TY - JOUR
T1 - Effect of preozonation on mutagenic activity generated by chlorination of humic acid dissolved in water
AU - Aso, S.
AU - Hayashi, J.
AU - Kusakabe, K.
AU - Morooka, S.
AU - Sera, N.
AU - Horikawa, K.
AU - Tokiwa, H.
PY - 1992/1/1
Y1 - 1992/1/1
N2 - Aqueous solution containing a humic acid was treated by ozonation, which was followed by chlorination with HClO. The TOC level in preozonated samples was varied by changing ozone dosage. When 50% of the TOC was removed,the THMFP and TOX were destructed to ca. 1/30 and 1/20 of the respective initial values. The effect of preozonation on the mutagenic activity of nonvolatile organic chlorides generated by the chlorination was evaluated by the Ames test after the solute was separated on the basis of affinity for hydrophobic XAD-2 adsorbent and fractionation with various solvents. The overall mutagenic activity, defined as the number of revertants per unit volume of the solution considered, was expressed by the product of the following factors: concentration of nonvolatile matter in solution, mass fraction of hydrophobic component in the nonvolatiles, and number of revertants per mg of dosed hydrophobic component. The contribution of each factor was evaluated experimentally. Preozonation was effective for the selective destruction of precursors of the hydrophobic component.
AB - Aqueous solution containing a humic acid was treated by ozonation, which was followed by chlorination with HClO. The TOC level in preozonated samples was varied by changing ozone dosage. When 50% of the TOC was removed,the THMFP and TOX were destructed to ca. 1/30 and 1/20 of the respective initial values. The effect of preozonation on the mutagenic activity of nonvolatile organic chlorides generated by the chlorination was evaluated by the Ames test after the solute was separated on the basis of affinity for hydrophobic XAD-2 adsorbent and fractionation with various solvents. The overall mutagenic activity, defined as the number of revertants per unit volume of the solution considered, was expressed by the product of the following factors: concentration of nonvolatile matter in solution, mass fraction of hydrophobic component in the nonvolatiles, and number of revertants per mg of dosed hydrophobic component. The contribution of each factor was evaluated experimentally. Preozonation was effective for the selective destruction of precursors of the hydrophobic component.
UR - http://www.scopus.com/inward/record.url?scp=0026976027&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0026976027&partnerID=8YFLogxK
U2 - 10.2166/wst.1992.0313
DO - 10.2166/wst.1992.0313
M3 - Article
AN - SCOPUS:0026976027
VL - 26
SP - 355
EP - 362
JO - Water Science and Technology
JF - Water Science and Technology
SN - 0273-1223
IS - 12
ER -