The statistical study of precision and accuracy of the proposed method was made from F
criterion and the t-test, respectively. The t-test was applied to the results obtained by the proposed and the iodine method, and it showed that calculated t values were lower than the tabulated t value (t = 2.31, P = 0.05). This suggested that at 95 % confidence level differences between the results obtained by the two methods were statistically not significant.