共查询到20条相似文献,搜索用时 62 毫秒
1.
2.
3.
4.
试剂氯化钠中微量溴的离子色谱法测定 总被引:1,自引:0,他引:1
用离子色谱仪可以直接测定氯化钠中的微摄溴。操作简单快速,方法灵敏准确。一、实验部分1.仪器与试剂:Dionex 2020 i 离子色谱仪,电流检定器(银工作电极)淋洗溶液:0.2 MNa_2CO_3,用优级纯试剂配制,使用时稀释100倍。溴标准溶液:配制成1.000毫克/毫升的 相似文献
5.
6.
《应用化工》2022,(3):636-640
以Co(NO_3)_2、Zn(NO_3)_2、2-甲基咪唑和甲醇为原料制备出两种金属骨架结构材料ZIF-67和ZIF-8,并以该两种材料对碘离子进行了吸附实验,探究了溶液pH值、吸附时间、温度等因素对两种材料吸附溶液中碘离子的吸附效果及其影响。结果表明,两种材料对碘离子均在pH为7的水溶液体系中达到最大吸附量,在18 h左右达到吸附动态平衡。拟合结果表明,ZIF-67对碘离子的吸附符合Langmuir吸附等温线,ZIF-8对碘离子的吸附更符合Freundlich吸附等温线。最大吸附量分别为141.81 mg/g和474.02 mg/g。两种材料对碘离子的吸附行为更符合准一级动力学模型,吸附类型属于单分子层吸附。 相似文献
7.
8.
9.
10.
考察了在醋酸精馏过程中分别加入醋酸钾和硝酸银溶液脱除碘离子的效果,结果表明两种溶液均具有高效脱碘能力,当醋酸钾与原料液中碘离子的质量比大于10、AgNO3与碘离子的摩尔比大于化学计量比即可将碘离子脱除至很低的含量(10×10-9)。 相似文献
11.
12.
Jiehui Zeng Jianxian Zeng Hu Zhou Guoqing Liu Zhengqiu Yuan Jian Jian 《Frontiers of Chemical Science and Engineering》2020,14(6):1018
An ion-imprinted sorbent (IIP) was prepared by using Ni2+ as template, 3-[2-(2-aminoethylamino) ethylamino] propyl-trimethoxysilane as functional monomer, and silica gel as carrier. The adsorption performance of IIP towards Ni2+ was investigated. IIP showed a higher adsorption capacity than that of non-imprinted sorbent, and it also exhibited high selectivity for Ni2+ in the presence of Cu2+ and Zn2+ ions. Then, IIP was used to form a dynamic membrane onto the surface of ceramic membrane for treatment of electroplating wastewater containing Ni2+. Compared with ceramic membrane, IIP dynamic membrane had much higher steady membrane flux, and also rejected Ni2+ to obtain a lower concentration of Ni2+ in the permeate fluid. Perhaps it is suitable for future practice applications. 相似文献
13.
14.
15.
阐述了离子膜法烧碱系统中螯合树脂塔的工艺设计和生产中已出现和可能出现的问题,并介绍了解决问题的方法。 相似文献
16.
用Dionex ICS-1000离子色谱仪,Dionex AS14阴离子分离柱,以3.5 mmol/L碳酸钠-1.0 mmol/L 碳酸氢钠为淋洗液,直接进样分析食用碱中的痕量无机阴离子。该法无需样品前处理,直接进样,电导检测,高浓度碳酸钠的存在不影响痕量阴离子的测定。所测的无机阴离子的检出限均在0.012 6 mg/L以下,线性相关系数为0.998 5~0.999 8,相对标准偏差为1.153%~3.218%(n=5),回收率为93.77%~ 96.00%,符合分析测定要求。 相似文献
17.
Lecat-Guillet N Merer G Lopez R Pourcher T Rousseau B Ambroise Y 《Chembiochem : a European journal of chemical biology》2008,9(6):889-895
The Na(+)/I(-) symporter (NIS) mediates iodide uptake into thyroid follicular cells. Although NIS has been cloned and thoroughly studied at the molecular level, the biochemical processes involved in post-translational regulation of NIS are still unknown. The purpose of this study was to identify and characterize inhibitors of NIS function. These small organic molecules represent a starting point in the identification of pharmacological tools for the characterization of NIS trafficking and activation mechanisms. The screening of a collection of 17,020 druglike compounds revealed new chemical inhibitors with potencies down to 40 nM. Fluorescence measurement of membrane potential indicates that these inhibitors do not act by disrupting the sodium gradient. They allow immediate and total iodide discharge from preloaded cells in accord with a specific modification of NIS activity, probably through distinct mechanisms. 相似文献
18.
在离子膜法电解淡盐水脱氯系统取消加亚硫酸钠,保留一定量的游离氯用于在一次盐水精制中去除粗盐水中的有机物和菌藻类,进而取消加次氯酸钠。介绍了工艺改进方案、改进难点和取得的效果。 相似文献
19.
20.
The ability of the sodium/iodide symporter (NIS) to take up iodide has long provided the basis for cytoreductive gene therapy and cancer treatment with radioiodide. One of the major limitations of this approach is that radioiodide retention in NIS-expressing cells is not sufficient for their destruction. We identified and characterized a small organic molecule capable of increasing iodide retention in HEK293 cells permanently transfected with human NIS cDNA (hNIS-HEK293) and in the rat thyroid-derived cell line FRTL-5. In the presence of 3-biphenyl-4'-yl-5,6-dihydroimidazo[2,1-b]thiazole (ISA1), the transmembrane iodide concentration gradient was increased up to 4.5-fold. Our experiments indicate that the imidazothiazole derivative acts either by inhibiting anion efflux mechanisms, or by promoting the relocation of iodide into subcellular compartments. This new compound is not only an attractive chemical tool to investigate the mechanisms of iodide flux at the cellular level, but also opens promising perspectives in the treatment of cancer after NIS gene transfer. 相似文献