Journal
ARCHIVES OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
Volume 56, Issue 4, Pages 638-645Publisher
SPRINGER
DOI: 10.1007/s00244-008-9216-4
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Funding
- Earmarked Research Grant [2151/04 M]
- Research Grants Council of Hong Kong
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Twenty amino acids were chlorinated and examined for the formation of trihalomethane (THM) and haloacetic acid (HAA). The amino acids exhibited a high Cl-2 demand (3.4-10 mg Cl-2 mg(-1) C) but low THM formation (< 4.19 mu g mg(-1) C) except for tryptophan and tyrosine (45.8 - 147 mu g mg(-1) C). Large variation in HAA yield occurred among the amino acids (from not detectable to 106 mu g mg(-1) C). One group of amino acids, possessing chain structures, exhibited a slow increase in HAA formation (< 6.2 mu mol mol(-1) amino acid or < 11.3 mu g mg(-1) C) as the chlorine demand increased (3.4-8.9 mol Cl-2 mol(-1) amino acids). The other group of amino acids, containing ring structures (including tryptophan, tyrosine, histidine, phenylalanine, and proline) and two amino acids with chain structures (aspartic acid and asparagine), showed a fast increase in HAA formation (16-96 mu mol mol(-1) amino acid or 27-106 mu g mg(-1) C) with the increase in chlorine demand (5.2-15.9 mol Cl-2 mol(-1) amino acid). The ratios of TCAA to DCAA (mol/mol), derived from the amino acids, ranged between 0.01 and 1.10.
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