Certified substance

Mercury (µg∙mL⁻¹), n = 3

Copper (µg∙mL⁻¹), n = 3

Cert. values

Expt. Values

RSD (%)

R (%)

Cert. values

Expt. values

RSD (%)

R (%)

Alloy

6.20

6.17 ± 0.03

0.49

99.10

Amalgam

4.10

4.07 ± 0.02

0.49

99.30

6.00

6.06 ± 0.02

0.33

100.90

[Cu(en)₂]

[Hg(SCN)₄]

2.00

2.04 ± 0.01

0.49

102.30

4.00

3.88 ± 0.01

0.26

97.10

Synthetic mixtures Ions

Conc. of Mercury (μg mL⁻¹)

Exp. Conc. (μg mL⁻¹)

% Er

RSD (%) n = 3

Hg²⁺

3.00

2.95 ± 0.05

−2.96

1.70

Hg²⁺ + Ag⁺ + citrate

2.87 ± 0.03

−5.83

1.10

Hg²⁺ + Ag⁺ + K⁺ + citrate

2.96 ± 0.02

−2.62

0.68

Hg²⁺ + Ag⁺ + K⁺ +Sr²⁺ + citrate

2.85 ± 0.04

−5.47

1.40

Hg²⁺ + Ag⁺ + K⁺ + Sr²⁺ + Al³⁺ + citrate

3.12 ± 0.01

+3.31

0.19

Hg²⁺ + Ag⁺ + K⁺ + Sr²⁺ + Al³⁺ + Mg²⁺+ citrate

3.02 ± 0.01

+1.12

0.17