SLOW RELEASE OF ACTIVE CHLORINE AND BROMINE FROM STYRENE DIVINYLBENZENE COPOLYMERS BEARING N,N-DICHLOROSULFONAMIDE, N-CHLORO-N-ALKYLSULFONAMIDE, AND N-BROMO-N-ALKYLSULFONAMIDE FUNCTIONAL-GROUPS - POLYMER-SUPPORTED REAGENTS .6.

Macroporous styrene-divinylbenzene (> 15% divinylbenzene) copolymer (Pol) substituted with N-halosulfonamide groups, Pol-SO2NX2 (1, X = Cl); N-halo-N-alkylsulfonamide groups, Pol-SO2NXR (2a-c, R = Me, Et, 2-Me-1-Pr, X = Cl, Br); or N,N'-alkanediylbis(halosulfonamide) groups, Pol-SO2NX-(CH2)n-NCXSO2-Pol (3a-c, n = 2, 3, 6, X = Cl, Br), release active halogen at concentrations high enough for disinfection of water flowing at 0.1 mL/[(mL of resin).min] or of standing water. Halogen in effluent decreased with the volume of water treated and decreased faster at pH 5.6 than at pH 7.3. Data [ppm Cl2 equivalent in effluent per L of water treated per g of resin (dry, before halogenation)] follow, ppm (L/g): 3a[Cl], pH 6, 2.3 (0.18), 0.26 (3.21), 25.8-degrees-C; 3a[Br], pH 5.6, 3.08 (0.35), 0.33 (5.67), 24.4-degrees-C; 2a[Br], pH 7.3, 2.88 (0.27), 0.34 (14.4). Aqueous bromide ion converts N-chlorinated resins to N-brominated resins in situ. Passing water with 1-5 ppm NaBr through 3b[Cl] resulted in a sustained output of active halogen-0.48 +/- 0.09 ppm from 3.4 to 18.53 L/g. Sodium hypochlorite regenerates the resins.