7
ELSEVIER Spectrochimica Acta Part B 51 (1996) 1435-1441 SPECTROCHIMICA ACTA PART B News on Reference Materials Geochemical reference materials: update 1996 Iwan Roelandts Department of Geology, Petrology and Geochemistry, University of Liege, B-4000 Sart Tilman Liege, 1, Belgium Received 3 June 1996; accepted3 June 1996 Abstract The present column lists additional geochemical reference samples. Included are three tables that provide an easy-to-use survey. The following information is covered: the name of the material, the sample code, the producer, the reference to recent certification,the names and addresses of the suppliers from whom the reference material may be obtained, and specific remarks. Keywords: Geochemical reference materials A high degree of analytical accuracy is required for most geochemical investigations. In this context, the usefulness of natural reference materials (RM) for promoting the development of complex new or improved physicochemical methods of analysis, esti- mating their performance characteristics, evaluating the suitability of methodology, calibrating an instru- ment, assessing bias and accuracy of analytical pro- cedures, providing day-to-day analytical quality control (QC) and quality assurance (QA) measures, assigning values to "secondary (or in-house) RMs", ensuring compatibility between geochemical data from different laboratories (comparability), etc, has been discussed in some detail in the literature [1]. Due to the complexity, the variety and the broad variability in chemical composition of geological materials, it is important for the analyst to have access to a variety of RMs. This means that, ideally, several appropriate RMs of similar type and composition (for both matrix and trace elements) to the samples being analysed should be incorporated with each set. Geo- analysts now generally recognize the need to include RMs with their routinely analysed samples. However, it takes time, but in our opinion it is worthwhile. 0584-8547/96/$15.00 © 1996 Elsevier Science B.V. All rights PII S0584-8547(96)01555-8 Experience has shown that the introduction of well- characterized international RMs as quality assessment materials has resulted in a considerably improved quality of results. Systematic measurement errors can be detected quickly and correction actions can be taken. The explosive growth of instrumental methods for determination of trace elements in geosciences has obviously stimulated the production of an increasing number of RMs (generally by interlaboratory com- parisons employing diverse independent methods of analysis based on different principles). Available standards of interest to geoanalysts have already been cataloged in this Journal [2-7]. The present repertoire is a continuation of our earlier instalments and provides a list of additional samples. As pre- viously, rocks, minerals, ores, soils and related materials have been considered in this work. The main source of information is "Geostandards News- letter", a Journal dedicated to geological reference materials [8]. Three tables have been prepared according to the general style we have adopted in previous instalments in this series. reserved

Geochemical reference materials: Update 1996

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Page 1: Geochemical reference materials: Update 1996

ELS E VI E R Spectrochimica Acta Part B 51 (1996) 1435-1441

SPECTROCHIMICA ACTA PART B

N e w s on Reference Mater ia ls

Geochemical reference materials: update 1996

Iwan Roelandts

Department of Geology, Petrology and Geochemistry, University of Liege, B-4000 Sart Tilman Liege, 1, Belgium

Received 3 June 1996; accepted 3 June 1996

Abstract

The present column lists additional geochemical reference samples. Included are three tables that provide an easy-to-use survey. The following information is covered: the name of the material, the sample code, the producer, the reference to recent certification, the names and addresses of the suppliers from whom the reference material may be obtained, and specific remarks.

Keywords: Geochemical reference materials

A high degree of analytical accuracy is required for most geochemical investigations. In this context, the usefulness of natural reference materials (RM) for promoting the development of complex new or improved physicochemical methods of analysis, esti- mating their performance characteristics, evaluating the suitability of methodology, calibrating an instru- ment, assessing bias and accuracy of analytical pro- cedures, providing day-to-day analytical quality control (QC) and quality assurance (QA) measures, assigning values to "secondary (or in-house) RMs", ensuring compatibility between geochemical data from different laboratories (comparability), etc, has been discussed in some detail in the literature [1].

Due to the complexity, the variety and the broad variability in chemical composition of geological materials, it is important for the analyst to have access to a variety of RMs. This means that, ideally, several appropriate RMs of similar type and composition (for both matrix and trace elements) to the samples being analysed should be incorporated with each set. Geo- analysts now generally recognize the need to include RMs with their routinely analysed samples. However, it takes time, but in our opinion it is worthwhile.

0584-8547/96/$15.00 © 1996 Elsevier Science B.V. All rights PII S0584-8547(96)01555-8

Experience has shown that the introduction of well- characterized international RMs as quality assessment materials has resulted in a considerably improved quality of results. Systematic measurement errors can be detected quickly and correction actions can be taken.

The explosive growth of instrumental methods for determination of trace elements in geosciences has obviously stimulated the production of an increasing number of RMs (generally by interlaboratory com- parisons employing diverse independent methods of analysis based on different principles). Available standards of interest to geoanalysts have already been cataloged in this Journal [2-7]. The present repertoire is a continuation of our earlier instalments and provides a list of additional samples. As pre- viously, rocks, minerals, ores, soils and related materials have been considered in this work. The main source of information is "Geostandards News- letter", a Journal dedicated to geological reference materials [8].

Three tables have been prepared according to the general style we have adopted in previous instalments in this series.

reserved

Page 2: Geochemical reference materials: Update 1996

1436 L Roelandts / Spectrochimica Acta Part B 51 (1996) 1435-1441

Table 1 Additional geochemical reference materials

Sample name Sample code Producer Certification Supplier(s) Remarks

Anorthoclase KAN- 1 KMB R-30 S-26 Microprobe Anorthosite MO- 10 IGEM R- 12 S- 1,4,10

MO-11 IGEM R-12 S-1,4,10 Basalt KB-1 KIER S-14

MO-12 to 15 IGEM R-12 S-1,4,10 UMAT-1 CRMG R-11 S-9

Bauxite SLB-1 IVIC R-16 S-16 Calciphyre GPME301 RIAP R- 1 S-2 Chromitite CHR-Bkg IWG-GIT R-28,10 S-9

CHR-Pt+ IWG-GIT R-28,10 S-9 Clay CRM 461 BCR R-29,13 S-13 F Coal CRM 460 BCR R-29,13 S-13 F, C1 Copper concentrate CCU- lb CCRMP R-2,4 S-5 Copper ore RM 8 6 0 0 HGRL/NIST R-23,35 S-21

RM 8 6 0 1 HGRL/NIST R-23,35 S-21 Copper-Nickel G-3 R-21 Au, PGE Sulfide ore VT-1 R-21 Au, PGE Crystalloschist GPME 401 RIAP R-1 S-2

GPME 402 RIAP R-1 S-2 GPME 403 RIAP R-1 S-2

Diabase NPD- 1 CORM R-31 S-28 TDB-1 CCRMP R-2,4 S-5 Au, PGE

Diorite KD-1 KIER S-14 Diorite gneiss SY-4 CCRMP R-3,4 S-5 Dolerite WS-E IWG-GIT R-8,10 S-9 Feldspar IPT 72 IPT R-14 S-12

ZK UNS R-36 S-29,4 Fly Ash CRM 038 BCR R-29,13 S-13 F, C1 Gabbro JGb-2 GSJ R-33 S-7

KGB-1 KIGMM S-15 MO-7 IGEM R-12 S-1,4,10 MO-8 IGEM R-12 S-1,4,10 MO-9 IGEM R-12 S-1,4,10 WGB-1 CCRMP R-2,4 S-5 Au, PGE WMG-1 CCRMP R-2,4 S-5 Au, PGE

Garnet UWG-2 UW R-37 S-32 1SO Glass 4 glasses R-25 S-24 REE, HFSE Gneiss GPME 201 RIAP R-1 S-2 Gold-bearing sample Au 1 to 4 GGS S-8

CH-3 CCRMP R-2,4 S-5 GAu-8 to -18 IGGE R-40 S-11 GBW(E) 070018 R-19 S-19 to 070023 GTS-2 CCRMP R-4 S-5 Replacement for GTS-1 MA-lb CCRMP R-2,4 S-5 MA-2b CCRMP R-2,4 S-5 MA-3a CCRMP R-4 S-5 Replacement for MA-3 SARM 53 SABS R-20 S-30 SARM 54 SABS R-20 S-30 SARM 56 SABS R-20 S-30 SRM 886 NIST R-23,35 S-21

Granite KG- 1 KIER S- 14 KG-2 KIER S-14

Page 3: Geochemical reference materials: Update 1996

L Roelandts / Spectrochimica Acta Part B 51 (1996) 1435-1441 1437

Table 1 (Continued.)

Sample name Sample code Producer Certification Supplier(s) Remarks

Gypsum FGD-1 DOMTAR R-7 S-6,3 FGD-2 DOMTAR R-7 S-6,3 TIG- 1 DOMTAR R-7 S-6,3

Hornblendite JH- 1 GSJ R-33 S-7 Kaolinite SMP/K1-001 IVIC R- 17 S-33 Komatiite OKUM CORM R-31 S-28 Laterite VL-2 IVIC R-15 S-16 Lead ore RM 8 6 0 2 HGRL/NIST R-23,35 S-21

RM 8 6 0 3 HGRL/NIST R-23,35 S-21 Magnesite ML- 1 IGEM R- 12 S- 1,4,10

ML-2 IGEM R-12 S-1,4,10 ML-3 IGEM R-12 S-1,4,10 ML-9 IGEM R-12 S-1,4,10 ML-12 IGEM R-12 S-1,4,10 ML-13 IGEM R-12 S-1,4,10

Manganese nodule GSPN-1 IRMA S-17 GSPN-2 IRMA S-17 GSPN-3 IRMA S-17 JMn-1 GSJ R-34 S-7 2388 NML/NIO R-24 S-23

Marble MSA-7 MRMRI R-32 S-31 C and O isotopes Metagabbro GPME 404 RIAP R-1 S-2 Metahyperbasite GPME 502 RIAP R-1 S-2 Metasomatite GPME 501 RIAP R-1 S-2 Mierogabbro PM-S IWG-GIT R-8,10 S-9 Molybdenum ore RM 8 6 0 5 HGRL/NIST R-23,35 S-21

RM 8 6 0 6 HGRL/NIST R-23,35 S-21 Pegmatite OPEG CORM R-31 S-28 Peridotite WPR-1 CCRMP R-2,4 S-5 Au, PGE Platinum Group element- GPt-1 to -6 IGGE, MGMR R-20 S-11 Au, PGE bearing sample

PTC-la CCRMP R-2,4 S-5 Au, PGE PTM-la CCRMP R-2,4 S-5 Au, PGE

Pyrrhotine RP-1 to -4 IGEM R-12 S-1,4,10 PGE Quartz diorite SKD-1 IGI R-26,27 S-1,4,25 Rare Earth element ore

TRV UNS R-36 S-29,4 Rhyolite JR-3 GSJ R-33 S-7

ORCA-1 CORM R-31 S-28 Schist GPME 101 RIAP R-1 S-2 Old SSL-1

GPME 504 RIAP R-1 S-2 MI UNS R-36 S-29,4

Sediment estuarine marine SRM 1646a NIST R-23,35 S-21 GSMS-1 IRMA S-17 GSMS-2 IRMA S-17 GSMS-3 IRMA S-17 MESS-2 NRCC R-22 S-22

Serpentine GPME 503 RIAP R-1 S-2 Sludge CRM 145R BCR R-13,38 S-13 Soil CRM 142R BCR R-13,38 S-13

BPGM-1 PCSMC S-18 PL-1 PCSMC S-18 SChT RIAP S-27

Page 4: Geochemical reference materials: Update 1996

1438

Table 1 (Continued.)

L Roelandts / Spectrochimica Acta Part B 51 (1996) 1435-1441

Sample name Sample code P r o d u c e r Certification Supplier(s) Remarks

SDPS RIAP SKR RIAP SSK RIAP

Sulphide ore MII UNS R-36 RTS-1 to 4 CCRMP R-2,4 WMS-1 CCRMP R-2,4

Sviatonossite SSV- 1 IGI R-26,27 Syenite JSy-1 GSJ R-34 Trachyte ISH-G IWG-GIT R-5,10

KT-1 KIGMM MDO-G IWG-GIT R-5,10

Tungsten ore RM 8 6 0 7 HGRL/NIST R-23,35 RM 8 6 0 8 HGRL/NIST R-23,35

Ultramatic ore UMT-1 CCRMP R-2,4 Ultramatic rock NGRI-U NGRI R-6 Zinc ore RM 8 6 0 4 HGRL/NIST R-23, 35 Zinnwaldite ZW-C IWG-GIT R-9,10 Zircon 5 samples 17,-39

S-27 S-27 S-27 S-29,4 S-5 S-5 S-1,4,25 S-7 S-9 S-15 S-9 S-21 S-21 S-5 S-20 S-21 S-9 S-9

Au,PGE

Ar dating

Ar dating

Au, PGE

U,Th, Pb, Lu-I-If REE

In Table 1:

(1) The name of the material is given in the first column. (2) The sample code, i.e. the usual abbreviations given by the originator, is shown in column two. (3) The acronym of the producer is stated in the third column. (4) References of certification, reports, catalo- gues or preliminary information are identified by a number preceded by the letter R. The num- ber in the relevant column refers to the list pre- sented in Table 2. (5) The supplier from whom the material may be obtained is identified in a similar manner (using S as the first letter). The name and addresses of the suppliers of the reference materials mentioned in Table 1 are given in Table 3. In this manner, readers are able to obtain further information directly from such sources (catalogue, price list, quantity of the supply, details of the purchase procedure, etc.). (6) Specific remarks that may assist readers in their choice of samples are indicated in the last column.

In the scope of the present paper, we feel that a list of selected recent compilation of elemental concen- tration data for geochemical reference materials will be of greatest interest to the readers. That can be found in Table 4.

In preparing this update, unfortunate oversights might have occurred and many materials possibly used as standards may have been omitted for whatever reasons. In such cases we apologise to the readers. We will also ask them insistently to inform us of their remarks and suggestions so that we can take these into account in the future, and improve the usefulness of this column. Producers and suppliers of reference materials are invited to send pertinent information about their products and services at the address given above.

Acknowledgements

I am grateful to Professor P.W.J.M. Boumans for the enthusiasm he has invested in the present refer- ence material column.

Page 5: Geochemical reference materials: Update 1996

L Roelandts / Spectrochimica Acta Part B 51 (1996) 1435-1441 1439

Table 2 Compilation

R1 R-2 R-3 R-4 R-5 R-6 R-7 R-8 R-9 R-10 R-11 R-12 R-13 R-14 R-15 R-16 R-17 R-18 R-19 R-20 R-21 R-22 R-23 R-24 R-25 R-26

R-27

R-28 R-29 R-30 R-31 R-32 R-33 R-34 R-35 R-36 R-37 R-38 R-39

R-40

LBerkovits, Geostand. Newsl., 18 (1994) 331. W.S. Bowman, Catalogue of Certified Reference Materials, CCRMP94-1E. W.S. Bowman, Geostand. NewsL, 19 (1995) 101. CCRMP Certificate of analysis. P.Y. Gillot, Y. Cornette, N. Max and B. Floris, Ocostand. Newsl., 16 (1992) 55. P.K. Govfl, Geostand. Newsl., 19 (1995) 256. IC Govindaraju, Geostand. NewsL, 18 (1994) Special Issue IC Govindaraju, P.J. Ports, P.C. Webb and J.S. Watson, Geostand. Newsl., 18 (1994) 211. IC Govindaraju, I. Rubeska and T. Paukert, Geostand. Newsl., 18 (1994) 1. K. Govindaraju, Geostand. Newsl., 19 (1995) Special Issue. P.R. Hooper, S.P. Reidel, D.M. Johnson and C.M. Knaack, Geostand. Newsl., 18 (1994) 203. IOEM. Certificate of Analysis Institute for Reference Materials and Measurements (IRMM) BCR reference materials, 1996. IPT Certificate of analysis J.J. LaBrecque and H. Schorin, Fresenius J. Anal. Chem., 342 (1992) 299. J.J. LaBrecque and H. Schorin, Fresenius J. Anal. Chem., 342 (1992) 306. J.J. LaBrecque, D.V. de Leyt and C. Vazquez, Fresenius J. Anal. Chem., 351 (1995) 164. X.Li and C.Tong, Geostand. NewsL, 19 (1995) 25. Ministry of Geology, China. Certificate of analysis. MINTEK Report no 411. Minzvetmet USSR, Krasnojarsk, 1977, p 3 and 10. National Research Council of Canada--Certificate of Analysis. NIST SRM Certificate. L.P. Pandey, Certificate of analysis of sample no 2388. National Metallurgical Laboratory, Jamsbedpur, 1992. M.L.Patino-Douce, A. Patino-Douce, M. Qayyum and R.L. Nielsen. Geostand. NewsL, 18 (1994) 195. L.L.Petrov, Yu.N. Kormakov and L.A. Persikova "Development of Standard Rock Specimens for Laboratory Services in the Academy of Sciences, The Ministry of Geology and other Organizations". State Regis~ation No 01860009250, Irkutsk, 1990. L.L.Petrov, L.A.Persikova and Yu. N. Komakov. 1993 Catalogue of reference materials of mineral substance composition. Russian Academy of Sciences, Siberian Branch, Institute of Geochemistry. Irkutsk. P.J. Ports, C.B. Cowing and K. Govindaraju, Gcostand. Newsl., 16 (1992) 81. P. Quevauviller, H. van der Staak, D. van Loenen, W. Kingerak and B. Oriepink, Fresenius J. Anal. Chem., 350 (1994) 101. A. Reay, R.D. Johnstone and Y. Kawachi, Geostand. Newsl., 17 (1993) 135. J.M. Richardson, Analyst, 120 (1995) 1513. Ye.D. Syngayevskiy, C~ochem. Intemat., 29 (7) (1992) 134. S.Terashima, S.Itoh, M.Ujiie, H.Kamioka, T. Tanaka and M.Hattori, Gcostand. Newsl., 17 (1993) 1. S. Terashima, A. Usui and N. Imai, Geostand. Newsl., 19 (1995) 221. N.M. Trahey, NIST Standard Reference Materials Catalog (1995-96 edition) NIST Spec. Publ. 260 (January 1995). Ustav Nerotsnych Surovin (UNS). Certificate of Analysis. J.W. Valley, N. Kitchen, M.J. Kolm, C.R. Niendorf and M.L Spicuzza, Gea~him. Cosmochim. Acta, 59 (1995) 5223. K. Vercoutere, U. Fortunati, H. Muntau, B. Griepink and E.A. Maier, Fresenius J. Anal. Chem., 352 (1995) 197. M. Wiedenbeck, P. Alle, F. Corfu, W.L. Griffin, M. Meier, F. Oberli, A. Von Quadt, J.C. Roddick and W. Spiegel, Geostand. Newsl., 19 (1995) 1. M. Yan, C. Wang, Q. Cao, T. Gu and Q. Chi, Geostand.Newsl., 19 (1995) 125.

Page 6: Geochemical reference materials: Update 1996

1440 L Roelandts / Spectrochimica Acta Part B 51 (1996) 1435-1441

Table 3 Sources of supply

S-1 S-2 S-3 S-4 S-5

S-6 S-7 S-8 S-9 S-10

S-11 S-12

S-13 S-14 S-15 S-16 S-17

S-18

S-19 S-20 S-21

S-22

S-23

S-24 S-25 S-26 S-27 S-28

S-29 S-30 S-31 S-32 S-33

Association of Reference Materials Producers, 4 Krasnoarmeyskaya Street, Sverdiovsk 620219, Russia. L. Berkovits, Research Institute of Applied Physics (RIAP) 20, Gagarin Blvd, 664003, Irkutsk, Russia. Brammer Standards Co, 14603 Benfer Road, Houston, Texas 77069 USA. Breitl/inder, Eichproben und Labormaterial GmbH. Postfach 8046 D-4700 Harem 3, Federal Republic of Germany. Canadian Certified Reference Materials Project (CCRMP), Mineral Sciences Laboratories, CANMET, 555 Booth Street, Ottawa, K1A OG1, Canada. DASO Standards Inc., Podebradova 73, 61200 Brno, Czech Republic. Geological Survey of Japan, 1-1-3 Higashi, Tsukuba, Ibaraki 305, Japan. Geological Survey of Slovakia. Geostandards, 15, rue Notre-Dame-des-Panvres, B.P.20, F54501 Vandoeuvre-16s-Nancy Cedex, France. Institute of Geology of ore deposits, petrography, Mineralogy and Geochemistry (IGEM), Staromonetny per.35, 109017 Moscow, Russia. Institute of Geophysical and Geochemical Exploration (IGGE), Langfang, Hebei 102849, People's Republic of China. Instituto de Pesquisas Tecnologicas do Estado de S~o Panlo S/A OPT), Cidade Universitaria Armando de Salles Oliveira, 05508 San Paulo - SP, Brazil. Institute for Reference Materials and Measurements (IRMM) Retieseweg, B2440 Geel, Belgium. Korea Institute of Energy and Resources. Korea Institute of Geology, Mining and Materials. J.J. LaBrecque, Instituto Venezolano de Investigaciones Cientificas (IVIC), Apartado 21827, Caracas, 1020A, Venezuela. Li Jiaxi and Wang Yimin, Institute of Rock and Mineral Analysis, Chinese Academy of Geological Sciences, 26 Baiwanzhuang Road, Beijing 100037, People's Republic of China. J. Lipinski, Polish Committee for Standardization, Measures and Quality Control, Division of Physical Chemistry, ui. Elektoralna 2, P.O. Box P-1000-950, Warszawa, Poland. Ministry of Geology. People's Republic of China. National Geophysical Research Institute, Geochemistry Group, Hyderabad 500007, India. National Institute of Standards and Technology (NIST), Standard Reference Materials Program, Building 202, Room 205, Gaithersburg, MD 20899-0001, USA. National Research Council of Canada (NRCC), Institute of Environmental Chemistry, Montreal Road, Ottawa K1A OR6 Canada. L.P. Pandey, Head, Analytical Chemistry and Standard Samples Division, National Metallurgical Laboratory, Jamshedpur- 7, India. M.L. Patino-Douce, Department of Geology, University of Georgia, Athens, Ga.30602, USA. L.L. Petrov, Russian Academy of Sciences, Institute of Geochemistry, P.O. Box 4019, Irkutsk 664033, Russia. A. Reay, Department of Geology, University of Otago, P.O. Box 5 6, Dunedin, New Zealand. Research Institute of Applied Physics of the Irkutsk University, 20 Gagarin Blvd, Irkutsk, 664003 Russia. J.M. Richardson, Quality Control Supervisor, Geoscience Laboratories, Ontario GEOServices Centre, Sudbury, Ontario P3E 6B5 Canada. Sluzba Vyzhumu, Konevova 131, 13086 Praha 3, Czech Republic. South African Bureau of Standards, Private Bag X191, Pretoria 0001, South Africa. Ye.D. Syngayevskiy, All=Union Mineral Raw Material Research Institute, Moscow, Russia. J.M. Valley, Department of Geology and Geophysics, University of Wiscosin, Madison, WI 53706, USA. C. Vazquez, Comision National de Energia Atomica, Av. del Libertador, 8250 (1429), Buenos Aires, Argentina.

Page 7: Geochemical reference materials: Update 1996

I. Roelandts / Spectrochimica Acta Part B 51 (1996) 1435-1441

Table 4 Selected compilation of elemental concentration data for "old" geochemical reference materials

1441

Year Material Ref.

1992 USGS rock standards: AGV-1, GSP-1 and G-2 [9] GSJ reference samples: REE, Sc, Y, Zr and Hf (26 samples) [10] GIT-IWG reference samples: CHR-Pt+ and CHR-Bkg [11] Rocks, minerals, sediments, soils, refractories and ores [12] USGS manganese nodules: REE in Nod-A-1 and Nod-P-1 [13] INCT: CTA-AC-1 (apatite) and CTA-FFA-1 (fly ash) [14] NIST standard reference materials (update) [15] Working values for 272 international geostandards [16] GIT-IWG reference samples AN-G, BE-N and MA-N [17] USGS shale SDO-1 [18] 14 South African rocks (SAROC): SARM 39 to 52 [19] Working values for 383 geostandards [20] Metabasic MB-H (India) [21] 5 Belgian sedimentary rocks: AWI-1,SBO-1, PRI-1, CCH-1 and DWA-1 [22] GSJ "igneous rocks series" (major elements) [23] GIT-IWG reference samples: AL-I and IF-G [24] Working values for 26 CRPG, ANRT and IWG-GIT geostandards [25] GSJ "igneous rock series" (minor and trace elements) [26]

1993

1994

1995

References

[1] Spectrochim. Acta Part B, 46, No.12 (1991) "Special Issue dedicated to Reference Materials and Methods".

[2] I.Roelandts, Spectroehim. Acta, Part B, 44 (1989) 5. [3] I.Roelandts, Spectrochim. Acta, Part B, 44 (1989) 925. [4] l.Roelandts, Spectrochim. Acta, Part B, 46 (1991) 1299. [5] I.Roelandts, Spectrochim. Acta, Part B, 47 (1992) 935. [6] I.Roelandts, Spectrochim. Acta, Part B, 48 (1993) 1291. [7] I.Roelandts, Spectrochim. Acta, Part B, 51 (1996) 189. [8] Geostandards Newsletter, C.R.P.G., B.P. 20, F-54501 Van-

doeuvre-16s-Nancy C6dex, France. [9] E.S.Gladney, E.A.Jones, E.J. Nickell and I. Roelandts, Geo-

stand. Newsl., 16 (1992) 111. [10] S. Itoh, S. Terashima, N. Imai, H. Kamioka, N. Mita and A.

Ando, Bull. Geol. Surv. Japan, 43 (1992) 659; also Geostand. Newsl., 17 (1993) 5.

[11] P.J. Potts, C.J.B. Gowing and K. Govindaraju, Geostand. Newsl., 16 (1992) 81.

[12] P.J. Potts, A.G. Tindle and P.C. Webb, Geochemical Refer- ence Material Compositions: rocks, minerals, sediments, soils, carbonates, refractories and ores used in research and industry, Whittles Publishing, CRC Press Inc., Great Britain 1992, 313 pp.

[13] I. Roelandts, Spectrochim. Acta, Part B, 47 (1992) 947. [14] R. Dybczynski, H. Polkowska-motrenko, Z. Samczynski and

Z. Szopa, Fresenius'J. Anal. Chem., 345 (1993) 99. [15] E.S. Gladney, B.T. O'Malley, I. Roelandts and T.E. Gills,

NIST Spec. Publ. 260-111, Update to 1987 ed., November 1993.

[16] K.Govindaraju, Chap. 7, In: C. Riddle (Ed.), Analysis of Geo- logical Materials, Marcel Dekker Inc., New York, 1993.

[17] K. Govindaraju and I. Roelandts, Geostand. Newl., 17 (1993) 227.

[18] J.S. Kane, U.S. Geol. Surv. Bull., 2046 (1993). [19] E.J. Ring, MINTEK Report No M393; also Geostand. Newsl.,

17 (1993) 137. [20] K. Govindaraju, Geostand. Newsl., 18 (Special Issue) (1994). [21] M.S. Rathi, P.P. Khanna, P.K. Mukherjee, K.K. Purohit and

N.K. Saini, J. Geol. Soc. India, 43 (1994) 295. [22] I. Roelandts and J.C. Duchesne, Geostand. Newsl., 18 (1994)

143. [23] S. Terashima, N. Imai, S. Itoh, A. Ando and N. Mita, Bull.

Geol. Surv. Japan, 45 (1994) 305. [24] K. Govindaraju, Geostand. Newsl., 19 (1995) 55. [25] K. Govindaraju, Geostand. Newsl., 19 (Special Issue) (1995). [26] N. Imai, S. Terashima, S. Itoh and A. Ando, Geostand. Newsl.,

19 (1995) 135.