Method Slope Intercept Correlation coefficient Working range 1 13,154 12,205 0.9997 3-450 ng C-T 14,797 2,295 0.999 3-500 ng IG 13,572 16,862 0.993 3-500 ng

Table 1: Comparison between the linearity parameters found in the different SA determination methods. 1-iodo-2-naphthol (1), Chloramine-T (C-T) and Iodogen® (IG).