Considering the components of 2,4,6-trinitrotoluene (TNT)-containing water, this paper aims to research the integrated effects of ions on TNT-removal by O-3/H2O2 through the selection Of Co-3(-), HCOO-, Cu2+ and Al3+. In view of TNT-removal rate and its constant, we find that the test with HCO3- or HCOO- or Cu2+ results in lower TNT-removal rate and its constant than control test. Therefore, it may conclude that HCO3 or HCOO- and Cu2+ has a potential to inhibit the efficacy Of O-3/H2O2, and that their inhibitions increase with an order from HCOO-to Cu2+ and to HCO3-. However, Al3+ is an exception, because it has a potential to improve the efficacy. When the two selected ions coexist, HCO3- and HCOO- inhibit the efficacy. The inhibition is greater than that of either one alone, and also greater than their sum, and thus the integrated effect of HCO3 and HCOO- follows the synergistic effect. The inhibition of Cu2+ and HCOO- coexistence also is greater than that either alone, but smaller than their sum, and thus their integrated effect follows the independent effect. The integrated effect of Al3+ and HCOO- follows the addition effect. (c) 2005 Elsevier B.V. All rights reserved.