Effects of Preservation Agents on Determinations of VOCs and HAAs in Drinking Water
This research was performed to evaluate effects of inhibition/preservation agents on determinations of chlorinated volatile organic compounds (VOCs) and haloacetic acids (HAAs) in drinking water. Three typical preservation agents: ascorbic acid (25 mg/40 ml); NaHSO4 (25 mg/40 ml); HCl (4 drops 1 N HCl/ 40 ml sample) were introduced. Among them, ascorbic acid was capable of recovering VOCs species within three days of preservation, and proved to be the best preservation agent for VOCs determined over the 60 day holding study. Another holding study was conducted to test the effects of three preservation techniques: Na2SO3 (100 mg/L), Na2SO3 (700 mg/L), and NH4C1 (1.5 g/L) on determinations of HAAs in water samples. After 70 a day holding study, the stability of HAAs under various preservation techniques was in the sequence of: NH4Cl 1.5 g/L> Na2SO3 700 mg/L> Na2SO3 100 mg/L.
KeywordsAscorbic Acid Carbon Tetrachloride Preservation Technique Relative Error Percentage Haloacetic Acid
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