GEOPT19 - AN INTERNATIONAL PROFICIENCY TEST FOR ANALYTICAL GEOCHEMISTRY LABORATORIES REPORT ON ROUND 19 / July 2006 (Gabbro, MGR-N)

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1 GEOPT19 - AN INTERNATIONAL PROFICIENCY TEST FOR ANALYTICAL GEOCHEMISTRY LABORATORIES REPORT ON ROUND 19 / July 2006 (Gabbro, MGR-N) Peter C. Webb 1 *, Michael Thompson 2, Philip J. Potts 1 and B. Batjargal 3 1 Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes, MK7 6AA, UK. 2 Department of Chemistry, Birkbeck College, Gordon House, London, WC1H 0PP, UK. 3 Central Geological Laboratory, Trade Union Street, Ulaanbaatar-37, Mongolia. *Corresponding author: p.c.webb@open.ac.uk Keywords: Proficiency testing, quality assurance, GeoPT, GeoPT19 round, MGR-N, gabbro Abstract Results are presented for GeoPT19, round nineteen of the GeoPT international proficiency testing programme for analytical geochemistry laboratories. The sample distributed for this round was MGR-N, a gabbro, supplied by B. Batjargal, Central Geological Laboratory, Ulaanbaatar, Mongolia. In this report, contributed data are listed, together with an assessment of assigned values, z-scores and charts showing both the distribution of contributed results and the overall performance of participating laboratories. participating laboratories with z-score information for each reported elemental determination, from which the laboratories can decide whether the quality of their data is satisfactory in relation to both their chosen fitness-for-purpose criterion and results submitted by all the other laboratories contributing to the round and, therefore, choose to take corrective action if this appears justified. Full details of the programme have been included in reports of previous rounds, the current publication status of which is listed in Appendix 1. Introduction This nineeenth round of the international proficiency testing programme, GeoPT19, was conducted in a similar manner to earlier rounds. The programme is designed to be part of the routine quality assurance scheme of analytical geochemistry laboratories and the aims of the programme can be reviewed at The programme is organised by the International Association of Geoanalysts and is conducted in accordance with a published protocol ( The overall aim of the programme is to provide Steering Committee for Round 19: M. Thompson (Chair), P.J. Potts (Secretary) and P.C. Webb (Results coordinator). Sample GeoPT19: MGR-N, a gabbro, was supplied ready packaged by B. Batjargal, (Central Geological Laboratory, Ulaanbaatar, Mongolia). The test material was tested for homogeneity according to the revised (2006) International Harmonised Protocol (Pure Appl Chem, 2006, 78, ), for the following elements (SiO 2, TiO 2, Al 2 O 3, Fe 2 O, MnO, MgO, CaO, Na 2 O, K 2 O, P 2 O 5, Rb, Sr, Y, Zr, Nb, Ba, GeoPT18 Report 1 Jan 2006

2 Pb, Th, U, Sc, V, Cr, Co, Ni, Cu, Zn, Ga, Mo, As, S). No lack of sufficient homogeneity was detected, and this material was therefore considered suitable for use in the GeoPT proficiency testing programme. Timetable for GeoPT19: Distribution of sample: March Deadline for submission of analytical results: 15th June Distribution of draft report: August 2006 Submission of results Results submitted by the seventy-six laboratories that participated in this round are listed in Table 1. All of these data were used for the assessment of assigned values. Assigned values Following procedures described in earlier rounds, a robust statistical procedure was used to derive assigned concentration values [Xa], these being judged to be the best estimates of the true composition of this sample. Data in Table 2 lists assigned values for 8 major components and both assigned and provisional values for 36 trace elements. Values were assigned on the basis that: (i) sufficient laboratories had contributed data for an element, (ii) the statistical assessment gave confidence that the results showed a central portion approximating to a normal distribution. Part of this assessment involved examining a bar chart for each element to judge the distribution of results. Bar charts for elements/components shown in Figure 1 were judged to have satisfactory distributions and values were assigned, namely: SiO 2, TiO 2, Al 2 O 3, Fe 2 O 3 T, MnO, MgO, CaO, Na 2 O, As, Ba, Be, Cd, Ce, Co, Cr, Cs, Cu, Dy, Er, Eu, Ga, Gd, Hf, Ho, La, Li, Lu, Nd, Ni, Pb, Pr, Sb, Sc, Sm, Sr, Tb, Tm, U, V, W, Y, Yb, Zn, and Zr. Of these, the elements As, Cd, Cr, Li, Pb, Sb, W and Zr were assigned provisional values, Bar charts in Figure 2 show distribution data for elements that were not judged to be sufficiently satisfactory in the statistical analysis to assign values, and z-scores are plotted for guidance only. Thus, values were not assigned to the following elements/components, despite the availability for some, of a sufficient number of analytical results: K 2 O, P 2 O 5, CO 2, Fe(II)O, LOI, Ag, Bi, Ge. Bar charts in Figure 3 are plotted for information only, for those elements/components i.e. H 2 O +, Cl, F, Mo, Nb, Rb, S, Se, Sn, Ta, Th and Tl, where the statistical analysis was sufficiently unsatisfactory to be able to assign values or insufficient data were reported to allow any assessment to be made. Z-score analysis As in previous rounds, laboratories were invited to choose one of two performance standards against which their analytical results would be judged: Data quality 1 for laboratories working to a 'pure geochemistry' standard of performance, where analytical results are designed for geochemical research and where care is taken to provide data of high precision and accuracy, sometimes at the expense of a reduced sample throughput rate. Data quality 2 for laboratories working to an 'applied geochemistry' standard of performance, where, although precision and accuracy are still important, the main objective is to provide results on large numbers of samples collected, for example, as part of geochemical mapping projects or geochemical exploration programmes. The target standard deviation (Ha) for each element assessed was calculated from a modified form of the Horwitz function as follows: Ha = k.xa Where Xa is the concentration of the element expressed as a fraction, and the factor k = 0.01 for pure geochemistry labs and k=0.02 for applied geochemistry labs. Z-scores were calculated for each elemental result submitted by each laboratory from: z = [X - Xa] / Ha GeoPT18 Report 2 Jan 2006

3 where X is the contributed result, Xa is the assigned value and Ha is the target standard deviation. Z-score results are listed in Table 3 and participating laboratories are invited to assess their performance using the following criterion: Z-score results in the range -2<z<2 are considered to be 'satisfactory' (in the sense that no action is called for by the participant). If the z-score for any element falls outside this range, contributing laboratories are advised to examine their procedures to ensure that determinations are not subject to unsuspected analytical bias. report. The GeoPT programme is organised on behalf of the International Association of Geoanalysts. Overall performance A summary of the overall performance of individual laboratories in this round is plotted in Figure 4 as a multiple z-score chart. In this chart, the z-score performance for each element is distinguished by symbols that make it simple to identify whether the results were satisfactory or gave z-scores that exceeded the action limits. This chart is designed to help individual laboratories to judge their overall performance in this proficiency testing round. For this sample there were a larger range of elements than usual for which no assigned value could be given. There also appear to be many higher z-scores than is usual. Initial indications are that the high Ca content of this sample may pose problems that are not usually encountered, and possibly that more elements than usual were close to detection limits for some techniques. Participation in future rounds The benefit from proficiency testing arises from regular participation and laboratories are invited to contribute to the GeoPT20 round, the sample for which will be distributed during September Acknowledgements The authors thank John Watson and Liz Lomas (OU) for valued assistance with the production of this GeoPT18 Report 3 Jan 2006

4 Appendix 1 Publication status of proficiency testing reports GeoPT1 Thompson M., Potts P.J., Kane J.S. and Webb P.C. (1996) GeoPT1. International proficiency test for analytical geochemistry laboratories - Report on round 1. Geostandards Newsletter: The Journal of Geostandards and Geoanalysis, 20, GeoPT2 Thompson M., Potts P.J., Kane J.S., Webb P.C. and Watson, J.S. (1998) GeoPT2. International proficiency test for analytical geochemistry laboratories - Report on round 2. Geostandards Newsletter: The Journal of Geostandards and Geoanalysis, GeoPT3 Thompson M., Potts P.J., Kane J.S. and Chappell B.W. (1999a) GeoPT3. International proficiency test for analytical geochemistry laboratories - Report on round 3. Geostandards Newsletter: The Journal of Geostandards and Geoanalysis, 23, GeoPT4 Thompson M., Potts P.J., Kane J.S., Webb P.C. and Watson J.S. (1999b) GeoPT4. International proficiency test for analytical geochemistry laboratories - Report on round 4. Published in the electronic version of Geostandards Newsletter: The Journal of Geostandards and Geoanalysis (Summer 2000). GeoPT5 Thompson M., Potts P.J., Kane J.S., and Wilson S. (1999c) GeoPT5. International proficiency test for analytical geochemistry laboratories - Report on round 5. Published in the electronic version of Geostandards Newsletter: The Journal of Geostandards and Geoanalysis (Summer 2000). GeoPT6 Potts P.J., Thompson M., Kane J.S., Webb P.C. and Carignan J. (2000) GEOPT6 - an international proficiency test for analytical geochemistry laboratories - report on round 6 (OU-3: Nanhoron microgranite) and 6A (CAL-S: CRPG limestone). International Association of Geoanalysts: Unpublished report. GeoPT7 Potts P.J., Thompson M., Kane J.S., and Petrov L.L. (2000) GEOPT7 - an international proficiency test for analytical geochemistry laboratories - report on round 7 (GBPG-1 Garnetbiotite plagiogneiss). International Association of Geoanalysts: Unpublished report. GeoPT8 Potts P.J., Thompson M., Kane J.S., Webb, P.C. and Watson J.S. (2000) GEOPT8 - an international proficiency test for analytical geochemistry laboratories - report on round 8 / February 2001 (OU- 4 Penmaenmawr microdiorite). International Association of Geoanalysts: Unpublished report. GeoPT9 Potts P.J., Thompson M., Webb, P.C. and Watson J.S. (2001) GEOPT9 - an international proficiency test for analytical geochemistry laboratories - report on round 9 / July 2001 (OU-6 Penrhyn slate). International Association of Geoanalysts: Unpublished report. GeoPT10 Potts P.J., Thompson M., Webb, P.C., Watson J.S. and Wang Yimin (2001) GEOPT10 - an international proficiency test for analytical geochemistry laboratories - report on round 10 / December 2001 (CH-1 Marine sediment). International Association of Geoanalysts: Unpublished report. GeoPT11 Potts P.J., Thompson M., Chenery S.R., Webb, P.C. and Watson J.S. (2002) GEOPT11 - an international proficiency test for analytical geochemistry laboratories - report on round 11 / July 2002 (OU-5 Leaton dolerite). International Association of Geoanalysts: Unpublished report. GeoPT12 Potts P.J., Thompson M., Chenery S.R., Webb, P.C. and Batjargal B. (2003) GEOPT12 - an international proficiency test for analytical geochemistry laboratories - report on round 12 / January 2003 (GAS Serpentinite). International Association of Geoanalysts: Unpublished report. GeoPT13 Potts P.J., Thompson M., Chenery S.R., Webb, P.C. and Kaspar H.U. (2003) GEOPT13 - an international proficiency test for analytical geochemistry laboratories - report on round 13 / July 2003 (Köln Loess). International Association of Geoanalysts: Unpublished report. GeoPT14 Potts P.J., Thompson M., Chenery S.R., Webb, P.C. and B. Batjarga (2004) GeoPT14 - an international proficiency test for analytical geochemistry laboratories - report on round 14 / January 2004 (OShBO - alkaline granite). International Association of Geoanalysts: Unpublished report. GeoPT15 Potts P.J., Thompson M., Chenery S.R., Webb, P.C. and WANG Yimin (2004) GeoPT15 - an international proficiency test for analytical geochemistry laboratories - report on round 15 / June 2004 (Ocean floor sediment MSAN). International Association of Geoanalysts: Unpublished report. GeoPT16 Potts P.J., Thompson M., Webb, P.C. and S.Wilson (2005) GeoPT16 - an international proficiency test for analytical geochemistry laboratories - report on round 16 / February 2005 (Nevada basalt, BNV-1). International Association of Geoanalysts: Unpublished report. GeoPT17 Potts P.J., Thompson M., Webb, P.C. and J. Nicholas Walsh (2005) GeoPT17 - an international proficiency test for analytical geochemistry laboratories - report on round 17 / July 2005 (Calcareous sandstone, OU-8). International Association of Geoanalysts: Unpublished report. GeoPT18 Webb, P.C., Thompson M., Potts P.J. and L. Paul Bedard (2006) GeoPT18 - an international proficiency test for analytical geochemistry laboratories - report on round 18 / Jan 2006 (Quartz Diorite, KPT-1). International Association of Geoanalysts: Unpublished report GeoPT18 Report 4 Jan 2006

5 Table 1 GeoPT19 Analytical results submitted (June 2006) Gabbro MGR-N Note: There is no T4 Round identifier T1 T2 T3 T5 T5 T6 T7 T8 T9 T10 T11 T11 T12 T13 T13 Sample MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N Data quality SiO2 % m/m TiO2 % m/m Al2O3 % m/m Fe2O3 % m/m Fe(II)O % m/m MnO % m/m MgO % m/m CaO % m/m Na2O % m/m K2O % m/m P2O5 % m/m H2O+ % m/m CO2 % m/m LOI % m/m Ag 0.33 As Au B Ba Be Bi Br 0 Cd Ce Cl 146 Co Cr Cs Cu Dy Er Eu F 283 Ga Gd Ge Hf Hg Ho I In Ir La Li Lu Mo N 140 Nb Nd Ni Os Pb Pd Pr Pt Rb Re Rh Ru S Sb Sc Se Sm Sn Sr Ta Tb Te Th Tl Tm 0.06 U V W 3 Y Yb Zn Zr

6 Table 1 Round identifier Sample Data quality SiO2 % m/m TiO2 % m/m Al2O3 % m/m Fe2O3 % m/m Fe(II)O % m/m MnO % m/m MgO % m/m CaO % m/m Na2O % m/m K2O % m/m P2O5 % m/m H2O+ % m/m CO2 % m/m LOI % m/m Ag As Au B Ba Be Bi Br Cd Ce Cl Co Cr Cs Cu Dy Er Eu F Ga Gd Ge Hf Hg Ho I In Ir La Li Lu Mo N Nb Nd Ni Os Pb Pd Pr Pt Rb Re Rh Ru S Sb Sc Se Sm Sn Sr Ta Tb Te Th Tl Tm U V W Y Yb Zn Zr GeoPT19 Analytical results submitted (June 2006) Gabbro MGR-N T14 T15 T16 T17 T18 T19 T20 T21 T22 T22 T23 T23 T24 T24 T25 MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N

7 Table 1 Round identifier Sample Data quality SiO2 % m/m TiO2 % m/m Al2O3 % m/m Fe2O3 % m/m Fe(II)O % m/m MnO % m/m MgO % m/m CaO % m/m Na2O % m/m K2O % m/m P2O5 % m/m H2O+ % m/m CO2 % m/m LOI % m/m Ag As Au B Ba Be Bi Br Cd Ce Cl Co Cr Cs Cu Dy Er Eu F Ga Gd Ge Hf Hg Ho I In Ir La Li Lu Mo N Nb Nd Ni Os Pb Pd Pr Pt Rb Re Rh Ru S Sb Sc Se Sm Sn Sr Ta Tb Te Th Tl Tm U V W Y Yb Zn Zr GeoPT19 Analytical results submitted (June 2006) Gabbro MGR-N T26 T26 T27 T28 T29 T30 T31 T32 T33 T34 T35 T36 T37 T38 MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N

8 Table 1 Round identifier Sample Data quality SiO2 % m/m TiO2 % m/m Al2O3 % m/m Fe2O3 % m/m Fe(II)O % m/m MnO % m/m MgO % m/m CaO % m/m Na2O % m/m K2O % m/m P2O5 % m/m H2O+ % m/m CO2 % m/m LOI % m/m Ag As Au B Ba Be Bi Br Cd Ce Cl Co Cr Cs Cu Dy Er Eu F Ga Gd Ge Hf Hg Ho I In Ir La Li Lu Mo N Nb Nd Ni Os Pb Pd Pr Pt Rb Re Rh Ru S Sb Sc Se Sm Sn Sr Ta Tb Te Th Tl Tm U V W Y Yb Zn Zr GeoPT19 Analytical results submitted (June 2006) Gabbro MGR-N T39 T40 T41 T42 T43 T44 T45 T46 T47 T48 T49 T50 T51 T52 T53 MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N

9 Table 1 Round identifier Sample Data quality SiO2 % m/m TiO2 % m/m Al2O3 % m/m Fe2O3 % m/m Fe(II)O % m/m MnO % m/m MgO % m/m CaO % m/m Na2O % m/m K2O % m/m P2O5 % m/m H2O+ % m/m CO2 % m/m LOI % m/m Ag As Au B Ba Be Bi Br Cd Ce Cl Co Cr Cs Cu Dy Er Eu F Ga Gd Ge Hf Hg Ho I In Ir La Li Lu Mo N Nb Nd Ni Os Pb Pd Pr Pt Rb Re Rh Ru S Sb Sc Se Sm Sn Sr Ta Tb Te Th Tl Tm U V W Y Yb Zn Zr GeoPT19 Analytical results submitted (June 2006) Gabbro MGR-N T54 T54 T55 T56 T57 T58 T59 T60 T61 T62 T63 T64 T65 T66 T67 MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N

10 Table 1 Round identifier Sample Data quality SiO2 % m/m TiO2 % m/m Al2O3 % m/m Fe2O3 % m/m Fe(II)O % m/m MnO % m/m MgO % m/m CaO % m/m Na2O % m/m K2O % m/m P2O5 % m/m H2O+ % m/m CO2 % m/m LOI % m/m Ag As Au B Ba Be Bi Br Cd Ce Cl Co Cr Cs Cu Dy Er Eu F Ga Gd Ge Hf Hg Ho I In Ir La Li Lu Mo N Nb Nd Ni Os Pb Pd Pr Pt Rb Re Rh Ru S Sb Sc Se Sm Sn Sr Ta Tb Te Th Tl Tm U V W Y Yb Zn Zr GeoPT19 Analytical results submitted (June 2006) Gabbro MGR-N T68 T69 T69 T70 T71 T72 T73 T74 T75 T76 T77 MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N

11 Table 2 GeoPT19 Assigned values and robust statistical analysis of contributed data (Gabbro, MGR-N) X a H a sdm sdm/h a status X a H a sdm sdm/h a status % m/m % m/m % m/m mg/kg mg/kg mg/kg SiO Assigned Hf Assigned TiO Assigned Ho Assigned Al 2 O Assigned La Assigned Fe 2 O 3 T Assigned Li Provisional MnO Assigned Lu Assigned MgO Assigned Nd Assigned CaO Assigned Ni Assigned Na 2 O Assigned Pb Provisional mg/kg mg/kg mg/kg Pr Assigned As Provisional Sb Provisional Ba Assigned Sc Assigned Be Assigned Sm Assigned Cd Provisional Sr Assigned Ce Assigned Tb Assigned Co Assigned Tm Assigned Cr Provisional U Assigned Cs Assigned V Assigned Cu Assigned W Provisional Dy Assigned Y Assigned Er Assigned Yb Assigned Eu Assigned Zn Assigned Ga Assigned Zr Provisional Gd Assigned

12 Table 3 GeoPT19 Z-scores for analytical results submitted (June 2006) Gabbro MGR-N Note: There is no T4 Labcode T1 T2 T3 T5 T5 T6 T7 T8 T9 T10 T11 T11 T12 T13 T13 Sample MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N Quality SiO * * * * TiO * * * * Al 2 O * * * Fe 2 O * * * MnO * * * MgO * * * * CaO * * * Na 2 O * * * * As * * * * * * * * 1.36 * * Ba * * 3.10 * 0.78 * * 9.60 * * Be * * * * * * * * * * * 0.21 * * Cd * * * * * * * * * * * * Ce * * * * * * 6.94 * 1.49 * * Co * * * * * 0.80 * * Cr * * 2.53 * 0.36 * * * * Cs * * * * * * * * * * * * Cu * * * * * * Dy * * * * * * * 0.76 * * * * * Er * * * * * * 0.06 * 1.27 * * * 0.13 * * Eu * * * * * * * * * * * * * Ga * * 0.92 * 0.05 * * * * * Gd * * * * * * * 0.37 * * * * * Hf * * 0.88 * * * * 0.61 * * * * * * Ho * * * * * * * 0.77 * * * * * La * * * * * * * * * * * Li * * * * * * * * * * * * Lu * * * * * * * * * * * * * Nd * * * * * * 0.85 * * 0.40 * * Ni * * * * * * Pb * * * 0.86 * * * * * Pr * * * * * * * 1.16 * * * * * * Sb * * * * * * * * * * * * * * Sc * * * * 0.19 * * * * * * * 1.96 Sm * * * * * * 1.90 * * * * * * Sr * * * * * Tb * * * * * * * * * * * * * Tm * * * * * * * * * * * * * * U * * * * * * * * * * * * * V * * 0.00 * * * * W * * * * * * * * * * 4.08 * * * * Y * * * * 1.99 * 1.52 * * Yb * * * * * * * 1.45 * * * * * * Zn * * * * * Zr * * * * * * *

13 Table 3 GeoPT19 Z-scores for analytical results submitted (June 2006) Gabbro MGR-N Labcode Sample Quality T14 T15 T16 T17 T18 T19 T20 T21 T22 T22 T23 T23 T24 T24 T25 MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N SiO 2 TiO 2 Al 2 O 3 Fe 2 O 3 MnO MgO CaO Na 2 O As Ba Be Cd Ce Co Cr Cs Cu Dy Er Eu Ga Gd Hf Ho La Li Lu Nd Ni Pb Pr Sb Sc Sm Sr Tb Tm U V W Y Yb Zn Zr * * * * 0.43 * * * * * * * * * * * * * 0.83 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 8.78 * * * * * * * * * * 0.53 * 0.41 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 6.90 * * * * * * * * * * * * * * * * * * * 0.80 * * * 1.25 * * * * 0.26 * * * 1.52 * * * * * * 1.24 * * * * 0.11 * * * * * * * * 0.12 * * * 0.99 * * * 0.88 * * * * * * * * * * 0.04 * * * 2.30 * * * * * * 1.10 * * * 0.41 * * * * * * * * 0.44 * * * * * * 2.96 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 0.98 * * * * * * * * * * * * * * * * * * * * * * 0.79 * * * * * * * * * * * * 3.19 * 0.01 * * * 0.20 * * * 6.70 * * * 0.00 * 0.49 * * * * * * * * * * * * * * * * * * * * * * * 8.14 * * * * * * * * * * * 1.17 * * * * * * * * * * * * *

14 Table 3 GeoPT19 Z-scores for analytical results submitted (June 2006) Gabbro MGR-N Labcode Sample Quality T26 T26 T27 T28 T29 T30 T31 T32 T33 T34 T35 T36 T37 T38 T39 MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N SiO 2 TiO 2 Al 2 O 3 Fe 2 O 3 MnO MgO CaO Na 2 O As Ba Be Cd Ce Co Cr Cs Cu Dy Er Eu Ga Gd Hf Ho La Li Lu Nd Ni Pb Pr Sb Sc Sm Sr Tb Tm U V W Y Yb Zn Zr * * * * * * * * * * * * * * * 0.08 * * * * * * * * * * * * * * * * * * * 0.33 * * * * * * * * * * * * * * * * * * 0.68 * * * * * * * * * * * * * * * * * * * * * 2.40 * * * * * * * * * * * * * * * * * * 0.30 * * * * * * * * * * * * * * * * * * 0.38 * * * * * * * * * * * * * * * * * * * * * * 0.50 * * * 9.39 * * * * * * * * * * * * 0.04 * * * * * * 1.17 * * 1.20 * * * * * * * * * * 3.98 * 3.18 * * * 3.39 * * * * * * * * * * * * * * * * * * * * 2.66 * * * * * * * * * * * * * * 1.02 * * * * * * 0.61 * * * * * * * * * * * 1.54 * * * * * * 0.27 * * * * * * * * * * * * * * * * * * * * * * * * * * * * 1.32 * * * * * * 0.00 * * * * * 0.00 * * * * * * * * 0.67 * 0.28 * * * * * * * * * * * * * * * * * * * * * * * * 0.30 * * * * * * 0.23 * 2.21 * 1.58 * * * * * * * * * * *

15 Table 3 GeoPT19 Z-scores for analytical results submitted (June 2006) Gabbro MGR-N Labcode Sample Quality T40 T41 T42 T43 T44 T45 T46 T47 T48 T49 T50 T51 T52 T53 T54 MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N SiO 2 TiO 2 Al 2 O 3 Fe 2 O 3 MnO MgO CaO Na 2 O As Ba Be Cd Ce Co Cr Cs Cu Dy Er Eu Ga Gd Hf Ho La Li Lu Nd Ni Pb Pr Sb Sc Sm Sr Tb Tm U V W Y Yb Zn Zr * 0.43 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 1.83 * * * * * * * * * * * * 0.00 * 0.00 * * * * * 3.62 * * * * * * * * * * * * 2.15 * 0.40 * * * * * * 1.65 * * * * * * * * * * * * * 0.01 * * * * * * * * * 0.82 * * * 0.92 * * * * * * * * * * * * * 0.88 * * 1.45 * * * * * * 0.04 * * * * * * 0.25 * * * * * * * * * * * 0.30 * * * * * 0.18 * * * * * * * 0.05 * * * * * * * * * 0.07 * * * * * * * * * * * * * * * * * * * * * * * * * * * 0.18 * * * * * 1.12 * * * * 0.64 * * * * 1.29 * * * * 1.23 * * 0.00 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * -0.07

16 Table 3 GeoPT19 Z-scores for analytical results submitted (June 2006) Gabbro MGR-N Labcode Sample Quality T54 T55 T56 T57 T58 T59 T60 T61 T62 T63 T64 T65 T66 T67 T68 MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N SiO 2 TiO 2 Al 2 O 3 Fe 2 O 3 MnO MgO CaO Na 2 O As Ba Be Cd Ce Co Cr Cs Cu Dy Er Eu Ga Gd Hf Ho La Li Lu Nd Ni Pb Pr Sb Sc Sm Sr Tb Tm U V W Y Yb Zn Zr * * * * * * * * * * * * * * * * * * * * * * * * 1.61 * * * * * 0.21 * * * * * * * * * * * 0.23 * * * * * * * * * * * * 0.61 * * * 1.27 * * 2.22 * * * 1.17 * * * * * * * * * * * * * * * * * * * * * * * * * * 0.67 * * * * * * * * * * 0.36 * * * * * * * * * * 1.24 * * * * * * * 2.53 * 0.41 * 0.11 * * * * * * * * 1.63 * * * * * * * * 0.29 * * * * * * * * * * * * 0.09 * * * * 1.02 * * * 0.69 * * 0.91 * * 0.41 * * * * * * * 5.74 * * * * * * * * * * * * * * * * 0.94 * * 1.69 * * * 0.02 * * * * 0.43 * * * * * * * 0.91 * * * * 0.91 * * 1.16 * * * * * * * * * * 0.26 * * 2.09 * * * * * * * * * * * * * 1.03 * * * 2.81 * * * * * * * * * 0.36 * * * * * * * * * * 0.20 * * * * 0.00 * * * * * * * * * 3.33 * * * * * * * * * * 2.73 * * * * * * 0.11 * * 0.22 * * * * * * * * * 0.02 * * * 0.95 * * * * * * * 3.36 * * *

17 Table 3 GeoPT19 Z-scores for analytical results submitted (June 2006) Gabbro MGR-N Labcode Sample Quality T69 T69 T70 T71 T72 T73 T74 T75 T76 T77 MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N MGR-N SiO 2 TiO 2 Al 2 O 3 Fe 2 O 3 MnO MgO CaO Na 2 O As Ba Be Cd Ce Co Cr Cs Cu Dy Er Eu Ga Gd Hf Ho La Li Lu Nd Ni Pb Pr Sb Sc Sm Sr Tb Tm U V W Y Yb Zn Zr * * * * 0.97 * * * * * 1.47 * * * * * * * * * 0.48 * * * 0.39 * * 0.39 * * * * * * * * * * * * * * * * * * * * * * * * * 1.81 * * * * * * * * * * * * * * * * 0.35 * * * * * * * * * 0.62 * * * * * * * * * * * * * * * * * * * * 0.92 * * * * * * 0.44 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 1.48 * 0.32 * * * * * * * * * * * * * * * 0.67 * * * * * * * * * * * * * * * * * * * * * * * * * 1.38 * * * * * * * * * 0.32 * * * * * * * * 0.56 * 0.70 * * * * * * * * * * * * * * * * * * * * * 2.37 * * * * * * * * * * * * * * * * * * * * 0.41 * * * * * * * * 0.89 * * * * * * -3.78

18

19

20

21

22

23

24

25

26

27

28

29 Errata for GeoPT19 - An international proficiency test for geochemical laboratories Report on Round 19 / July 2006 (Gabbro, MGR-N) Table 1 GeoPT19 Analytical results submitted (June 2006) Table 3 GeoPT19 Z-scores for analytical results submitted Gabbro MGR-N Gabbro MGR-N (June 2006) Round identifier T74 (our error) T75 (our error) T49submitted T49revised Labcode T74 (our error) T75 (our error) T49submitted T49revised Sample MGR-N MGR-N MGR-N MGR-N Sample MGR-N MGR-N MGR-N MGR-N Data quality Quality SiO 2 % m/m TiO 2 % m/m SiO Al 2 O 3 % m/m TiO Fe 2 O 3 % m/m Al 2 O Fe(II)O % m/m Fe 2 O MnO % m/m MnO MgO % m/m MgO CaO % m/m CaO Na 2 O % m/m Na 2 O K 2 O % m/m P 2 O 5 % m/m As * * * * H 2 O + % m/m Ba * 1.24 * * CO 2 % m/m Be * * * * LOI % m/m Cd * * * * Ce * * * * Ag Co * As Cr * Au Cs * * * * B Cu * Ba Dy * * * * Be Er * * * * Bi Eu * * * * Br Ga * * * * Cd Gd * * * * Ce Hf * * * * Cl Ho * * * * Co La * * * * Cr Li * * * * Cs Lu * * * * Cu Nd * * * * Dy Ni * Er Pb * * Eu Pr * * * * F Sb * * * * Ga Sc * * * * Gd Sm * * * * Ge Sr * * Hf Tb * * * * Hg Tm * * * * Ho U * * * * I V * * In W * * * * Ir Y * * La Yb * * * * Li Zn * * Lu Zr * * Mo N Nb Nd Ni Os Pb Pd Pr Pt Rb Re Rh Ru S Sb Sc Se Sm Sn Sr Ta Tb Te Th Tl Tm U V W Y Yb Zn Zr

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