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Table 4 Calibration for the liquid standards: content in standard sample measured with ICP-MS and the calculated value from the µXRF calibration

From: Analysis of trace metal distribution in plants with lab-based microscopic X-ray fluorescence imaging

Standard samples K [mg kg−1] Ca [mg kg−1] Mn [mg kg−1] Fe [mg kg−1] Ni [mg kg−1] Cu [mg kg−1] Zn [mg kg−1]
Std 1
 ICP-MS 195 200 275 279 293 318 327
 µXRF 194 203 274 272 294 315 327
Std 2
 ICP-MS 98 100 137 140 147 159 164
 µXRF 101 86 140 154 146 166 162
Std 3
 ICP-MS 49 50 69 70 73 79 82
 µXRF 47 61 67 62 74 75 82
Std 1
 RSE  % 0.26 0.74 0.18 1.27 0.17 0.47 0.26
Std 2
 RSE  % 1.51 7.53 1.08 4.76 0.34 2.15 1.51
Std 3
 RSE  % 2.08 9.91 1.47 6.06 0.68 2.60 0.00
  1. The relative standard error percentage (SE/mean  %, with n = 2 and SE = STDEV/sqrt(n)) shows the difference between the µXRF result and the ICP-MS