Standard Conc. (µg/L)

Intra-day precision

Inter-day precision

Mean observed conc. (µg/L) (n = 6)

% RSD

Days

Analyst

Mean observed conc. (µg/L) (n = 6)

Mean observed conc. (µg/L) (3 days)

% RSD

Mean % RSD

5

5

1.73

Day 1

Analyst-1

4.804

4.92

3.871

2.19

Day 2

Analyst-2

4.95

1.977

Day 3

Analyst-3

5.00

0.716

10

10.55

2.20

Day 1

Analyst-1

9.95

9.87

1.169

2.23

Day 2

Analyst-2

9.80

2.730

Day 3

Analyst-3

9.85

2.779

50

50.65

0.95

Day 1

Analyst-1

49.45

49.73

3.287

1.62

Day 2

Analyst-2

49.7

1.643

Day 3

Analyst-3

50.05

1.984

100

98.25

1.84

Day 1

Analyst-1

99.1

99.43

1.248

2.00

Day 2

Analyst-2

99.2

1.587

Day 3

Analyst-3

100

3.142