With the increasingly strict environmental protection requirements

TMT-15 is more and more widely used in desulfurization wastewater treatment projects of coal-fired power plants. Based on the characteristics of conjugated acid base and conjugated triazine ring

the determination principle

medium conditions

detection procedure and the accuracy and precision of the method for determining the effective substance Na_3TMT content of TMT-15 and the residual TMT content in water were studied. The result indicates that

according to the acid dissociation constants K_(a1)

K_(a2) and K_(a3) of H_3TMT

using H_2SO_4 as the titrant and setting the pH value of 9.87 and 3.62 as the starting point and the end point of the acid-base titration on the automatic potentiometric titrator

the content of Na_3TMT in the TMT-15 can be determined. Because the conjugated homotriazine ring in Na_3TMT molecule has strong ultraviolet absorption at l=300 nm(e =10~(4.03) L/(mol·cm))

the standard curve of Na_3TMT solution mass concentration(mg/L) against absorbance plotted by using UV-Vis spectrophotometer and 1 cm quartz colorimetric dish in 1 mol/L NaOH solution has good linear correlation

which can be used to determine the residual TMT content in water. The paper gave the method for determining the TMT concentration in aqueous solutions and effluents

helping to accurately accept

add

and evaluate TMT-15 agents.