共查询到17条相似文献，搜索用时 93 毫秒
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本文介绍了碘酸钾标准物质的研制程序，其中包括溶液的配制、均匀性和稳定性检验、分析方法和数据统计处理方法等。并选择了具有高准确度的精密库仑法和自动电位滴定法分析定值，对制备浓度为０．０１ｍｏｌ／ｄｍ３碘酸钾标准物质，其定值的相对不确定度可达０．１％，稳定期在一年以上 相似文献
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本文介绍了海水中砷标准物质的研制过程，其中包括溶液的配制、均匀性和稳定性检验，标样的分析方法。并对标准物质的定值数据进行统计处理，两种浓度的定值结果分别为：１．００μｇ／ｃｍ３±０．０４μｇ／ｃｍ３和５１．０μｇ／ｄｍ３±２．６μｇ／ｄｍ３。两种浓度砷标准物质的稳定期均为一年 相似文献
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本文介绍了海水中硒标准物质的研制过程，其中包括溶液的配制、均匀性和稳定性检验以及标样的分析方法。并对标准物质的定值数据进行统计处理，海水中硒两种浓度的定值结果分别为１．００±０．０５μｇ／ｃｍ３和２０．０±１．２μｇ／ｄｍ３。稳定期均为一年。 相似文献
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本文介绍了供测定水和海水中活性磷酸盐含量的标准物质的研究程序。其中包括了标准物质的配制、均匀性和稳定性检验、分析方法和数据统计处理等。并采用离子色谱法和分光光度法进行定值，对制备浓度分别为０．４０、０．８０、１．６０、３．２０、４．８０μｍｏｌ／ｄｍ３的磷酸盐标准物质，其相对不稳定度分别为３％、２％、１％、１％、１％。稳定期为一年以上。 相似文献
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报道了我国与俄罗斯合作研制的三个海山富钴结壳标准物质GSMC-1,2,3.这三个标准物质的原样分别取自西太平洋麦哲伦海山和中太平洋海山.样品经风干、选配、球磨制备成均匀的粉体样品,其均匀性采用高精度的X-射线荧光光谱法检验.样品的化学组分采用国内外多实验室协同分析方式定值,有八个国内实验室和八个国外实验室参加了合作分析.测试组分均为57个,其中GSMC-1,2有43个组分定为保证值,10个组分作为参考值;GSMC-3有45个组分定为保证值,8个组分作为参考值.经2a多的试用,三个标准物质已于2005年被国家计量部门批准为国家一级标准物质,其编号分别为GBW07337,GBW07338和GBW07339. 相似文献
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轻元素稳定同位素的标准评述 总被引：2，自引：0，他引：2
标准物质在稳定同位素分析的质量保证体系以及分析数据的可比性方面起着关键性作用，因此标准物质的研制具有重要意义。本文评述了国际上在轻元素（氢、碳、氮、氧和硫）稳定同位素标准物质研制方面的最新进展。 相似文献
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本研究以西太平洋表层海水为基质,制备了浓度为0.5～4.0μmol/L的海水活性磷酸盐系列标准物质。通过对所研制的4批次样品进行均匀性、稳定性评估,确定样品性能良好。对基于磷钼蓝分光光度法的气泡间隔连续流动分析系统的反应和操作条件进行优化,优化后的方法检出限低至0.03μmol/L。不同浓度样品的相对标准偏差为0.37%～2.45%(n=9);通过与国际已有有证标准物质比对,本研究方法测量误差小于0.05μmol/L。经6家具有中国计量认证资质且具备海水磷酸盐检测能力的实验室联合定值,确定了该系列标准物质的标准值,并对定值结果的不确定度进行了分析评价,相对扩展不确定度为2%～10%。 相似文献
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In this article, sampling locations, sample types, sample processing methods, and certified values of ocean manganese nodule and sediment reference materials available throughout the world are briefly described. Recommended or information values of major, minor, and trace constituents in those samples have also been collected, and a review of the main characteristics of their property values is presented. 相似文献
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V. Balaram 《Marine Georesources & Geotechnology》1999,17(1):17-26
A polymetallic nodule reference sample (No. 2388)collected from the Indian Ocean, and seven other samples, two from the United States Geological Survey, USA (Nod-A-1 and Nod-P-1), three from Russia (OOPE 601, OOPE 602, and OOPE 603), and two from China (GSPN-2 and GSPN-3), collected from different loca tions, are available for calibration purposes and as control samples in the analytical programs for polymetallic nodules and associated sediments to ensure accurate measurements. They are not certified for precious metal concentrations, however, and the data available are very scanty. An attempt has been made to provide working values for platinum, palladium, gold, and silver and indicative values for osmium, iridium, and ruthenium in these eight ferromanganese nodule reference samples, using inductively coupled plasma mass spectrometry (ICP-MS). To assess the accuracy of the method, certified reference materials, WPR-1, WMS-1, WMG-1, and WGB-1 Canadian Certified Materials Project (CCRMP, Canada) were analyzed, and the data obtained were compared with the certified values. The estimate of analytical reproducibility was found to be better than 15 % RSD for most elements with comparable accuracy. The data presented for this set of manganese nodule reference samples may be useful in geochemical studies of manganese nodules and associated sediments. 相似文献
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从样品制备、仪器操作参数最佳化、内标补偿等几方面着手,利用两个标准物质(GSPN-2,GSPN-3)发展了大洋多金属结核中27种元素的等离子体质谱(ICP-MS)测定方法.这27种元素包括Ba,Ce,Co,Cu,Dy,Er,Eu,Gd,Ho,La,Li,Lu,Mo,Nd,Pr,Sb,Sc,Sm,Tb,Th,Tm,U,V,W,Y,Yb和Zn.各元素测定值与保证值相当吻合.对GSPN-2和GSPN-3,Ba,Sb,Sc,Y,Zn等5种元素可用外标校准法准确测定,其平均回收率(n=3)在91.4%～106.9%之间;可用内标(103Rh)校准法准确测定其他22种元素,其平均回收率(n=3)在89.4%～110.2%之间;各元素3次测定的相对标准偏差(RSD)为0.0%～11.0%. 相似文献
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本文采用聚四氟乙烯高压罐消化海洋沉积物。这种密闭的消化体系避免了硅的挥发损失和玷污,能达到对高含量硅沉积物的完全消化,并且消除了氢氟酸的干扰;采用分光光度法测定总硅,简化了操作步骤,加快了测定速度。本法的精密度为0.8％,回收率为99—lOl％,测定水系沉积物标准样品的结果与推荐值的相对偏差小于O.5％。本法已应用于台湾海峡沉积物总硅的测定,获得满意的结果。 相似文献
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A rapid single extraction procedure using dithiocarbamate complexing agent, a di-isobutyl ketone (DIBK) organic phase and Hg exchange back-extraction is described for the simultaneous quantitative preconcentration of Cd, Co, Cu, Fe, Ni, Pb and Zn in seawater. An 8-hydroxyquinoline (oxine) extraction technique is also presented for the subsequent determination of Mn using the same reagents and operating system. The proposed method gave quantitative spike recoveries for all metals and was in excellent agreement with the certified results for CASS-3 marine reference seawater. Blanks and detection limits are in the low ppt range. The method gives a preconcentration factor of 72 for an 80-ml sample, facilitating the analysis of pristine seawater samples. 相似文献
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G. Yu. Pavlova P. Ya. Tishchenko T. I. Volkova A. Dickson K. Wallmann 《Oceanology》2008,48(3):438-443
In 2000, the Carbon Dioxide in the Ocean working group of the North Pacific Marine Science Organization (PICES) performed an international experiment on the intercalibration of the measurements of the total alkalinity in seawater using certified reference materials (CRM). Taking part in this experiment, Russian specialists presented the method by Bruevich. The results of the intercalibration showed that the alkalinity values obtained by Bruevich’s method using modern burettes, an Na2CO3 reactant of high purity as a standard to ascertain the acid titre, and corrections for the acid density and for the weights of the acid and seawater samples in vacuum are in agreement with the standard within ±1 μ M/kg. 相似文献