Development of Visual Measurement for Aqueous Pollutants Using a Thixotropic Gel

本研究的目的是建立一种简便的医疗用消毒药物的测定方法。制备了触变凝胶n -月桂酰- l-谷氨酸-α， γ-二丁酰胺（LGBA），并以该凝胶为表面活性剂的提取和着色介质，以及对废水、部分环境水等的消毒药物进行了目测。(1)阴离子表面活性剂（AS）：将LGBA溶解于邻二氯苯中，制得触变性凝胶。在凝胶中加入AS溶液和亚甲基蓝溶液，振动混合。然后通过凝胶的颜色和光谱学测定其AS浓度。对于吸光度A对AS浓度[AS]的响应，在0.03 ~ 2.0mg/L的AS浓度（655.5 nm）范围内，A=0.602[AS]呈直线关系。0.2 mg/L AS时，测定值的相对标准偏差（RSD）为2.8%。(2)非离子表面活性剂（NIS）：NIS溶液与K^+、七烷基醇单十二基醚混合。将混合物和TBPE加入凝胶中，然后将质谱提取到凝胶中。然后测定质谱。在614 nm， MS浓度为0.005 ~ 2.0mg/L时，吸光度与MS浓度的关系为A=520[NIS]。当NISs浓度为0.1 mg/L和0.4 mg/L时，测定值的变化幅度分别为6.3%和4.7%，RSD值的变化幅度较小。(3)消毒药物（葡萄糖酸氯己定，CG）：在凝胶中加入CG溶液和TBPE溶液，提取CG。然后确定了CG。在607.5 nm， CG浓度为0.9 ~ 5.4mg/L时，吸光度与CG浓度的关系为A=0.109[CG]。当CGs浓度为1.80 mg/L和4.50 mg/L时，测定值的变化幅度分别为5.5%和2.5%，RSD分别为0.75%和0.75%。

The purpose of this research is to develop a simple determination method of the disinfection medicine for the medical treatment. Thixotropic gel, N-Lauroyl-L-glutamic-α, γ-dibutylamide (LGBA) was prepared, and then a visual measuring methods was examined using the gel as an extracting and coloring medium for the surfactants, and disinfection medicine for waste water, some environmental water, and so on.(1) Anionic surfactant(AS) :LGBA was dissolved in o-dichlobenzene, and thixotropic gel was prepared. A AS solution and methylene blue solution were added into the gel, and it was mixed with a vibration. And then, AS concentration was determined from the color of the gel by visual and spectroscopy. For the response of absorbance, A, against AS concentration, [AS], on a spectrophotometry, a straight line relation, A=0.602[AS], was obtained in 0.03-2.0mg/L of AS concentration at 655.5 nm. The variation of the determined values was 2.8% with a relative standard deviation (RSD) for 0.2 mg/L of AS.(2) Nonionic surfactant(NIS) :NIS solution, K^+, and heptaglycolmonododecylether were mixed. The mixture and TBPE was added with a gel, and then MS was extracted into the gel. And then MS was determined. A relation between the absorbance and MS concentration was A=520[NIS] in 0.005-2.0mg/L of MS concentration at 614 nm. The variations of the determined values were 6.3 and 4.7% with RSD, respectively, for 0.1 and 0.4 mg/L of NISs.(3) Disinfection medicine (chlorhexidine gluconate, CG):A CG solution and TBPE solution were added into a gel, and CG was extracted. And then CG was determined. A relation between the absorbance and CG concentration was A=0.109[CG] in 0.9-5.4mg/L of CG concentration at 607.5 nm. The variations of the determined values were 5.5 and 2.5% with RSD, respectively, for 1.80 and 4.50 mg/L of CGs.