Table 2

The intra-day and inter-day precision and accuracy data for ETD obtained by the proposed methods (A – C).


Intra-day
 Inter-day


Method
 Added (μg mL-1)
 Found ± SE a, b (μg mL-1)
 Precision RSD %
 Accuracy R.M.E %
 Founda, b (μg mL-1)
 Precision RSD %
 Accuracy R.M.E %
A
 1
 0.99 ± 0.45
 1.11
 -1.00
 1.01 ± 0.20
 1.49
 1.00

3
 3.02 ± 0.49
 1.20
 0.67
 2.97 ± 0.37
 0.91
 -1.00

5
 4.99 ± 0.26
 0.64
 -0.20
 4.94 ± 0.31
 0.77
 -1.20

7
 6.97 ± 0.24
 0.59
 -0.43
 6.94 ± 0.34
 0.85
 -0.86








B
 2
 2.02 ± 0.55
 1.34
 1.00
 2.01 ± 0.63
 1.54
 0.50

4
 3.97 ± 0.31
 0.76
 -0.75
 3.99 ± 0.46
 1.13
 -0.25

6
 5.93 ± 0.29
 0.71
 -1.17
 5.96 ± 0.43
 1.06
 -0.67

8
 8.05 ± 0.36
 0.88
 0.625
 7.97 ± 0.38
 0.93
 -0.38








C
 4
 3.98 ± 0.18
 0.45
 -0.50
 4.01 ± 0.46
 1.12
 -0.50

8
 7.95 ± 0.20
 0.50
 -0.625
 8.03 ± 0.40
 0.98
 0.38

12
 11.94 ± 0.33
 0.82
 -0.50
 12.04 ± 0.48
 1.16
 0.33

16
 16.02 ± 0.49
 1.19
 0.125
 15.91 ± 0.54
 1.32
 -0.56

a Average of six determinations.

b Mean ± standard error.

RSD%, percentage relative standard deviation;

R.M.E %, percentage relative mean error.

Gouda and Hassan Chemistry Central Journal 2008 2:7   doi:10.1186/1752-153X-2-7