Re. Rathbun, TRIHALOMETHANE AND NONPURGEABLE TOTAL ORGANIC-HALIDE FORMATION POTENTIALS OF THE MISSISSIPPI RIVER, Archives of environmental contamination and toxicology, 30(2), 1996, pp. 156-162
Trihalomethane and nonpurgeable total organic-halide formation potenti
als were determined for water samples from 12 sites along the Mississi
ppi River from Minneapolis, MN, to New Orleans, LA, for the summer and
fall of 1991 and the spring of 1992. The formation potentials increas
ed with distance upstream, approximately paralleling the increase of t
he dissolved organic-carbon concentration. The pH and the dissolved or
ganic-carbon and free-chlorine concentrations were significant variabl
es in the prediction of the formation potentials. The trihalomethane f
ormation potential increased as the pH increased, whereas the nonpurge
able total organic-halide formation potential decreased. All formation
potentials increased as the dissolved organic-carbon and free-chlorin
e concentrations increased, with the dissolved organic-carbon concentr
ation having a much greater effect.