酸碱滴定法测定天然石膏中的碳酸盐(无水碳酸)   总被引：3，自引：0，他引：3  

蔡玉曼  陆丽君  周泳德  高孝礼 《江苏地质》2007,31(2):127-129

建立了用溴百里酚蓝—酚红作指示剂,酸碱滴定法测定天然石膏中碳酸盐的方法。在确定了试验条件的基础上,对石膏国家一级标准物质GBW03109a和GBE03110分析,相对标准偏差分别为0.08%、1.05%;分析3个天然石膏样品,相对标准偏差分别为1.47%、1.67%和0.25%;对试样进行加标回收,回收率在95.53%～97.02%之间;方法检出限为0.15%。表明用该方法测试,结果准确可靠。  相似文献   

盐井二次定向对接连通施工工艺     

沙亚南  谢卫炜 《中国煤田地质》2007,19(A01):48-49,58

新汶矿业集团泰山盐化工ZJ03-PJ03井组为一对定向连通采卤井井组，采用二次定向钻井连通施工工艺，技术套管下入深度907．6m（8矿层顶板），有效地阻隔了上部含较多杂质的岩盐矿层，确保了卤水质量能满足盐化工的需要。本对接连通井组，采用随钻测量井斜、方位及钻进轨迹控制技术，为该井组的顺利对接提供了技术保障。  相似文献   

Flotation Separation of Trace Elements from Alkaline-Earth Matrices by Co(III) Hexamethylenedithiocarbamate before ICP-AES Determination     

Vesna Zajkova Paneva  Katarina Cundeva  Trajce Stafilov 《Geostandards and Geoanalytical Research》2007,31(1):51-60

A method for the selective separation of Ag, Cd, Cr, Cu, Ni, Pb and Zn in traces from solutions of calcite (CaCO₃), dolomite (CaMg(CO₃)₂) and gypsum (CaSO₄.2H₂O) before their determination by inductively coupled plasma-atomic emission spectrometry (ICP-AES) is presented. The expected interferences of Ca and Mg on intensities of trace analytes were removed by collecting the elements of interest with cobalt(III) hexamethylenedithiocar-bamate, Co(HMDTC)₃. The flotation of aqueous solutions (1 l) of calcite, dolomite and gypsum was performed at pH 6.0, by 1.5 mg l⁻¹ Co and 0.6 mmol l⁻¹ HMDTC⁻. To minimise the effect of the reaction between Ca/Mg, which restrains the function of the surfactant, careful selection of the most suitable foaming reagent was necessary. The accuracy of the method was established by analysing natural alkaline-earth minerals by the standard addition method as well as using the dolomite reference materials GBW 07114 and GSJ JDo-1. The ICP-AES limits of detection following flotation on different minerals were found to be 0.080 μg g⁻¹ for Cd, 0.105 μg g⁻¹ for Ag, 0.142 μg g⁻¹ for Cu, 0.195 μg g⁻¹ for Cr, 0.212 μg g⁻¹ for Ni, 0.235 μg g⁻¹ for Zn and 0.450 μg g⁻¹ for Pb.  相似文献   

Investigations of the effects of manganese addition to Dry Creek Saltfield brines     

Peri S.J. Coleman 《International Journal of Salt Lake Research》1998,7(1):25-40

Trials conducted at Dry Creek, a solar saltfield north of Adelaide, Australia, indicate that manganese, as manganous sulphate, can increase both the purity and strength of salt crystals grown at an ambient or neutral-slightly acid pH range resulting in a salt suitable for high purity uses. The improved load bearing strength of the crystals indicates that manganous sulphate could also be useful in salt floor maintenance. However, the impact of an apparently slight rise in pH to 8.5 was significant. Crystals produced at the higher pH from the manganese enriched brine were opaque with many tiny, almost colloidal crystals. The salt did not drain well, had low load bearing strength and was notably impure.  相似文献   

硫酸盐渍土在多次冻融循环时的盐胀累加规律   总被引：10，自引：3，他引：7  

褚彩平 《冰川冻土》1998,20(2):108-111

通过室内模拟试验,研究了硫酸盐渍土在历经多次冻融循环时的盐胀累加规律,得出了盐胀累加的不同类型,给出了累加盐胀率与循环次烽之间的关系式,进一步揭示了盐胀累加的 和影响因素。  相似文献   

多途径解决我国钾盐资源紧缺的对策探讨   总被引：6，自引：0，他引：6  

宋新宇  郎一环 《地质与勘探》1998,34(6):10-13

探讨了钾盐矿产的应用,钾盐矿产在世界及我国的分布状况,提出了解决我国钾盐矿产资源紧缺问题的途径。  相似文献   

察尔汗盐湖盐田渗漏及其工程地质条件分析     

王石军 《化工矿产地质》1998,20(4):301-307

１９８１年以来对察尔汗盐湖三次渗漏试验结果表明,盐田渗漏是盐田土层与外界条件综合作用的结果,在盐田建设和生产管理过程中,应结合不同地点的土层特性、工程地质条件和其它有关条件,采取不同的处理措施。  相似文献   

Pleistocene climatic change in Southern Australia and its effect on speleothem deposition in some Nullarbor caves     

Albert Coede  Russell S. Harmon  Tim C. Atkinson  Peter J. Rowe 《第四纪科学杂志》1990,5(1):29-38

Activity ratios of ²³⁴U/²³⁸U, ²³⁰Th/²³⁴U, and ²³⁰Th/²³²Th have been determined for calcite, gypsum and halite speleothems from caves of the Nullarbor Plain, mostly in the area N and NW of Mundrabilla Station, for the purpose of U-series dating. All calcite speleothems contain adequate amounts of uranium for dating, but some show an excess of ²³⁰Th. Stratigraphic relationships indicate that there were at least three phases of calcium carbonate deposition in the Nullarbor caves. The calcite samples, with one possible exception, have ages in excess of ca. 400000 yrs BP. This suggests that no significant amounts of calcium carbonate deposition have taken place during the last 400ka. At present, active deposition of speleothems is restricted almost entirely to gypsum and halite. The only gypsum speleothem dated was found to have a finite age of ca. 185 ka. Six dates on a small halite speleothem containing insect and arachnid remains indicate that it formed rapidly during Holocene time.  相似文献   

Spatial and temporal variations in aboveground and belowground biomass of Spartina maritima (small cordgrass) in created and natural marshes     

Jesús M. Castillo  Pablo Leira-Doce  Alfredo E. Rubio-Casal  Enrique Figueroa 《Estuarine, Coastal and Shelf Science》2008,78(4):819-826

Spartina species are commonly used for salt marsh manipulative projects, where aboveground and belowground biomasses are functional traits that play important roles, showing high spatial and temporal variations. This work analyses variations in AGB and BGB of Spartina maritima and abiotic environmental parameters along a chronosequence of six marshes created from 1997 to 2003 with disparate sediment dynamics, and adjacent natural marshes and unvegetated tidal flats. S. maritima behaved as an autogenic engineer, as its colonization of bare sediments yielded abiotic environmental changes: specifically, bed level rise accompanied by higher oxygenation and salinity. These modifications of the environment were site-specific, depending mainly on sedimentary dynamics. At the same time, abiotic environmental changes determined biomass production rates of S. maritima that were higher in more-accreting marshes; however, AGB was kept constant from early in its development (2 years). The increase in BGB with elevation seemed to be related to the inhibition of subsurface tissue development in anoxic sediments. Biomass accumulation and production varied markedly, depending on the spatial scale, indicating the relevance of the plot size chosen for the analysis of biomass of cordgrasses. Our results show that managers of salt marshes should consider sedimentary dynamics carefully when setting realistic expectations for success criteria of created and restored wetlands.  相似文献   

Wind impact on pollutant transport in a shallow estuary   总被引：4，自引：0，他引：4  

XU Hongzhou  LIN Jing  SHEN Jian  WANG Dongxiao 《海洋学报(英文版)》2008,27(3):147-160

A three-dimensional numerical model, EFDC （ environmental fluid dynamics code） is applied to the Pamlico River Estuary （PRE） in eastern North Carolina of the United States to examine the wind impact on pollutant age distributions and residence time. A series of model experiments representing base case, remote-wind-induced water level set-up and local winds cases are conducted. Model results indicate that the pollutant mean age and the system residence time are functions of gravitational circulation in the PRE. The system responses to remote-wind-induced water level set-up are different in different portions of the PRE. Under such condition, dissolved substances in the upstream portion of the PRE have a younger age and shorter residence time （compared with the base case） , by contrast, they have a older age and longer residence time in the downstream portion of the PRE. Upriver and downriver local winds appear to have opposite impacts on pollutant age distributions. The substances are retained much longer within the PRE under upriver wind than those under downriver wind. The model results also suggest that across - river winds may lead to longer residence time through enhanced turbulence mixing, which slows down the gravitational circulation in the PRE.  相似文献