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Table 2 Concentration of different metals (μg/g) (±SD) in traditional medicine samples (TM 1–TM 5) using different acid digestion methods

From: Comparative study of three digestion methods for elemental analysis in traditional medicine products using atomic absorption spectrometry

Sample ID As Cd Pb Ni Zn Fe
TM 1       
 A 0.25 (±0.02)a 0.25 (±0.004) 4.177 (±0.09) 6.26 (±0.07) 51.7 (±0.1) 219 (±0.7)
 B 0.24 (±0.02) 0.19 (±0.009) 4.16 (0.04) 6.30 (±0.02) 46.9 (±0.3) 154 (±0.7)
 C 0.3 (±0.04) 0.33 (±0.004) 4.66 (±0.02) 7.02 (±0.9) 56.8 (±1.3) 306 (±1.6)
TM 2       
 A 0.25 (±0.03) 0.19 (±0.004) 2.545 (±0.1) 4.54 (±0.05) 37.6 (±0.02) 213 (±1.2)
 B 0.27 (±0.02) 0.15 (±0.02) 2.41 (±0.09) 4.26 (±0.02) 36.2 (±0.01) 100 (±0.7)
 C 0.33 (±0.03) 0.26 (±0.002) 2.95 (±0.01) 4.70 (±0.16) 41.5 (±0.2) 303 (±1.1)
TM 3       
 A 0.29 (±0.04) 0.12 (±0.001) 4.94 (±0.04) 4.60 (±0.01) 11.9 (±0.1) 114 (±0.5)
 B 0.73 (±0.04) 0.11 (±0.001) 4.94 (±0.04) 4.64 (±0.01) 11.4 (±0.1) 93 (±1.9)
 C 1.2 (±0.06) 0.14 (±0.004) 5.39 (±0.05) 4.89 (±0.02) 14.3 (±0.1) 168 (±0.5)
TM 4       
 A 1.2 (±0.06) 0.15 (±0.001) 2.48 (±0.3) 4.40 (±0.1) 20.4 (±0.1) 227 (±2.0)
 B 0.85 (±0.01) 0.12 (±0.001) 2.32 (±0.07) 4.28 (±0.07) 19.5 (±0.3) 198 (±1.7)
 C 1.9 (±0.12) 0.24 (±0.001) 2.93 (±0.03) 4.80 (±0.12) 23.1 (±0.3) 688 (±2)
TM 5       
 A 1.3 (±0.06) 0.18 (±0.03) 1.95 (±0.09) 5.32 (±0.09) 44.2 (±0.3) 108 (±0.1)
 B 0.88 (±0.03) 0.18 (±0.03) 1.88 (±0.10) 5.00 (±0.03) 42.3 (±0.3) 92 (±0.7)
 C 1.6 (±0.01) 0.25 (±0.003) 2.50 (±0.3) 5.80 (±0.29) 52.3 (±1) 127 (±0.5)
  1. TM traditional medicine, A nitric-perchloric acid, B nitric acid, C nitric-hydrochloric acid
  2. aResults presented as the mean of triplicates (±SD)