Table 2: (a) Evaluation of accuracy and precision (using ECH as reagent). (b) Evaluation of accuracy and precision (using HPC as reagent).
(a)

Amount taken (μg mL−1)Amount found* (μg mL−1)RE (%)SD (μg mL−1)RSD (%)

2.001.981.000.0150.79
4.003.970.750.02070.52
6.005.960.660.02390.4
8.007.970.370.02590.32
10.009.960.40.02700.27
12.0011.950.410.04040.33

* Mean of five determinations.
(b)

Amount taken (μg mL−1)Amount found* (μg mL−1)RE (%)SD (μg mL−1)RSD (%)

20.0019.990.050.090.45
40.0040.03−0.080.060.14
60.0059.960.060.120.20
80.0079.930.080.080.10

* Mean of five determinations.
RE: relative error; SD: standard deviation; RSD: relative standard deviation.