As shown in Fig. 5, a linear relationship was obtained between the color intensity (I) and the logarithm of the concentration of nitrite (I = 47.522 × log [NO2 −] − 39.973, R2 = 0.988).
As shown in Fig. 5, a linear relationship was obtained between the color intensity (I) and the logarithm of the concentrationof nitrite (I = 47.522×log [NO2−]−39.973, R2 = 0.988).