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Table T7. Handheld X-ray fluorescence measurements of BCR-2 standard by using rock standard calibration, Expedition 345.
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Preferred
value*
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Expedition 335
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Expedition 345
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Calibration
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Accuracy
(%)
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Calibration
(N = 5)
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Precision
(%)
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Accuracy
(%)
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Major element (wt%):
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SiO2
|
54.1
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48.14
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–11.02
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52.61
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1.52
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–2.75
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TiO2
|
2.26
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1.77
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–21.62
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2.27
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0.92
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0.38
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Al2O3
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13.5
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8.9
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–34.07
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9.4
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6.2
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–30.37
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FeOT
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12.28
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12.41
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1.07
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12.10
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0.18
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–1.48
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MnO
|
0.2
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0.22
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8.86
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0.19
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1.21
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–5.88
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MgO
|
3.59
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BDL
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—
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BDL
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—
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—
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CaO
|
7.12
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7.03
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–1.33
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6.77
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0.87
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–4.92
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Na2O
|
3.16
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—
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—
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—
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—
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—
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K2O
|
1.79
|
1.12
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–37.43
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0.97
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3.08
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–45.81
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P2O5
|
0.35
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BDL
|
—
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BDL
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—
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—
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Total:
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98.35
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Trace element (ppm):
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Ba
|
677
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BDL
|
—
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BDL
|
—
|
—
|
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Sr
|
340
|
240
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–29.41
|
353
|
2.98
|
3.82
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Zr
|
184
|
151
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–17.80
|
178
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3.44
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–3.26
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V
|
416
|
150
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–63.94
|
535
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7.49
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28.61
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Cr
|
18
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BDL
|
—
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BDL
|
—
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—
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Co
|
37
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BDL
|
—
|
BDL
|
—
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—
|
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Ni
|
18
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BDL
|
—
|
BDL
|
—
|
—
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Cu
|
21
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BDL
|
—
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BDL
|
—
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—
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Zn
|
127
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105
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–17.32
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109
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4.43
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–14.17
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* = compilation data from Govindaraju (1994) and GeoReM (georem.mpch-mainz.gwdg.de; 31 December 2012). A spreadsheet from Expedition 335 was also used as another quality control to check measurements. N = number of analyses. FeOT = all Fe as FeO. BDL = below detection limit, — = not applicable.
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