Element

Certified value ± U (mg/kg)

Obtained value ± SD (mg/kg)

Recovery %

Hg

0.00591 ± 0.00036

0.00526 ± 0.00291^a

89.0

Cd

0.0224 ± 0.0013

0.0223 ± 0.0044^a

99.4

As

0.285 ± 0.014

0.256 ± 0.013

89.4

Cu

2.35 ± 0.16

2.33 ± 0.15

99.2

Fe

7.42 ± 0.44

7.84 ± 1.31

105.7

Mn

19.2 ± 1.8

19.0 ± 0.8

99.0

Mo

1.451 ± 0.048

1.26 ± 0.028

89.8

Se

0.365 ± 0.029

0.383 ± 0.052

105.0

Zn

19.42 ± 0.26

18.49 ± 1.79

95.2

Co

0.0177 ± 0.0005

0.0180 ± 0.0008^a

101.7

Pb

0.008 ± 0.003

0.005 ± 0.002^a

61.0