤剂检测方法进行改进优化,提高检验时效。方法改多步萃取为一步离心萃取:一次性定量加入待测水样、5 ml氯仿和10 ml亚甲蓝溶液于50 ml尖底离心管中,具塞,强力振摇1 min后置于离心机中,在2 500 r/min离心5min进行分离萃取,紫外分光光度法测定氯仿层,检测波长650nm。结果十二烷基苯磺酸钠在0～1 mg/L范围内呈良好的线性关系,r=0.999 9,平均回收率为100.8%(n=9,RSD=2.1%);与国标法相比差异无统计学意义。结论优化后的测定方法减少了萃取溶剂的用量,缩短了样品处理时间,操作简单、快速、分离效果好,结果准确可靠,可以极大地提高检验效率。
OBJECTIVE To improve and optimize the detection method of anionic synthetic detergent in GB / T 5750.4-2006 to improve the test aging. The method of multi-step extraction for one-step centrifugal extraction: a one-time quantitative to join the water to be tested, 5 ml of chloroform and 10 ml of methylene blue solution in 50 ml sharp bottom centrifuge tube, with a plug, strong shaking 1 min after centrifugation Machine, centrifuged at 2500r / min for 5min for separation and extraction, and the chloroform layer was measured by UV spectrophotometry with a detection wavelength of 650nm. Results Sodium dodecyl benzene sulfonate showed good linearity in the range of 0 ~ 1 mg / L, r = 0.999 9, the average recovery was 100.8% (n = 9, RSD = 2.1%). Compared with the national standard method The difference was not statistically significant. Conclusion The optimized determination method can reduce the amount of extraction solvent, shorten the sample processing time, simple and fast operation, good separation effect and accurate and reliable results, which can greatly improve the test efficiency.