海水中铜与水合氧化钛无机离子交换反应的研究

Keen曾报道海水中水合氧化钛能与十几种元素发生离子交换作用，其中包括了铜，但它在“微量元素”中，其富集系数属最小的。我们已经研究过海水中铬(Ⅲ)和铀(Ⅵ)在水合氧化钛上的离子交换反应，它们的富集系数则在十几个元素中     

海洋资源的化学Ⅳ水合磷酸氢钛的合成及其对海水中钾离子的交换性能

引言 从海水中直接提取钾盐是海水资源化学的重要研究课题之一。海水中的钾以K2O估算，总储量达580万亿吨，如此丰富的钾资源取之不尽用之不竭，引起了人们对海水提钾的兴趣。但是，海水中钾的浓度仅约380毫克／升左右，且有将近30倍的钠离子共存，这就使用较低的成本从海水中提取钾盐成为难题。     

水合氧化锆吸附硼的pH效应与机理

研究了水合氧化锆吸附硼的pH效应。研究结果表明:体系pH值对海水中硼的吸附影响很大;对纯硼酸液中硼的吸附影响较小。并提出可能的吸附机理:低pH值时,以物理吸附为主;高pH值时,以化学吸附为主。     

添加氧化铁废渣和锰矿粉净化虾池底质的研究

本文就有关用含铁炉渣可改善虾池底质技术及效果进行研究。 1 材料和方法 1.1 底质泥样的采集和分离 于1991年5月3日和5月9日分别在厦门高崎和同安西柯虾池及毗邻的滩涂采集表层沉积物,密封于聚乙烯盒中,运回实验室用角质药匙挖取代表性泥样,装     

现代黄河三角洲ZK226孔岩心~(210)Pb、Al、Fe、Mn和Cu的地球化学

现代黄河三角洲ZK226孔岩心的~(210)Pb、Al、Fe、Mn和Cu的地球化学表明,沉积物的粒度是控制上述元素的主要因素,这些元素与粒度的相关性是~(210)Pb>Fe>Al>Mn>Cu。粘土和Fe的水合氧化物是吸附~(210)Pb的主要组分。标准化后的~(210)Pb_ex,与Al、Fe,Mn和Cu的比值对黄河中上游流域的土壤侵蚀情况具有良好的指示意义,这为建立黄河中上游流域的土壤侵蚀模式打下了必要的基础。     

盐酸羟胺—柠檬酸体系提取土壤中的游离氧化铁

对盐酸羟胺柠檬酸体系（９５℃水浴加热）提取土壤中游离氧化铁的实验条件进行了研究。在所选的实验条件下,该体系对土壤中游离氧化铁的提取能力与常用的连二亚硫酸钠柠檬酸钠重碳酸钠（ＤＣＢ法）体系相当,但避免了ＤＣＢ法中引入Ｎａ２Ｓ２Ｏ４给随后分离和测定造成的沉淀、基体效应等各种弊端。方法的精密度较好,ＲＳＤ（ｎ＝６）为２．５％～３．０％。     

离子固化剂改性蒙脱土水合-孔隙关联演化机制

以天然钙蒙脱土为研究对象,采用不同浓度的离子固化剂对其进行改性处理,开展素土与改性蒙脱土在相对湿度（P/P0）0～0.95区间的水汽等温吸-脱附试验,通过吸附速率曲线、晶层间距d001值变化曲线分析蒙脱土水合机制,并采用蒙脱土孔隙比变化曲线关联分析水合-孔隙演化规律,提出不同尺度孔隙吸附水的界限相对湿度区间。在此基础上,基于X射线衍射(XRD)、氮气吸附以及压汞试验对离子固化剂改性蒙脱土水合过程的孔隙分布特征进行验证分析。试验结果表明：对于钙蒙脱土,00.8～0.9时,黏土颗粒表面持续吸附弱结合水,此时大孔内逐渐充填水分。离子固化剂通过改变蒙脱土的微观物理化学性质（阳离子与晶层基面）调控其吸附水特性,进而影响不同尺度孔隙的吸附水过程。     

流态化法部分热解氯化镁制备镁水泥原料的研究

探讨了影响流态化法热解水合氯化镁的主要因素,在进口温度750℃下,改变进料速度,可控地制备了不同摩尔比的镁水泥原料。     

湘南地区"蓝山式"氧化铁锰矿床成矿机理探讨

在总结氧化铁锰矿特点的基础上,通过"蓝山式"氧化铁锰矿形成条件(基底构造、沉积盆地、矿源层、自然地理条件和新构造改造等)的分析,探讨了"蓝山式"氧化铁锰矿的成矿机理.     

Moessbauer and XRD characterization of contaminated sediments by coal mining drainage in Neath Canal, South Wales, UK

Sediment cores were collected from the upstream of the Neath Canal in South Wales and characterized for their mineral compositions and iron speciation in order to understand the influence of sedimentary properties on the contaminants of heavy metals. The sediments in the canal have been polluted by ocherous precipitate with heavy metals such as arsenic since a major mine water discharge in spring 1993. The sediment core was obtained just from the discharge point in the canal and distinguished into three layers in the field regarding to their physical properties including visible color, sediment particle composition and dryness. X-ray diffraction （XRD） and M6ssbauer spectroscopy revealed vertical variations of minerals and iron species in depth of the sediment profile. The upper layer, reddish-brown, is wet muddy precipitant and is very fine in particle size, consisting mainly of iron oxide and hydroxide. Arsenic is rich in this layer; probably the sorption on iron oxide surface is the main mechanism. The middle layer, 22.0-27.0 cm, is soft deposit in a yellow color and contains sheet silicate, calcite and goethite. The lower part below 27.0 cm is gray to dark gray in color and contains quartz, pyrite, coal particles that are much more similar to normal aquatic sediment. The upper two layers in brown and yellow colors as newly precipitated mud from AMD contain high concentrations of As, Ni under oxic conditions. The lower part as the old canal sediments under reducing conditions contains high Cu and Zn. Chromium is enriched in the limited part of the low layer, just beneath the boundary between the middle and low parts of the sedimentary column, where the redox conditions shifted from oxic to anoxic. It is clear that the distribution of these heavy metals is closely associated with the redox condition reflected in the iron speciation. Thus different treatments are necessary for each layer of the sediment since different mineral and geochemical properties of the sediment will give different impacts on the heavy metals.