Round robin tests XRF-analysis XRF Round-robin test GeoPT 40A, England - ShTX-1, Calcearous organic-rich shale
Study organized by:
International Association of Geoanalysts and Geostandards Newsletter - GeoPT40A
Material of proficiency test:
ShTX-1, Calcearous organic-rich shale
Study finished:
2017 - 2
Literature:
Report - GeoPT40A Proficiency Testing Round 40A (Laborcode CRB = X25)
major elements [wt %]
| CRB | RV | 1sRV | Z-Score | |
| MgO | 0,550 | 0,420 | 0,010 | 6,730 |
| Al₂O₃ | 3,960 | 4,000 | 0,065 | -0,310 |
| SiO₂ | 25,000 | 25,130 | 0,309 | -0,210 |
| P₂O5 | 0,099 | 0,099 | 0,003 | 0,000 |
| K₂O | 0,330 | 0,337 | 0,008 | -0,440 |
| CaO | 33,050 | 32,950 | 0,389 | 0,130 |
| TiO₂ | 0,180 | 0,175 | 0,005 | 0,530 |
| Fe₂O₃tot | 1,620 | 1,612 | 0,030 | 0,130 |
| MnO | 0,013 | 0,011 | 0,001 | 1,940 |
| L.O.I. | 31,540 | 31,610 | 0,380 | -0,110 |
| TC | 11,920 | 11,910 | 0,164 | 0,030 |
| TOC* | 5,330 | 4,950 | 0,580 |
trace elements [µg/g]
| CRB | RV | 1sRV | Z-Score | |
| As | 15,00 | 15,10 | 0,80 | 0,03 |
| Ba | 59,00 | 73,00 | 3,10 | -2,28 |
| Ce | 31,00 | 24,80 | 1,20 | 2,56 |
| Cl * | 130,00 | 94,00 | 41,00 | |
| Cr | 25,00 | 29,70 | 1,40 | -1,63 |
| Cu | 33,00 | 33,80 | 1,60 | -0,26 |
| F * | 550,00 | 606,00 | 162,00 | |
| Ga | 8,00 | 6,30 | 0,40 | 2,26 |
| Hf | 2,00 | 1,18 | 0,10 | 4,45 |
| Nd | 11,00 | 11,00 | 0,60 | 0,00 |
| Ni | 72,00 | 74,90 | 3,10 | -0,47 |
| Pb | 10,00 | 6,10 | 0,40 | 5,35 |
| Rb | 12,00 | 16,90 | 0,90 | -2,77 |
| Sr | 1042,00 | 1017,00 | 28,70 | 0,44 |
| V | 421,00 | 419,00 | 13,50 | 0,07 |
| Y | 10,00 | 9,60 | 0,50 | 0,37 |
| Zn | 97,00 | 97,80 | 3,90 | -0,10 |
| Zr | 61,00 | 52,60 | 2,30 | 1,82 |
Legend
CRB
results CRB
cooperative test
results collaborative study
1s-RV
Standard deviation collaborative study
Z-Score
Difference of measured value from mean study
*
Value not certified
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