Elements

Certified values

MWD

Mean ± SD

(%) Recovery

Paired t-testa

tExperimental

Certified sample of serum (μg/l)

Cd

4.60 ± 1.2

4.56 ± 0.18

(3.95)b

99.1

0.123

Zn

2.225 ± 0.334

2.75 ± 0.16

(5.81)

99.6

0.670

Certified sample of whole blood (μg/l)

Cd

1.2 ± 0.4

1.189 ± 0.10

(8.41)

99.1

0.00636

Zn*

2.27 ± 0.06

2.19 ± 0.15

(6.61)

96.5

0.260

Certified sample of human hair (μg/g)

Cd

0.52 ± 0.024

0.515 ± 0.042

(8.15)

99.04

0.145

Zn

199 ± 5.0

197.8 ± 7.29

(3.68)

99.4

0.678