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

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)