Iodoform

Reaction solution for both UV direct photolysis and UV/H2O2 advanced oxidation were prepared using deionized (DI) water (Millipore, USA). Dichloroiodomethane (CHCl2I, 95+%) was purchased from Cansyn Chemical Corp (Canada). Iodoform (CHI3, 99%) and p-xylene were purchased from Sigma-Aldrich (Singapore). H2O2 (35% w/w aqueous solution) was purchased from Alfa Aesar (Singapore).

All reagents used were of highest purity, iodoform (CHI 3 ), 1,2 dibromopropane (used as internal standard SI) and THMs mixture 100 µg/µL of each compound: chloroform (CHCl 3 ), bromodicloromethane (CHBrCl 2 ), dibromochloromethane (CHBr 2 Cl), and bromoform (CHBr 3 ), were purchased from Sigma-Aldrich (Steinhein Germany). Iodo-trihalomethanes (I-THMs): bromodiiodomethane (CHBrI 2 90%), bromochloroiodomethane (CHBrClI 95%), chlorodiiodomethane (CHClI 2 95%), dibromoiodomethane (CHBr 2 I 95%) and dichloroiodomethane (CHCl 2 I 95%) were purchased from Orchid Cellmark (New Westminster, BC, Canada). Methanol, n-hexane, toluene, acetonitrile and acetone were purchased from Teknokroma (Barcelona, Spain). n-Octanol was supplied from Merck (Barcelona, Spain). Accurel Q 3/2 polypropylene hollow fiber membranes with an inner diameter of 600 µm, 200 µm of wall thickness and 0.2 µm pore size was obtained from Wuppertal (Germany). Ultrapure water (18MΩ cm) was obtained from a Milli-Q water-purification system (Millipore, Watford, UK) and was used for spiked samples and blanks preparation. to achieve a final concentration of 5 µg L -1 .