Sample

Initially present (g∙mL⁻¹)

Added (g∙mL⁻¹)

Found (g∙mL⁻¹)

Recovery (%)

1

0.99 × 10⁻⁸

2.0 × 10⁻⁸

3.0 × 10⁻⁸

2.93 × 10⁻⁸

3.96 × 10⁻⁸

98.0

99.2

2

1.46 × 10⁻⁸

1.0 × 10⁻⁸

3.0 × 10⁻⁸

2.42 × 10⁻⁸

4.48 × 10⁻⁸

98.4

100.4

3

2.03 × 10⁻⁸

2.0 × 10⁻⁸

3.0 × 10⁻⁸

4.07 × 10⁻⁸

4.97 × 10⁻⁸

101.0

98.8

4

2.49 × 10⁻⁸

1.0 × 10⁻⁸

2.0 × 10⁻⁸

3.46 × 10⁻⁸

4.55 × 10⁻⁸

99.1

101.3

5

3.03 × 10⁻⁸

1.0 × 10⁻⁸

2.0 × 10⁻⁸

4.11 × 10⁻⁸

4.93 × 10⁻⁸

102.0

98.0