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Table 2 Analytical results of lead in different biological standards heated at 400°C for 1 h

From: Determination of traces of molybdenum and lead in foods by x-ray fluorescence spectrometry

Reference Material Concentration in mg/kg Accuracy (%)
  Measured value (N = 5) Certified value  
Animal bone 3.20 (±0.50) 3.10 (±0.60) 3.2
Orchard leaves 43.0 (±4.00) 45.0 (±3.00) 4.4
Pine needles 11.50 (±0.70) 10.80 (±0.50) 6.5
Lobster 0.31 (±0.15) 0.35 (±0.13) 11.4
hepatopancreas Tomato leaves 5.80 (±0.30) 6.30 (±0.30) 7.9
  1. N = Number of measurements. Uncertainties are counting statistics. Accuracy = Mean value Certified value Certified value × 100 .