原子吸收法测定降水中的钾、钠、钙、镁的改进

对标准分析方法中的K、Na、Ca、Mg分开测定改进为混合测定。改进法与标准法的校准曲线、精密度与准确度均较为一致。改进法简化了操作程序，提高了工作效率。     

钙基脱硫灰在酸性条件下的稳定性研究

常温下钙基脱硫灰的稳定性主要受外界pH值的影响，其次还与所处的气氛有关。文中对空气和氮气两种气氛下灰样中亚硫酸钙在酸性条件下分解放出二氧化硫的量进行了测定，研究了常温下钙基脱硫灰的稳定性及其对环境的影响。     

云南保山中晚志留世碳酸盐岩的锶同位素组成及海平面变化

本文以云南保山地区中上志留统栗柴坝组海相碳酸盐岩作为研究载体,运用锶同位素比值方法,结合岩石学、古生物学等,对该区志留系中晚期的海平面变化情况及其影响因素进行了研究。其中锶同位素比值数据为该区首次获得,其所反映的海平面变化趋势与同时期美国中西部的海平面演化曲线具有良好的耦合性。研究结果表明;剖面第一段至第二段,~(87)Sr/~(86)Sr值逐渐减小,表明此时海平面相对逐渐升高;第二段~(87)Sr/~(86)Sr值整体处于相对低的水平,总体呈现出逐渐减小趋势,且在21号样品处达到最低值(0.710 5),说明此阶段海侵作用明显;第三段,在较短的地质时期内,~(87)Sr/~(86)Sr值表现出相对强烈的正偏移,达到极值0.728 49,说明海平面相对下降明显。总之,志留系中晚期海平面表现为先升后降的过程。锶同位素的强烈偏移以及岩石内较高的~(87)Sr/~(86)Sr值,正是同时期造山运动和海平面下降事件的反映。     

Chemical Tracking and Marine Environmental Impact of Ocean Disposal of Calcium Carbonate Residue in the North Yellow Sea

The objective of this study is to determine the sedimentation rate and dispersion area of calcium carbonate residue dumped at sea and the impact to marine environment of dumping by a laboratory simulation experiment; chemical tracking in the field with the help of acoustic and optical tracking; and a comparative study of baseline conditions and marine environmental impact after dumping. Turbidity, pH and phosphate are selected as the chemical tracers to be monitored.

Results show that in the dumping area of 15 square miles with water depth of 50 m, if 217 t calcium carbonate residue is dumped (spot dumping) in the presence of a pycnocline with a current velocity of 60 cm/s (close to the maximum) the maximum dispersion distance of the calcium carbonate residue plume front is less than 2100 m; the dispersion area is less than 0.56 km²; and the maximum dispersion time is about 60 min when the turbidity and pH in the whole dispersion area return to background level. Therefore, the ocean disposal of calcium carbonate residue is feasible.     

生长介质中CaCO3质量分数及水分状况与HCO3-的关系

探讨生长介质中CaCO3质量分数(g/kg)与HCO3^-质量摩尔浓度(mmol／kg)之间的定量关系，以及HCO3^-产生过程中水分条件所起的作用。培养试验结果表明，生长介质中CaCO3质量分数一旦达到较高水平，将对作物生长产生明显的不利影响。介质中CaCO3质量分数与HCO3^-质量摩尔浓度之间未表现出显著的正相关关系；但HCO3^-质量摩尔浓度随着水分含量增加而显著增加，尤其是过饱和的水分条件能使HCO3。质量摩尔浓度大幅度增加。随CaCO3含量增加，培养介质的pH值并未产生明显变化，水分状况对介质pH值的影响也不显著。供试条件下CaCO3在介质中的淋溶量随着供水量的增加而增加。     

联碱废水资源化治理工艺的研究

提出预处理→二级蒸馏→吹脱治理联碱废水的新工艺 ,不仅使废水中的氨氮达到排放标准 ,而且能回收氨氮 ,具有一定的经济效益和社会效益。     

西湖水体中铁铝钙镁的环境行为探讨

研究西湖水中铁，铝，钙，镁的含量分布，水平方向的动态交换，以及在引物水期与非引水期的变化，探讨这些元素在西湖水体自净中的作用。     

贵州连续性碳酸盐岩上覆景观特征的定量研究

利用GIS软件,探讨了贵州以连续性碳酸盐岩为基底地区的上覆景观单元、破碎化及斑块分形的特征及其形成原因。研究区域中,受岩性控制景现在整体上体现出一致性的基础上,又存在着明显的内部差异性。一致性表现为以灌木林地为优势景观,森林和草地中以次生景观为主,偏小的斑块占大多数,斑块大小分布全为正偏, 其分布曲线多为尖峭峰,斑块研究不存在面积上尺度域,斑块形状在人为强烈干扰下趋于规则而导致类型分维数的值偏小,人为干扰大的景观中斑块的破碎化更加明显。相比连续性白云岩地区,连续性石灰岩地区的水资源利用率低下,抗干扰能力弱,景观多样性不均衡,退化更严重,分割程度更破碎,空间异质性更强,稳定性差,易向逆向演替的方向发展。     

Feasible conversion of solid waste bauxite tailings into highly crystalline 4A zeolite with valuable application

Bauxite tailings are a major type of solid wastes generated in the flotation process. The waste by-products caused significant environmental impact. To lessen this hazardous effect from poisonous mine tailings, a feasible and cost-effective solution was conceived and implemented. Our approach focused on reutilization of the bauxite tailings by converting it to 4A zeolite for reuse in diverse applications. Three steps were involved in the bauxite conversion: wet-chemistry, alkali fusion, and crystallization to remove impurities and to prepare porous 4A zeolite. It was found that the cubic 4A zeolite was single phase, in high purity, with high crystallinity and well-defined structure. Importantly, the 4A zeolite displayed maximum calcium ion exchange capacity averaged at 296 mg CaCO₃/g, comparable to commercially-available zeolite (310 mg CaCO₃/g) exchange capacity. Base on the optimal synthesis condition, the reaction yield of zeolite 4A from bauxite tailings achieved to about 38.43%, hence, this study will provide a new paradigm for remediation of bauxite tailings, further mitigating the environmental and health care concerns, particularly in the mainland of PR China.     

Utilization of limestone dust waste as filler in natural rubber

The possibility of using limestone dust waste (LDW) as a filler in natural rubber (NR) was investigated. First, the basic properties of LDW were characterized; LDW was then incorporated into NR and the compound properties were determined. Comparison of the reinforcing effect of LDW and other commercial fillers such as light-precipitated calcium carbonate (PCC) and nanoprecipitated calcium carbonate (NPCC) was made. The results revealed that even though the addition of LDW has little effect on compound processability, it has a negative effect on most mechanical properties, e.g., tensile strength, tear strength, and abrasion resistance, of the vulcanizate. Among the three fillers, the degree of reinforcement could be placed in the following order: NPCC > PCC > LDW. Due to their relatively low specific surface area and thus low reinforcement ability, both LDW and PCC can be grouped as nonreinforcing fillers, whereas NPCC, the specific surface area of which is relatively high, could be grouped as a semi-reinforcing filler for rubber.