Method A Condition Recovery ± RSD*   Method B Condition Recovery  ± RSD*
pH
7.8
8.2

100.61 ± 1.791
99.82 ± 0.902
pH
11.8
12.2
101.62 ± 1.326
102.01 ± 1.762
Temperature (˚C)
35
45

100.92 ± 0.893
103.44 ± 1.308
Temperature (˚C)
20
30
104.83 ± 2.790
102.28 ± 1.968
Time (min)
8
12

98.72 ± 0.456
99.19 ± 0.454
Time (min)
8
12
103.34 ± 1.305
103.37 ± 1.735
ARS concentration (mole/L)
14.8x10-3
15.2x10-3

102.66 ± 1.318
98.09 ± 0.459
ARS concentration (mole/L)
3.8x10-3
4.2x10-3

100.84 ± 1.336
98.49 ± 2.278
*value are mean of three determinations
Table 4: Robustness of the proposed methods.