Showing papers in "Geostandards and Geoanalytical Research in 1995"
TL;DR: In this paper, the results of a study to develop natural zircon geochemical standards for calibrating the U-(Th)-Pb geochronometer and Hf isotopic analyses are reported.
Abstract: We report here the results of a study to develop natural zircon geochemical standards for calibrating the U-(Th)-Pb geochronometer and Hf isotopic analyses. Additional data were also collected for the major, minor and trace element contents of the three selected sample sets. A total of five large zircon grains (masses between 0.5 and 238 g) were selected for this study, representing three different suites of zircons with ages of 1065 Ma, 2.5 Ma and 0.9 Ma. Geochemical laboratories can obtain these materials by contacting Geostandards Newsletter.
4,845 citations
TL;DR: In this article, analytical data for minor and trace elements published or communicated to us, on seventeen GSJ (Geological Survey of Japan) reference samples, up to April 1994 are compiled.
Abstract: Analytical data for minor and trace elements published or communicated to us, on seventeen GSJ (Geological Survey of Japan) reference samples, “Igneous rock series” received up to April 1994 are compiled. The data were evaluated statistically in consideration of analytical methods. Based on the selected available data, 1994 recommended and proposed values for 65 minor and trace elements are presented.
410 citations
TL;DR: In this paper, the working values for the twenty-six CRPG, ANRT and IWG-GIT geostandards are presented, with 95% confidence limits.
Abstract: Working values for the twenty-six CRPG, ANRT and IWG-GIT geostandards are presented, with 95% confidence limits. In addition, the hundreds of geoanalysts who have contributed data on these reference samples are presented, with their country of origin.
130 citations
49 citations
TL;DR: In this article, two new geochemical reference samples, Syenite JSy-1 and Manganese nodule JMn-1 have been prepared by the Geological Survey of Japan (GSJ) for collaborative studies on their chemical composition.
Abstract: Two new geochemical reference samples, Syenite JSy-1 and Manganese nodule JMn-1 have been prepared by the Geological Survey of Japan (GSJ) for collaborative studies on their chemical composition. Major and minor elements are presented. The homogeneity tests show that all elements studied are considered to be distributed homogeneously. A description of their geological and mineral composition is also presented.
41 citations
TL;DR: The microwave oven acid digestion technique has been routinely applied to the ICP-MS multielement analysis of whole powdered coal as discussed by the authors, which results in quantitative and reproducible recovery of more than 40 trace elements with minimum digestion time, minimum use of reagents and minimal operator attendance.
Abstract: The microwave oven acid digestion technique has been routinely applied to the ICP-MS multielement analysis of whole powdered coal. Samples were treated with a mixture of HF/aqua regia/HClO4 in closed Teflon PFA vessels without any pre-treatment. Complete dissolution of the coal matrix is not required, but only one that results in quantitative and reproducible recovery of more than 40 trace elements with minimum digestion time, minimum use of reagents and minimal operator attendance. The precision of the analysis as well as the repeatability of the sample preparation procedure and precision of instrumental measurements have been evaluated. Eight coal standards, including NBS SRM 1632b, 3 South Africa Reference Materials (SARMs) 18 to 20 and 4 USA ARs 1800 to 1803 were analysed in this manner providing data for all the 14 rare earth elements along with others of geochemical interest, technological relevance as well as environmental and health concern. The results, from the ppb level to several ppm, are discussed for all the elements including detection and quantification limits, precision and accuracy. In general, good agreement was achieved with the certified and/or available published values.
29 citations
TL;DR: In this article, the authors used inductively coupled plasma mass spectrometry (ICP-MS) for trace element determination in four reference materials of geochemical interest: USGS Basalt BHVO-1, Rhyolite Obsidian NIST 278, Basalt NIST688, and Phosphate Rock NIST694.
Abstract: Results are presented for 26 to 30 trace elements determined in four rock reference materials of geochemical interest: USGS Basalt BHVO-1, Rhyolite Obsidian NIST 278, Basalt NIST688, and Phosphate Rock NIST694. Determinations were made by inductively coupled plasma mass spectrometry (ICP-MS). Good agreement was obtained among solution standard comparison and standard addition analytical techniques, and among samples prepared with different dissolution methods. Generally good agreement was obtained between determined trace element values and values reported in the literature.
16 citations
TL;DR: In this paper, the authors describe the location, collection, preparation, mineralogy, homogeneity testing, and interlaboratory certification program of a diorite gneiss reference material, SY-4.
Abstract: This report describes the location, collection, preparation, mineralogy, homogeneity testing, and interlaboratory certification program of a diorite gneiss reference material, SY-4. This work was an undertaking of the Canadian Certified Reference Materials Project (CCRMP). SY-4 has been certified for 49 whole-rock, minor, and trace elements. Eight additional constituents have been provisionally certified and information ranges are reported for another 14 elements.
14 citations
TL;DR: In this article, six new Chinese PGE geochemical standard reference samples were analyzed by neutron activation analysis after nickel sulphide fire assay preconcentration, along with a brief description of the analytical procedure.
Abstract: Six new Chinese PGE geochemical standard reference samples, GPt-1 to GPt-6, were analyzed by neutron activation analysis after nickel sulphide fire assay preconcentration. Analytical data on all platinum group elements are presented along with a brief description of the analytical procedure.
13 citations
TL;DR: In this article, eleven gold geochemical reference samples, GAu 8−18, have been prepared by the Institute of Geophysical and Geochemical Exploration, People's Republic of China, and the concentration range of gold in these samples is from 0.5 ng/g to 10 μg/g.
Abstract: Eleven gold geochemical reference samples, GAu 8–18, have been prepared by the Institute of Geophysical and Geochemical Exploration, People's Republic of China. The concentration range of gold in these samples is from 0.5 ng/g to 10 μg/g. Fifteen Chinese Institutes, experienced in gold analysis of geological samples, have participated in the certification procedure using seven reliable analytical methods.
13 citations
TL;DR: In this article, an ion exchange flow injection method is presented for the simultaneous determination of bromide and iodide based on the catalytic reaction during the oxidation of Pyrocatechol Violet by hydrogen peroxide in strongly acid solution.
Abstract: An ion exchange flow injection method is presented for the simultaneous determination of bromide and iodide based on the catalytic reaction during the oxidation of Pyrocatechol Violet by hydrogen peroxide in strongly acid solution. Bromide and iodide in sample solutions are concentrated when they flow through the ion exchange column; they are removed and separated with sodium nitrate eluant flowing through the column, and are monitored spectrophotometrically at 555 nm. All possible anionic interferences were studied. The procedure has been applied successfully to the determination of bromide and iodide in some Chinese standard reference samples. The limits of detection are 0.2 ppm and 0.4 ppm of bromide and iodide respectively in soils and stream sediments.