共查询到20条相似文献，搜索用时 156 毫秒
1.
毛细管离子电泳分离间接紫外光度法测定镍矿石镍钴铜 总被引：1，自引：0，他引：1
研究了以咪唑为背景吸收电解质,α－羟基异丁酸为络合剂,毛细管离子电泳分离,间接紫外光度法测定镍矿石中Ｎｉ,Ｃｏ,Ｃｕ含量。考察了背景电解质的ｐＨ值,α－羟基异丁酸和咪唑浓度对Ｆｅ＾３＋,Ｃｏ＾２＋,Ｎｉ＾２＋,Ｚｎ＾２＋,Ｃｕ＾２＋分离的影响,在优化的条件下,几种离子在８ｍｉｎ内完成分离,检测限低至０．２ｍｇ／Ｌ,以Ｚｎ作内标,改善了方法的精密度,对于２０ｍｇ／Ｌ各离子峰面积的相对标准偏差〈６．５ 相似文献
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重金属离子与石英表面反应的实验研究 总被引：18，自引：3，他引：15
石英对Ｃｕ＾２＋,Ｐｂ６２＋,Ｚｎ＾２＋,Ｃｄ＾２＋,和Ｎｉ６２＋等二价重金属离子的吸附等温线研究表明,石英对重金属离子的吸附反应可用Ｆｒｅｕｄｌｉｃｈ方程很好地进行描述,拟合曲线相关系数〉０．９６,吸附反应以形成金属离子单配位形态为主,只是Ｃｕ＾２＋,Ｚｎ＾２＋和Ｎｉ＾２＋等三种离子有一部分双配位形态生成。同时,利用表面配位理论模式对实验结果进行拟合,其结果为表观表面配位常数ｌｇＫＭ＝２．２－３ 相似文献
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宋小军 《华北地质矿产杂志》1995,(4)
通过４个月实地和近３年的追踪观测，查明拒马矿泉水产于涞源县浮图峪铜矿区的闪长玢岩与夕卡岩接触带中。Ｈ＿２ＳｉＯ＿３含量２５～３９ｍｇ／Ｌ；Ｓｒ含量０．４０～０．３９ｍｇ／Ｌ，还含有ＣＯ＿２，Ｉ，Ｂｒ，Ｌｉ，Ｚｎ，Ｍｏ，Ｓｅ，Ｃｕ等多种对人体有益的微量元素，是极为宝贵的矿泉水资源。 相似文献
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宋小军 《华北地质矿产杂志》1995,10(4):515-519
通过４个月实地和近３年的追踪观测，查明拒马矿泉水产于涞源县浮图峪铜矿区的闪长玢岩与夕卡岩接触带中。Ｈ２ＳｉＯ３含量２５￣３９ｍｇ／Ｌ；Ｓｒ含量０．４０￣０．３９ｍｇ／Ｌ，还含有ＣＯ２，Ｉ，Ｂｒ，Ｌｉ，Ｚｎ，Ｍｏ，Ｓｅ，Ｃｕ等多种对人体有益的微量元素，是极为定贵的矿泉水资源。 相似文献
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酸分解试样，点滴麦勒膜制片，Ｎｉ元素作内标，使用Ｘ射线荧光光谱法同时测定金银标准样品中Ａｕ，Ａｇ，Ｃｕ和Ｚｎ，分析范围为０．２％－１００％。对于Ａｕ，Ａｇ，Ｃｕ和Ｚｎ含量为８３％，８．０％，６．２％，３．０％的试样，其ＲＳＤ（ｎ＝６）分别为０．１％、１．１％、０．９％和１．１％。 相似文献
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N-间甲苯基-N′-(对氨基苯磺酸钠)硫脲与铜的显色反应及应用 总被引：1，自引：0，他引：1
研究了新试剂Ｎ－间甲苯基－Ｎ′－（对氨基苯磺酸钠）硫脲（ＭＭＰＴ）与Ｃｕ２＋的显色反应。结果表明,在ｐＨ４．６～５．６的ＨＡｃ－ＮａＡｃ介质中,Ｃｕ２＋与ＭＭＰＴ形成的配合物至少稳定５ｈ,其λｍａｘ＝３７０ｎｍ,表观摩尔吸光系数为１．１２×１０５Ｌ·ｍｏｌ－１·ｃｍ－１。Ｃｕ２＋的质量浓度在０．０８～１．４ｍｇ／Ｌ时符合比尔定律,相关系数ｒ＝０．９９９１。方法简便、快速,用于铅矿中铜的分析,测定结果与监控样推荐值相符,对ｗ（Ｃｕ）＝０．８％的试样测定６次,ＲＳＤ＝３．２％。 相似文献
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离子交换分离——离子色谱法测定造币镀液及其废液中氯离子及硫酸根 总被引：3，自引：0，他引：3
提出了用７３２型阳离子交换树脂分离造币镀镍液中高含量Ｎｉ,离子色谱法测定Ｃｌ＾－及ＳＯ４＾２－的方法。确定了分离条件。样品经分离后,进入离子色谱仪时Ｎｉ的残留浓度≤０．０１２ｍｇ／Ｌ,去除率≥９９．６％。Ｃｌ＾－的相对标准偏差为０．３２％￣１．４５％,回收率９９．０％￣１００．８％;ＳＯ４＾２－的相对标准偏差为０．４５％￣０．８９％（ｎ＝４）,回收率９８．８％￣１０１．２％。同一分离柱经多次测定造 相似文献
9.
Gomati河近期沉淀物的重金属污染与人类活动的影响 总被引：5，自引：0，他引：5
在对Ｇｏｍａｔｉ河中近期沉淀的表层沉淀物的多种金属进行了浓度测定（Ｇｒ、Ｃｕ、Ｃｏ、Ｆｅ、Ｍｎ、Ｎｉ、Ｐｂ、Ｚｎ和Ｃｄ）,发现一些金属浓度（ｍｇ／ｋｇ）显著增加,其中Ｃｄ：０．２６￣３．６２、Ｃｕ：３３￣１４７、Ｎｒ：４５￣８６、Ｐｂ：２５￣７７和Ｚｎ：９０￣３８９。贯穿勒克瑙市区河流中,金属剖面图显示了沿顺流方向浓度增加,这是由于该区４个主要的排水网络排放废水所致。金属污染程度与地区背景值和全球 相似文献
10.
锌与meso—四（2—磺酸萘基）卟啉显色反应研究 总被引：3，自引：0，他引：3
研究了新合成的显色剂ｍｅｓｏ－四（２－磺酸萘基）卟啉与Ｚｎ＾２＋的显色反应。在ｐＨ９．４０的Ｎａ２Ｂ４Ｏ７－ＮａＯＨ缓冲体系中,以Ｈｇ６２＋及咪唑共同催化,在室温下８ｍｉｎ即反应完全。配合物最大吸收波长为４３４ｎｍ,表观摩尔吸光系数为４．２６×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,Ｚｎ＾２＋浓度在０－０．１４μｇ／ｍｌ范围内符合比尔定律。配合物组成为ＴＮＰＳ４：Ｚｎ＾２＋＝２：１。利用ＭＩＢＫ萃取 相似文献
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S. Viswanathan K. Surya Prakash Rao B. Mahabaleswar 《Journal of the Geological Society of India》2013,82(6):621-627
Komatiites are mantle-derived ultramafic volcanic rocks. Komatiites have been discovered in several States of India, notably in Karnataka. Studies on the distribution of trace-elements in the komatiites of India are very few. This paper proposes a simple, accurate, precise, rapid, and non-destructive wavelength-dispersive x-ray fluorescence (WDXRF) spectrometric technique for determining Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in komatiites, and discusses the accuracy, precision, limits of detection, x-ray spectral-line interferences, inter-element effects, speed, advantages, and limitations of the technique. The accuracy of the technique is excellent (within 3%) for Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Zr, Nb, Ba, Pb, and Th and very good (within 4%) for Y. The precision is also excellent (within 3%) for Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th. The limits of detection are: 1 ppm for Sc and V; 2 ppm for Cr, Co, and Ni; 3 ppm for Cu, Zn, Rb, and Sr; 4 ppm for Y and Zr; 6 ppm for Nb; 10 ppm for Ba; 13 ppm for Pb; and 14 ppm for Th. The time taken for determining Sc, V, Cr, Co, Ni, Cu, Zn, Rb, Sr, Y, Zr, Nb, Ba, Pb, and Th in a batch of 24 samples of komatiites, for a replication of four analyses per sample, by one operator, using a manual WDXRF spectrometer, is only 60 hours. 相似文献
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奥地利安东帕有限公司 《岩矿测试》2009,28(3):306-306
最新的流行病学研究表明,空气中较高浓度的悬浮细颗粒可能对人类的健康有不利的影响。根据该项研究显示,由于心脏病、慢性呼吸问题和肺功能指标恶化而导致死亡率的升高与细尘粒子有关。这些研究结果已经促使欧盟于1999年4月出台了限制空气中二氧化硫、二氧化氮、氧化氮、铅和颗粒物含量的法案(1999/30/EC),对各项指标包括对可吸入PM10颗粒的浓度提出了新的限制性指标。PM10颗粒是指可以通过预分级器分离采集的气体动力学直径小于10μm的细颗粒。目前研究的兴趣重点逐步偏向PM2.5这些更细微颗粒物,PM2.5这种颗粒物对健康有明显的不利影响。在欧盟指令2008/50/EC中,对PM10和PM2.5都提 相似文献
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E. M. Prasolov S. A. Sergeev B. V. Belyatsky E. S. Bogomolov K. A. Gruzdov I. N. Kapitonov R. Sh. Krymsky V. O. Khalenev 《Geochemistry International》2018,56(1):46-64
This paper reports the first results of a study of 11 isotope systems (3He/4He, 40Ar/36Ar, 34S/32S, 65Cu/63Cu, 62Ni/60Ni, 87Sr/86Sr, 143Nd/144Nd, 206–208Pb/204Pb, Hf–Nd, U–Pb, and Re–Os) in the rocks and ores of the Cu–Ni–PGE deposits of the Norilsk ore district. Almost all the results were obtained at the Center of Isotopic Research of the Karpinskii All-Russia Research Institute of Geology. The use of a number of independent genetic isotopic signatures and comprehensive isotopic knowledge provided a methodic basis for the interpretation of approximately 5000 isotopic analyses of various elements. The presence of materials from two sources, crust and mantle, was detected in the composition of the rocks and ores. The contribution of the crustal source is especially significant in the paleofluids (gas–liquid microinclusions) of the ore-forming medium. Crustal solutions were probably a transport medium during ore formation. Air argon is dominant in the ores, which indicates a connection between the paleofluids and the atmosphere. This suggests intense groundwater circulation during the crystallization of ore minerals. The age of the rocks and ores of the Norilsk deposits was determined. The stage of orebody formation is restricted to a narrow age interval of 250 ± 10 Ma. An isotopic criterion was proposed for the ore-bearing potential of mafic intrusions in the Norilsk–Taimyr region. It includes several interrelated isotopic ratios of various elements: He, Ar, S, and others. 相似文献
15.
Mining induced subsidence can significantly affect mining costs where major surface facilities and natural environment need to be protected. Overburden grout injection is a technology used to control coal mine subsidence by injecting the mine waste material extracted from the coal back into the inter-burden rock during longwall mining. The flowing slurry is here categorised as a nonlinear viscous cohesive (Bingham plastic) fluid. During longwall mining the grout slurry is pumped into the separated beds of the rock mass through a central vertical borehole, which is drilled deep into the inter-burden rock strata above the coal seam. However, a blockage can occur in the injection system when the slurry velocity falls below a certain critical threshold velocity, indicating a material phase change from cohesive-viscous to cohesive-frictional. In situ field injection tests through boreholes have been simulated at a smaller scale at the CSIRO laboratory in Brisbane by pumping the slurry through a radial disk (gap = 4 mm) from its centre. Laboratory experiments indicate a general, nonlinear, cohesive, viscous, frictional model for shear behaviour of the slurry, in which the material shear parameters are functions of the disk radial distance. Complete dimensional and dimensionless analytical solutions have been developed based on an approach related to Bingham–Herschel–Bulkley fluid mechanics. The derived formulae include relations for minimum pump pressure, local pressure and pressure gradient, wall shear stress, volume rate, velocity and velocity gradient. The theoretical results match the experimental measurements. The experiments covered slurries with maximum particle sizes of 0.5 to 2 mm with about 50% being larger than 100 µm. The viscosities at the various solids concentrations were measured with a standard torsion viscometer. This study differs from the previous research in several distinct aspects, namely, consideration of the variable shear parameters rather than fixed values, inclusion of total nonlinear behaviour, and implementation of a friction function to mimic behaviour of the deposited and consolidating stiff slurry, which can cause a significant pressure rise as a result of the increased shear resistance. 相似文献
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岩石密度和超高压岩石折返速率 总被引：1，自引：3，他引：1
在常温常压条件下对中国大陆科学钻CCSD主孔100-3000米岩心样品进行了密度测量,建立了密度连续剖面,并界定了不同超高压岩石的密度值。通过对比高温高压物性实验资料,岩石密度随着退变程度增强而降低,榴辉岩密度变化序列为3.52g/cm3→3.49g/cm3→3.07g/cm3→2.93g/cm3。超高压长英质岩石密度变化序列为3.00g/cm→2.80g/cm3→2.65g/cm3。上述实验资料是讨论不同折返阶段岩石所受浮力的基础,为研究折返速率大小提供了基本参数。本文通过折返板块运动平衡时,上浮力与粘滞力平衡这一关系式,定量研究了大陆俯冲板块的折返速率,认为密度差产生上浮力从而引起折返,温度对板块折返速率的影响最为显著;密度差大小、折返角度、折返板块大小对折返速率也有直接的影响。定量模拟分析表明,在温度高于850℃时,板块的折返速率可以超过100mm/a;当温度降至700℃时,折返速率则低于1.5mm/a。作者认为在折返早期,温度较高,板块快速折返至60-70km榴辉岩相深度;随着传导散热,温度降低,板块以较慢的速率折返至中下地壳。折返速率的估算表明,浮力是板块折返第一阶段(从>100km深部折返至<40km的中下地壳)的主要驱动力。 相似文献
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Alexander E. C. Broberg J. S. Kehren A. R. Graziani M. M. Turri W. L. 《Environmental Geology》1993,22(4):353-361
Bellechester, Minnesota, is a small community of approximately 155 residents located on the county line between Goodhue and Wabasha counties in southeast Minnesota's karst region. Bellechester is served by a 21-year-old wastewater treatment facility (WWTF) consisting of three waste-stabilization ponds. On 28 April 1992 six sinkholes were discovered to have drained cell 2 of the WWTF resulting in the loss of approximately 8.7×106 1 of partially treated effluent and about 600 m3 of soil into previously undetected subsurface voids of unknown dimensions. In the week following the collapse, approximately 200 water wells located within a 5-km radius of the WWTF were sampled in an after-the-fact, emergency sampling program. Twelve samples with elevated fecal coliform levels, 18 samples with nitrate-nitrogen greater than the 10 mg/1 standard, and no samples with elevated chlorides were found. However, the elevated levels could not be unambiguously attributed to the WWTF collapse. This is the third WWTF to fail by sinkhole collapse in southeast Minnesota since 1974. All three collapsed lagoons have been located in similar geomorphic and stratigraphic settings. However, at least two lagoons have collapsed in the adjacent area in northeast Iowa, and these lagoons are located at different stratigraphic positions. Twenty-two WWTFs constructed in southeast Minnesota's karst region in the last 25 years have been identified as subject to potential sinkhole collapse. An unknown but significant number of manure storage lagoons, flood control structures, etc., have also been constructed in the karst region and are at risk. Public agencies are beginning to develop plans to deal with the risk associated with existing and future waste lagoons in this environment. The critical hydrogeologic parameters that can be used to prioritize the risk of collapse at existing facilities include: (1) the lithology of the first bedrock beneath each lagoon, (2) the thickness of surficial materials between the lagoon and the bedrock surface, (3) the presence and construction of liners (seepage rate), and (4) the proximity to existing sinkholes. 相似文献
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Mercury,arsenic, antimony,and selenium contents of sediment from the Kuskokwim River,Bethel, Alaska,USA 总被引：1，自引：0，他引：1
The Kuskokwim River at Bethel, Alaska, drains a major mercury-antimony metallogenic province in its upper reaches and tributaries. Bethel (population 4000) is situated on the Kuskokwim floodplain and also draws its water supply from wells located in river-deposited sediment. A boring through overbank and floodplain sediment has provided material to establish a baseline datum for sediment-hosted heavy metals. Mercury (total), arsenic, antimony, and selenium contents were determined; aluminum was also determined and used as normalizing factor. The contents of the heavy metals were relatively constant with depth and do not reflect any potential enrichment from upstream contaminant sources. 相似文献
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滇东南锡、银、铅、锌多金属矿床主要分布在个旧、白牛厂、都龙3个矿区,而滇东南较大的3个花岗岩体又分别出露在3个矿区或附近.花岗岩体均形成于燕山晚期,岩石化学、矿物成分相似,富含锡、银、铅、锌、钨、铜等成矿元素.矿床主金属元素组合与岩体之间的距离由远而近出现由锡、钨、(铍、铌、钽)→锡、钨、(铁)、铜、铟→锡、铅、锌、银、铟、(锑)有规律的变化.花岗岩浆是成矿物质来源和成矿热源.岩浆侵入初期使上覆地层隆起产生背斜(凹陷部位成向斜);同时使地层产生一系列裂隙、压性断层或层间断裂;岩浆侵入晚期,这些断层再次活动,表现为张性,岩浆产生的含矿热液沿由其活动所造成的断裂迁移、充填、交代、沉淀而形成矿床. 相似文献