| Summary: | 碩士 === 國立海洋大學 === 食品科學系碩士在職專班 === 90 === The objective of this study is to appraise and analyze of haloacetic acids (HAAs) in tap water. Haloacetic acids, which include monochloroacetic acid (MCAA), dichloroacetic acid (DCAA), trichloroacetic acid (TCAA), monobromoacetic acid (MBAA), and dibromoacetic acid (DBAA), are major constituents of so-call disinfection by-products. The five HAAs mentioned above were analyzed by various methods to compare the suitability of the methods. All three methods, USEPA Method 552.1, USEPA Method 552.2, and APHA Method 6251B, tested were able to produce calibration curves for five targeted HAAs with correlation coefficients of 0.995 or higher. The USEPA Method 552.2 consistently provided a better result than that of others’. The ranges of method detection limit for USEPA Method 552.1, USEPA Method 552.2, and APHA Method 6251B are 0.083-1.833 ng/mL, 0.086-0.470 ng/mL, and 0.161-0.827 ng/mL, respectively. This indicates that the HAA concentrations in the tap water are all lower than the limit regulated by the Stage 1 D/DBP Rules. Furthermore, this study attempted to develop a new method for HAAs analysis using fluorescent compound derivation scheme. The method generates HAAs derivatives with 2-aminophenol. After purification, the resulting compounds are chloromethylbenzoxazole, dichloro- methylbenzoxazole, trichloromethylbenzoxazole, bromomethyl- benzoxazole, and dibromomethylbenzoxazole. These derivatives were successfully analyzed with GC/MS. Additionally, the aromatic structure of these compounds should possess a fluorescent characteristic that can be measured by fluorescence related methods. Further research on the utilization of this property for analysis should be warranted.
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