Results 91 to 100 of about 169,893 (149)

[Determination of six whitening ingredients in cosmetics by ultra performance liquid chromatography coupled with photodiode array detector and corona charged aerosol detector]. [PDF]

Se Pu
Li X, Wang Y, Fan F, Zhou W, Chen B, Shi H, Cai G, Liu Y, He Y.   +8 more
europepmc   +1 more source

[Determination of eight ultraviolet absorbers in surface water and wastewater by ultra performance liquid chromatography-triple quadrupole mass spectrometry]. [PDF]

Se Pu
Sun HJ, Zhang BB, Huang MQ, Wang H, Hu GJ, Chen HM.   +5 more
europepmc   +1 more source

顺式-3,3-二甲基-2-(1′-羟基-2′,2′,2′-三溴乙基)-环丙烷-1－羧酸的制备方法

, 1999
一种顺式－３，３－二甲基－２－（１′－羟基－２′，２′，２′－三溴乙基）－环丙烷－１－羧酸的制备方法是蒈醛与ＣＨＢr3在强碱作用下，发生亲核加成反应，且碱使用ＫＯＨ－ＣＨ３ＯＨ为碱介质，亲核加成反应是在加入有机溶剂的条件下进行的，反应温度为１０～３０℃，有机溶剂量为反应物的１～１０倍。有机溶剂可采用四氢呋喃、二氧六环或乙二醇二甲醚。该方法中可在常温下即可得到较高的产物收率，因此适于在工业生产中应用 ...
曹国英, 胡信全, 姚小泉, 潘桂芝, 韩梅   +4 more
core  

[Determination of 31 perfluoroalkyl and polyfluoroalkyl substances in water by ultra performance liquid chromatography-triple quadrupole mass spectrometry combined with direct injection]. [PDF]

Se Pu
Yang C, Li P, Zhang Y, Wang L, Hou M, Shi Y, Cai Y.   +6 more
europepmc   +1 more source

一种衣康酸基环状硅骨架环氧树脂、制备方法及其作为基体树脂制备涂料的应用

, 2016
本发明公开了一种衣康酸基环状硅骨架环氧树脂、制备方法及其作为基体树脂制备涂料的应用，所述环氧树脂为衣康酸亚甲基(式2官能团)单取代或多取代的多元环硅氧烷；为衣康酸二缩水甘油酯、环硅氧烷在铂催化剂催化下的加成产物。本发明提供的环氧树脂具有优异的柔韧性；且不会大幅度降低甚至可以保持材料的刚性。采用的衣康酸二缩水甘油酯为生物可再生资源，产物性能可以通过投料配比调控 ...
刘小青, 马松琪, 朱锦, 康文涛, 李鹏, 江艳华   +5 more
core  

[Determination of perfluorinated compounds， antibiotics and pesticides in drinking water by automated solid phase extraction with ultra-performance liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Liang J, Feng J, Zeng D, Zhou L, Zhong X, Li Y, Chen D.   +6 more
europepmc   +1 more source

水中直链烷基苯磺酸盐同系物的高速液相色谱法测定

, 1986
用高效液相色谱法分析了环境标准品和湖水中LAS的烷基同系物的组成,并比较了几种商品级LAS中同系物的比例。用YWG-CH作为固定相和含高氯酸钠的甲醇水溶液为流动相达到LAS同系物较好地分离。成功地用732阳离子交换树脂吸附除去萃取液中的亚甲基蓝。方法的回收率为95.01％,标准差±2.97,最低检出量10ng ...
谭渝云,张甬元
core  

[Preparation of mesoporous covalent organic framework core-shell stationary phase and its application in the analysis of astragaloside Ⅳ content in <i>Astragalus</i>]. [PDF]

Se Pu
Zhao XY, Jin JY, Liu XJ, Yan LJ, Yang SY, Zhang ZW, Zhang LY, Wu RF.   +7 more
europepmc   +1 more source

一种分解环烷基过氧化氢水溶性催化剂体系及应用

, 2014
本发明涉及一种分解环烷基过氧化氢水溶性催化剂体系，该体系主要由金属离子和酸根离子组成，该种催化剂体系能够在非碱性油水两相搅拌条件下 ...
 郑玺,  徐杰,  苗虹, 孙志强   +3 more
core  

[Determination of seven tire antioxidants and their quinone oxidation products in fine particulate matter by high performance liquid chromatography-tandem mass spectrometry]. [PDF]

Se Pu
Liu F, Tang BB, Wu LY, Song LX, Zhang M, He M.   +5 more
europepmc   +1 more source