Serial No.

As(III): As(V)

As, taken

(µgL⁻¹)

As, found

(µgL⁻¹)

Error

(µgL⁻¹)

As(V)

As(III)

As(V)

As(III)

As(V)

As(III)

1

1: 1

10

10

9.98

9.99

0.02

0.01

1

1: 1

10

10

10.00

10.02

0.00

0.02

1

1: 1

10

10

9.97

9.98

0.03

0.02

Mean error: As(V) = ±0.017 As(III) = ±0.017

Standard deviation: As(V) = ±0.012 As(III) = ±0.011

1

1: 5

10

50

9.98

49.70

0.03

0.30

1

1: 5

10

50

9.99

49.80

0.01

0.20

1

1: 5

10

50

9.98

49.80

0.02

0.20

Mean error: As(V) = ±0.017 As(III) = ±0.234

Standard deviation: As(V) = ±0.0015 As(III) = ±0.0018

1

1:10

10

100

9.99

99.8

0.01

0.2

1

1:10

10

100

9.98

99.9

0.02

0.1

1

1:10

10

100

9.97

99.8

0.03

0.2

Mean error: As(V) = ±0.02 As(III) = ±0.17

Standard deviation: As(V) = ±0.0019 As(III) = ±0.0018