Disinfection effectiveness of organic chloramines, investigating the effect of pH

Bactericidal evaluation of N-halamine-functionalized silica nanoparticles based on barbituric acid

“…This reaction could effectively inhibit or even destroy the enzymatic or metabolic cell processes, resulting in the expiration of the microorganisms [8]. Consequently, considerable research efforts have been devoted to fabricate various N-halamine-based antibacterial materials [9][10][11][12]. * Corresponding authors.…”

Identification and quantification of ineffective chlorine by NaAsO 2 selective quenching method during drinking water disinfection

“…During the quenching reaction, some organic chloramines, which have some oxidizing capacity, can be also quenched by the excess NaAsO 2 . For example, chlorinated glycine was prepared (molar ratio of Cl/N = 0.4, pH = 8.0) [15,21] for NaAsO 2 quenching at pH 7.0 in our study and it was found that the chlorinated glycine could be quenched absolutely with only 2 times NaAsO 2 molar concentration (data not shown). The result is also consistent with the study of Amiri et al that chlorinated glycine got some bactericidal ability at pH 6.9 [21].…”

“…For example, chlorinated glycine was prepared (molar ratio of Cl/N = 0.4, pH = 8.0) [15,21] for NaAsO 2 quenching at pH 7.0 in our study and it was found that the chlorinated glycine could be quenched absolutely with only 2 times NaAsO 2 molar concentration (data not shown). The result is also consistent with the study of Amiri et al that chlorinated glycine got some bactericidal ability at pH 6.9 [21]. The remaining part of organic chloramines without oxidizing abilities is the right target we should pay attention to, which we name ''ineffective chlorine'' in this study.…”

“…In the study of Donnermair and Blatchley III [15], the chlorinated proline displayed visually evident reduction in Escherichia coli (E. coli). In another previous study, E. coli inactivation with N-chloroglycine followed a pseudo-first-order kinetic model at pHs 6.0 and 6.9 [21]. For these organic chloramines, their existence is actually useful in disinfection.…”

“…It was reported that some organic chloramines had inactivation abilities under different reaction conditions [15,21]. In the study of Donnermair and Blatchley III [15], the chlorinated proline displayed visually evident reduction in Escherichia coli (E. coli).…”