Element

Concentration of metal added (spiked) (mg/g)

Concentration of metal in the original sample (unspiked) (mg/g)

Concentration of metal in the spiked sample (mg/g)

Recovered concentrations (mg/g)

% Recovery

Pb

Mean ± SD

1

1

1

0.430

0.432

0.426

1.428

1.432

1.420

0.998

1.000

0.994

99.8

100

99.4

99.73 ± 2.177

As

Mean ± SD

1

1

1

0.331

0.326

0.329

1.231

1.216

1.360

0.900

0.890

1.031

90

89

103.1

103.1 ± 7.87

Cd

Mean ± SD

1

1

1

0.586

0.604

0.589

1.591

1.584

1.609

1.005

0.980

1.020

100.5

98

102

100.17 ± 2.02

Cr

Mean ± SD

1

1

1

0.312

0.309

0.310

1.312

1.289

1.348

1.000

0.980

1.038

100

98

103.8

100.6 ± 2.95

Hg

Mean ± SD

2

2

2

0.374

0.403

0.385

2.174

2.533

2.085

1.800

2.130

1.700

90

106.5

85

93.83 ± 11.25

Ni

Mean ± SD

2

2

2

0.019

0.015

0.019

2.019

1.995

1.986

2.000

1.980

1.967

100

99

98.4

99.13 ± 0.808

V

Mean ± SD

2

2

2

0.063

0.057

0.069

1.967

1.850

2.094

1.904

1.793

2.025

95.20

89.65

101.25

95.4 ± 5.803

Cu

Mean ± SD

2

2

2

0.134

0.133

0.130

2.185

1.958

2.234

2.051

1.825

2.104

102.55

91.25

105.20

99.7 ± 7.39