相5和相3的形成机理研究

本文从结晶学、晶体化学和热力学的观点系统地研究了氯氧镁水泥硬化反应主要产物:相5[Mg_3Cl(OH)_5·4H_2O]和相3[Mg_2Cl(OH)_3·4H_2O]的形成与机制.相5和相3的形成主要取决于反应体系中初始反应物MgO,MgCl_2和H_2O的摩尔比.在MgO-MgCl_2-H_2O体系中,相5和相3都是不稳定的介稳相,在一定条件下,相5可以转变为相3和Mg(OH)_2,相3可转变为更稳定的Mg(OH)_2.     

COMPLEX ACTION OF SILVER-FORM CLINOPTILOLITE

By means of chemical analysis, X-ray diffraction and scanning electron micrograph, this article studies complex action which occurs on silver-form clinoptilolite and its meta-glass reacts with solutions of halogenide (except fluoride), sulphide, etc. This complex action includes the "connecting growth" crystallization of the solid sample surface and the internal salt occlusion. Compounded anions have replaceable property, and cations entered into solid sample with the anions also have replaceable property. Complex sequence is S~(2-)>I~->Br~->Cl~- and irreversible. The complex anions can be eluted by some oxidizer and the property has important significance for production.     

银型斜发沸石的复合作用

本文用化学分析、X射线粉晶衍射及扫描电子显微镜等方法,研究了银型斜发沸石及其准玻璃与卤化物(氟化物除外)、硫化物等溶液作用时所发生的复合作用.这种复合作用包括固样表面的连生结晶作用及内部的包盐作用.复合上去的阴离子具有可置换性,与阴离子一起进入固样内部的阳离子也具有可置换性.复合序列为S~(2-)>I~- >Br~-> CI~-,是不可逆的。     

FORMATION MECHANISM ON PHASE 5 AND PHASE 3

From the viewpoint of crystallography and thermodynamics the formation and phase-transformation reaction of phase 5[Mg,(OH)5Cl·4H2O] and phase 3[Mg2(OH)3Cl·4H2O] as a major resultant for the hardening reaction of magnesium oxychloride cement have been systematically investigated. It is recognized that the formation of phase 5 and phase 3 is mainly controlled by the molar ratio of MgO, MgCl2, and H2O in the initial reaction mixture. Phase 5 and phase 3 are formed by the reaction between MgO or Mg2+ dissolved out from MgO and the aqueous solution of MgCl2. In the system of MgO-MgCl2-H2O both phase 5 and phase 3 are metastable phases, and under given conditions phase 5 may transform into phase 3 and the latter also into Mg(OH)2.     

N,N-双(4''''-乙酰胺基苯并-15-冠-5)对甲苯磺酰胺萃取测定微量钾

微量钾的分光光度法测定,由于引用冠醚化合物取得了较大的进展。本文合成了一种新型双冠醚。探讨了萃取测定钾的适宜条件,共存离子的影响及络合物的组成。该法适用于自来水、河水中微量钾的测定。 1.双冠醚(BC)的合成:用30ml无水二氧六环溶解5.42g(19.2M)4＇-氨基苯并-15-冠-5后,加入4.2ml三乙胺。在N_2保护和激烈搅拌下,滴加3.09g(9.52M)N-对甲苯磺酰     

反相高效液相色谱法测定自来水中痕量十二烷基苯磺酸钠

直链烷基苯磺酸钠是常用的阴离子洗涤剂的主要成分,它对人体有害,因而生活饮用水中阴离子洗涤剂不得超过0.3mg/L。常用亚甲兰光度法和液相色谱法等测定其含量。本文以乙基紫(EV)与十二烷基苯磺酸根(DBS~-)形成离子对化合物,苯萃取富集,浓盐酸破坏离子对化合物后,乙基紫进入水相,蒸去苯后用甲醇定容,反相高效液相色谱法(RP-HPLC)测定。方法简便、灵敏。用于测定自来水中10~(-9)数量级的十二烷基苯磺酸钠的含量,结果令人满意。 实验部分 (一)仪器 美国Tracor 970A型液相色谱仪和UV检测器,美国SP4100计算积分仪。