水溶性聚合物和两亲聚合物:14.丙烯酰胺/2-丙烯酰胺基十六烷磺酸铵无规共聚物

水溶液中用硫酸亚铁-异丙苯过氧化氢氧化还原引发体系合成了丙烯酰胺(AM)/2-丙烯酰胺基十六烷磺酸铵(AMC_(16)SNH_4)无规共聚物。用元素分析、IR、~(13)C-NMR和~1H-NMR对其进行了表征。对水溶液性质的研究结果表明,与部分水解聚丙烯酰胺相比,这种新型共聚物有着优异的耐盐性、耐温性和贮存稳定性。     

The development of an automated HPLC system for the determination of trace-metals in concentrated brines and its application to process monitoring

Methodology based on high performance liquid chromatography (HPLC) has been developed for the determination of trace-metals in concentrated brines. Metal ions, (Al, Ba, Ca, Mg, Sr and Zn) were concentrated quantitatively and isolated from the sodium chloride matrix using a chelating ion-exchange column dynamically coated with the chelating dye xylenol orange. The pH dependence of the uptake of the metals was studied. Using the chelating ion-exchange preconcentration column followed by ion chromatography all the metals studied were determined at the low ng ml^–1 level in concentrated brines and linear/workable calibrations were obtained in the concentration range of interest (<100 ng ml^–1). The methodology developed was successfully transferred to an automated on-line monitoring system for the determination of Ba, Ca, Mg and Sr in concentrated feed brines used in the chlor-alkali industry.     

盐卤硼酸盐化学——Ⅺ.不同含硼浓缩盐卤的稀释实验

前文[1]报道高含硼浓缩盐卤加水稀释过程中硼酸盐的行为。考虑到青海省柴达木盆地大柴旦盐湖卤水日晒蒸发到钾盐析出阶段,浓缩卤水中含1.87％MgB_4O_7,蒸发到水氯镁石开始析出,浓缩卤水中含2.95％MgB_4O_7。本文报道,这两种不同含硼浓缩卤水按文献[1]中实验步骤进行加水稀释,室温放置过程中析出硼酸镁盐的某些不同结果。     

On the Reliability of Numerical Solutions of Brine Transport in Groundwater: Analysis of Infiltration from a Salt Lake

The density dependent flow and transport problem in groundwater is solved numerically by means of a mixed finite element scheme for the flow equation and a mixed finite element-finite volume time-splitting based technique for the transport equation. The proposed approach, spatially second order accurate, is used to address the issue of grid convergence by solving on successively refined grids the salt lake problem, a physically unstable downward convection with formation of fingers. Numerical results indicate that achievement of grid convergence is problematic due to ill-conditioning arising from the strong nonlinearities of the mathematical model.     

偏钛酸型锂离子交换剂的交换性质及从气田卤水中提取锂

偏钛酸型锂离子交换剂的交换性质及从气田卤水中提取锂     

盐卤硼酸盐化学——Ⅺ.不同含硼浓缩盐卤的稀释实验

In this paper, we have studied on the behaviour of borate during dilution of different boron-containing concentrated brines in which the boron-concentrations are lower than that brine used in the article reported and obtained some interesting results which have never found in any reference before.     

Migration,Crystallization and Dissolution Changes of Salt Solution with Color Rendering Property in Porous Quartz Materials

In order to visually display the migration and crystallization process of salt solution in porous cultural relics, copper sulfate solution with color rendering property was selected to record the migration, crystallization and resolution of salt solution in simulated SiO₂ samples under different environmental conditions in real time through high-resolution recording system, scanning electron microscope system, salt phase X-ray diffraction system, and so on. The results showed the migration of salt solution in porous samples was related to the structural characteristics of the porous samples, the migration rate of salt solution, the evaporation rate and the change frequency of crystallization–resolution, etc., in which the large pore size of the sample, the higher the concentration and the faster migration and evaporation rate of salt solution, the greater the change rate of the brine accumulation zone or salt crystallization zone in the different porous samples. During the humidification–drying cycles of rainfall, the higher the cycle frequency of humidification–drying was, the higher the drying temperature was, the more frequent the crystallization-analysis change of salt in the salt-bearing sample was, and the more extensive the distribution of salt crystal zone was. This is the first time to visualize the salt belt by simulating the changing process of a salt solution with a color rendering property in porous samples. This has scientific theoretical guidance for the study of the migration–crystallization changes of soluble salts contained in porous silicate cultural relics. The visibility analysis results of multilayer salt crystal belts can also provide the preliminary basis for further effective desalination of salt bearing cultural relics.     

溴与其他卤族元素及卤水溴、氯含量与矿化度的相关关系

研究了地下卤水、土壤、食品和人体组织中Br与其他卤族元素,以及卤水Br、Cl含量与矿化度的相关关系.结果表明,Br与Cl及Br与Ⅰ呈显著正相关关系,其他卤族元素间无显著相关性;Br与矿化度及Cl与矿化度高度相关.利用建立的各类卤水的回归模型,评估了“浓缩均衡矿物滴”(CMD)的盐卤属性.