Table T5. X-ray fluorescence trace element analytical accuracy and precision.


 Date
(Dec 1999)		 Trace element
(ppm)
Run Nb Zr Y Sr Rb Zn Cu Ni Cr V Ce Ba
BIR-1












Recommended value* 1 16 16 108 0 71 126 166 382 313 2 7
2 5 2 19 16 108 0 72 126 162 420 306 2 80
3 6 3 18 17 108 1 73 125 159 427 306 4 79
4 7 4 19 17 108 0 72 124 159 432 315 6 78
5 10 3 19 17 108 0 72 125 160 432 315 5 78
6 11 4 19 17 108 0 71 124 157 429 312 6 77
7 13 3 19 17 108 0 71 124 161 395 313 7 4
8 16 4 19 17 108 0 72 125 157 351 257 7 24

Average: 3 19 17 108 0 72 125 159 412 303 5 60

1 SD: 1 0 0 0 0 1 1 2 30 21 2 32

%RSD: 23 2 2 0 143 1 1 1 7 7 30 53
MRG-1












Recommended value* 20 108 14 266 9 191 134 193 430 526 26 61
2 5 19 99 14 255 6 189 126 177 525 528 32 47
3 6 21 99 14 254 6 188 126 179 518 510 32 46
4 7 21 100 14 254 7 188 125 178 525 514 33 45
5 10 21 100 14 254 7 186 126 178 525 512 32 46
6 11 22 99 13 254 6 185 126 176 519 489 30 52
7 13 20 98 14 255 7 186 126 180 437 497 32 54
8 16 20 99 14 254 6 185 126 177 444 558 30 60

Average: 21 99 14 254 6 187 126 178 499 515 32 50

1 SD: 1 1 1 1 0 1 0 1 40 23 1 6

%RSD: 4 1 4 0 7 1 0 1 8 4 4 12

Notes: Precision has been estimated from means (in parts per million, except for TiO2) and from standard deviations (SD) of repeated analyses of the reference standards BIR-1 and MRG-1 following the final calibration. * = Govindaraju (1994). RSD = relative standard deviation. This table is also available in ASCII format.