Table 2. UCSC ICPMS Precision and Accuracy, 2004

Table 2a. Accuracy of ICPMS analyses. es are from Eggins et al. (1997)
Sample bir-1 dnc w-2 Sample bhvo-2 bcr-1 agv-2 Sample rgm-1
Element Measured Assumed Measured Assumed Measured Assumed Element Measured Assumed Measured Assumed Measured Assumed Element Measured Assumed
                                 
Sc 43.1 43.8 32.0 31.1 35.9 36.2 Sc 32.0 31.8 31.9 33 12.7 12 Sc 4.42 4.7
V 317 322 161 157 264 270 V 317 321 405 401 119 120 V 5.14 12
Cr 406 412 287 291 89.6 92 Cr 288 289 10.1 9 15.8 17 Cr 5.80 4.9
Co 52.7 53 62 57 44.9 46 Co 45.7 45 36.9 39 16.3 16 Co 2.09 2.1
Ni 166 166 250 256 70.1 70 Ni 115 120 12.7 12 21.0 19 Ni 5.35 3.7
Rb 0.57 0.2 3.6 3.6 19.3 20.1 Rb 9.77 9.5 46.7 48 67.7 68 Rb 148 155
Sr 107 106 143 141 194 192 Sr 396 390 326 326 652 655 Sr 106 102
Y 16.6 16.2 18.7 18 23.0 22.8 Y 28.0 28 37.9 39 20.9 21 Y 24.3 25.1
Zr 14.8 14.5 37.4 36.4 88.5 92 Zr 181 180 196 201 245 244 Zr 234 241
Nb 0.57 0.56 1.61 1.56 7.92 7.76 Nb 15.8 19.5 13.3 13.1 15.4 15 Nb 9.58 9.57
Cs 0.007 0.005 0.213 0.213 0.895 0.916 Cs 0.11 0.1 0.979 0.99 1.17 1.16 Cs 10.2 10.5
Ba 6.52 6.52 111 104 171 171 Ba 133 133 682 687 1134 1140 Ba 836 831
La 0.63 0.6 3.68 3.68 10.5 10.6 La 15.3 15.5 25.2 25.5 37.9 38 La 23.1 23.2
Ce 1.88 1.9 8.04 8.17 22.8 23.1 Ce 37.5 38 53.0 53.3 69.0 68 Ce 45.8 45.9
Pr 0.377 0.378 1.11 1.11 3.00 3.03 Pr 5.39 5.45 6.89 6.88 8.21 8.232 Pr 5.33 5.32
Nd 2.37 2.38 4.91 4.95 12.9 13 Nd 24.6 24.7 28.7 28.8 30.4 30.31 Nd 19.3 19.1
Sm 1.08 1.12 1.41 1.44 3.27 3.31 Sm 6.12 6.17 6.56 6.6 5.51 5.508 Sm 3.96 3.94
Eu 0.515 0.524 0.600 0.592 1.07 1.09 Eu 2.07 2.06 1.95 1.89 1.56 1.54 Eu 0.637 0.547
Gd 1.84 1.85 2.03 2.02 3.60 3.69 Gd 6.32 6.22 6.76 6.69 4.66 4.69 Gd 3.662 3.56
Tb 0.364 0.379 0.393 0.39 0.602 0.622 Tb 0.959 0.95 1.07 1.07 0.640 0.66 Tb 0.599 0.605
Dy 2.54 2.53 2.74 2.71 3.72 3.79 Dy 5.34 5.25 6.33 6.35 3.48 3.55 Dy 3.65 3.6
Ho 0.584 0.585 0.642 0.638 0.783 0.8 Ho 1.01 1 1.32 1.32 0.678 0.69 Ho 0.783 0.769
Er 1.68 1.73 1.92 1.94 2.16 2.26 Er 2.53 2.56 3.61 3.67 1.80 1.86 Er 2.29 2.33
Tm 0.259 0.26 0.296 0.292 0.317 0.321 Tm 0.340 0.33 0.525 0.53 0.260 0.26 Tm 0.370 0.37
Yb 1.65 1.65 1.93 1.92 1.99 2.03 Yb 2.03 1.98 3.35 3.35 1.64 1.65 Yb 2.51 2.47
Lu 0.246 0.247 0.300 0.292 0.294 0.299 Lu 0.278 0.278 0.499 0.5 0.247 0.25 Lu 0.388 0.386
Hf 0.568 0.562 0.970 0.955 2.19 2.3 Hf 4.38 4.3 4.81 4.86 5.07 5 Hf 5.83 5.81
Ta 0.100 0.041 0.108 0.089 0.389 0.48 Ta 0.686 1.2 0.732 0.795 0.996 0.88 Ta 0.435 0.97
Pb 3.01 2.97 6.48 6.47 7.58 7.81 Pb 2.89 2.1 13.5 13.2 13.1 13 Pb 22.3 24.2
Th 0.030 0.03 0.272 0.24 2.10 2.21 Th 1.22 1.26 5.96 6.19 6.16 6.1 Th 14.2 15.1
U 0.010 0.01 0.056 0.055 0.484 0.497 U 0.425 0.42 1.69 1.68 1.89 1.89 U 5.48 5.56
'Assumed' values are from Eggins et al. (1997)except Ni in basalts which are from Kelley et al. (2003) and AGV2 which are from the USGS website.ey et al. (2003), and AGV2
Italics indicate values that differ from the USGS recommended values by more than 5%.
Calculated' are values obtained when run as unknowns

 

Table 2b. ICPMS analytical precision

Element

BW *

BW *

Ar8 **

Ar8 **

Ar1-5-16 ***

    2 StDev (%)   2 StDev (%) %
           
Sc 38.2±7 1.83% 21.7±4 1.77% 0.901%
V     189±4 2.08% 1.85%
Cr     51.3±5 0.94% 0.619%
Co     25.1±5 2.13% 2.02%
Ni     34±1 3.02% 2.54%
Rb 2.40±2 0.83% 10.6±4 3.34% 0.882%
Sr 280±2 0.71% 739±16 2.16% 1.48%
Y 24.2±2 0.83% 15.0±1 0.74% 0.125%
Zr 63.0±9 1.41% 53.5±7 1.22% 2.02%
Nb 2.70±5 1.9% 3.64±8 2.26% 1.40%
Cs 0.032±5 16% 0.244±13 5.17% 2.90%
Ba 114.9±3 0.26% 543±7 1.33% 0.91%
La 4.12±3 0.73% 12.0±2 1.21% 0.18%
Ce 10.38±3 0.29% 23.7±3 1.18% 0.073%
Pr 1.73±1 0.58% 3.11±4 1.17% 1.29%
Nd 8.59±7 0.81% 12.8±2 1.44% 0.722%
Sm 2.60±2 0.77% 2.78±7 2.42% 0.729%
Eu 0.968±1 0.10% 0.963±26 2.67% 1.16%
Gd 2.87±3 1.05% 2.74±5 1.79% 1.99%
Tb 0.55±1 1.8% 0.412±8 2.02% 0.425%
Dy 3.67±4 1.09% 2.44±4 1.68% 2.11%
Ho 0.85±1 1.2% 0.511±9 1.73% 1.21%
Er 2.47±1 0.40% 1.42±3 2.08% 2.50%
Tm 0.379±5 1.32% 0.212±5 2.23% 1.88%
Yb 2.48±3 1.21% 1.39±2 1.41% 0.537%
Lu 0.381±4 1.05% 0.215±6 2.64% 3.76%
Hf 1.57±2 1.27% 1.36±4 3.14% 0.401%
Ta 0.30±5 17% 0.319±13 4.11% 0.806%
Pb 1.24±2 1.61% 2.97±7 2.34% 3.92%
Th 0.230±3 1.30% 1.02±3 2.85% 1.02%
U 0.077±1 1.3% 0.382±14 3.57% 1.38%

*
External error (four different solutions, one drift correction, same calibration,).UCSC in-house
basalt standard. Mean concentration for four different dissolutions analyzed over about one hour
without normalization to a drift monitor. The ± value is two standard deviations on the final digit.
The % column is that value divided by the mean. This reflects maximum error from all sources.

**
External error (one solution, double drift correction, Mean concentration (n= 33) for one
solution during one analytical session lasting about four hours (one tune and calibration) but
without correction for drift in tuning during the session. The ± value is two standard deviations on
the final digit. The % column is that value divided by the mean.

***
External error (one solution, two drift corrections, two calibrations). The percent difference
between two analyses of the same solution during different analytical (different tunings and
calibrations). Results were first normalized at a common value for Ar8 to reduce errors related to
drift in tuning.