Analytical laboratory comparison of major and minor constituents in an active crater lake

The crater lake water from Maly Semiachik volcano in Kamchatka was used for the international analytical laboratory comparison of major and minor elements, and hydrogen, sulfur, and oxygen isotope data. Eight institutions participated in this program, giving analytical results of 9 major and 20 minor elements mainly by using ICP-AES for cations and IC for anions. Among the major elements, Na, Mg and Si showed coefficients of variation (CV) of 10% or more, whereas B, Al, Fe, Mn had coefficients less than 7%. The CV% of the minor elements Co, Cu, P, Cr, Pb was much greater (>30%) while the V analyses agreed well (<10%). Ti, Sr, Zn, and F were intermediate (between 10 and 20 CV%). The errors observed for these constituents are inherent to the methods applied: large dilutions and spectrometric interferences. Even the major anions such as Cl (>2000 ppm) and SO₄ (>5000 ppm) gave considerable ranges (5.1 and 8.8 CV%, respectively) as did the obtained pH values (22 CV%). The measured δ¹⁸O of the water samples and δ³⁴S of sulfate are in excellent agreement but the δD values had CV% of 8. Technical recommendations are presented to improve the analytical results for these elements with significant deviations from the mean values.     

渤海湾盆地石炭纪-二叠纪煤中基质镜质体飞行时间二次离子质谱研究

利用飞行时间二次离子质谱仪（简称ＴＯＦ－ＳＩＭＳ）对渤海湾地区Ｃ－Ｐ太原组和山西组煤中基质镜质体进行了对比研究,结果表明,在接收到的正二次离子中都含有一定的烯基和烷基碎片,这些脂族碎片离子的出现说明它们具有富氢及较好的生烃性质。同时,该仪器的实际应用结果表明,它对研究煤及源岩中有机显微组分的化学成分和结构具有独特的优势。     

Characteristics of paleoproterozoic Subduction System in Western Margin of Yangtze Plate

INTRODUCTIONDebate centered on Proterozoic tectonic style and crustalevolution has existed for a long time.The customary viewbelieved that the Proterozoic undeveloped solid plate could notput into effect on the subduction because of the high heat flowin the earth,and the continental crustal growth was dominatedby mafic magm a vertical underplating (Wyborn,1988;Etheridge etal.,1987) .However,many observations recentlyobtained from Proterozoic mobile zones in the world suggeststhat Proter…     

Darcys Law Expressed by Chemical Index

Ｉｎ 18 5 6 ,ＨｅｎｒｙＤａｒｃｙｐｕｂｌｉｓｈｅｄｈｉｓｌａｗ ,ｔｈｅＤａｒｃｙ’ｓｌａｗ ,ｅｘｐｒｅｓｓｅｄｂｙｈｙｄｒａｕｌｉｃｉｎｄｅｘｔｈｒｏｕｇｈａｌｏｎｇ ｔｅｒｍｅｘｐｅｒｉｍｅｎｔｏｆｗａｔｅｒｐｅｒｍｅａｔｉｏｎｉｎｍｕｌｔｉ ｍｉｎｅｒａｌｍｅｄｉｕｍ (Ｘｕ ,1986 ) ,ｗｈｉｃｈｎｏｔｏｎｌｙｍｅｔｔｈｅｕｒｇｅｎｔｎｅｅｄｏｆｔｈｅｄｅｖｅｌｏｐｍｅｎｔｏｆｓｏｃｉａｌｅｃｏｎｏ ｍｙａｎｄｐｒａｃｔｉｃｅｆｏｒｃａｌｃｕｌａｔｉｏｎｏｆｗｅｌｌｗａｔｅｒｑｕａｎｔｉｔｙａｔｔ…     

锂同位素及其地质应用研究进展

锂同位素示踪是近几年发展起来的一门新兴的稳定同位素地球化学方法,锂有两个稳定同位素：^6Li和^7Li。自在界锂同位素的组成变化很大,其δ^6Li值变化幅度超过60‰,现代大洋水的δ^6Li值为－31．0‰,洋中脊玄武岩（BORB）的δ^6Li值为－4．7‰--3.7‰,由于锂同位素存在大的分馏和不同地质体中在截然不同的δ^6Li值,因此锂同位素地质应用前景十分广泛。目前,锂同位素在研究星云形成过程和宇宙事件,洋壳蚀变和海底热液活动,壳－幔物质循环和板块俯冲作用过程,判断卤水起源和演化等方面的研究中成效显著。     

EARLY PALEOZOIC SUBDUCTION-RELATED ACCRETIONARY COMPLEX IN WESTERN KUNLUN

EARLY PALEOZOIC SUBDUCTION-RELATED ACCRETIONARY COMPLEX IN WESTERN KUNLUN     

太阳能电池与阀控式蓄电池优化配置分析

野外地震台应用固定式太阳电池组件系统,其太阳能电池组件和蓄电池组件的配置与太阳辐射量,平均发电量,年充电量密切相关,本研究了太阳辐射量,损失量,年充电量,组件串,并联功率计算公式,讨论了太阳能电池及阀控式铅酸蓄电池特点和实际应用情况。     

Study on the isotherms of the interaction between suspended particles and Cu (II) in the Huanghe River

The isotherms of the interaction between the suspended particles and Cu²⁺, and the effects of lysine and asparaginic acid on the isotherms in the Huanghe (Yellow) River were studied by applying the theory and method of interfacial stepwise ion/coordination particle exchange. We obtained a new stepped river isotherm, formed by two curves joined together with a “plateau” in the middle. The adsorption equilibrium constantsK ₁ andK ₂ were calculated by using the isothermal equation of surface stepwise ion exchange. Amino acid in small amount promotes exchange adsorption of the suspended particles with Cu²⁺. The degree of promotive action relates to the isoelectric point of amino acid. The promotive effect of lysine is bigger than that of asparaginic acid. Project 29361001 supported by NSFC.     

Fresh snow chemistry from high mountain regions in central himalayas

Investigations of atmospheric composition in the Himalayas has been limited in both temporal and spatial scales, mainly due to difficult logistics. Ideal sites for monitoring atmospheric composition and its evolution should be free from local pollution and representative of the remote troposphere (HUEBERT et al., 1980). As the Himalayas are far removed from highly industrialized regions they provide suitable locations to monitor the chemistry of the remote troposphere and to study the evolu…     

EFFECTS OF COMPOSITION AND STRUCTURE OF ALGINATES ON ADSORPTION OF DIVALENT METALS

Results of a series of experiments(on the adsorption of divalent metal ions by dried alginic acid, Na and Ca alginates of different composition and block structure) conducted in this systematic study of the effects of the composition and structure of alginates on the static adsorption equilibrium of divalent metal ions indicate that the properties of alginate adsorption to divalent metal ions are highly different, depending not only on the cations used, but also on the form and structure of the alginates. There is close correlation between the adsorption properties and the structure of the alginates. The selectivity coefficient of Na alginate for Cd-Sr ion exchange tends to increase with the increase of the M/G ratio in alginate, whereas the adsorption capacity of Ca alginate for Cu~(2+) ion decrease with the increase of the G-block or the average length of the G-block ((?)_G) and the total adsorption capacity of alginic acid is found to vary in the same order as the F_(MM)(diad frequency) in alginate in