The solid-phase extraction-derivatization-GC-MS and solid-phase extraction-LC-MS methods, analytical techniques for detecting phenols in tap water, necessitate a large sample volume due to concentration operations. Moreover, the LC-MS method involves the use of an atmospheric pressure chemical ionization (APCI) probe, complicating and inefficient analytical procedures. In this study, we developed a direct injection analysis method employing electrospray ionization (ESI) using phenol derivatization with the reagent DMT-MM. As a result, this method is applicable as an analytical method for phenols in tap water, as it satisfies the criteria described in the Japanese validation guideline regarding calibration curve evaluation and recovery tests.

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Although the introduction of advanced water purification treatment with ozone - granular activated carbon treatment has greatly improved the quality of tap water, new issues have emerged, such as the detection of musty odors during the low water temperature period. Therefore, to enhance the functionality of the water purification system, we investigated the water treatment performance of ozone using ultrafine bubble generation technology. As a result, it was confirmed that ozone treatability is highly correlated with ozone CT value regardless of the injection method. In addition, since the ultrafine bubble method has higher ozone dissolution efficiency and higher OH radical generation efficiency than the diffusion tube method, the amount of ozone required to obtain a certain ozone CT value was relatively small in the experimental system used in this study.

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[in Japanese]

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