Benzophenone-type UV filters (BPs) are emerging contaminants. However, their occurrence and fate in tropical waters remains poorly understood. This study investigated the occurrence and fate of seven BP-type UV filters (i.e., 2,4-dihydroxybenzophenone (BP-1), 2,2’,4,4’-tetrahydroxybenzophenone (BP-2), 2-hydroxy-4-methoxybenzophenone (BP-3), 2,2’-Dihydroxy-4,4’-dimethoxybenzophenone (BP-6), 2,2’-dihydroxy-4-methoxy-benzophenone (BP-8), 4-hydroxybenzophenone (4OH-BP) and 4,4’-dihyroxybenzophenone (4DHB)) were in a tropical urban watershed consisting of five major tributaries that discharge into a well-managed water body. The BPs concentrations were measured in four compartments, i.e., bulk water, suspended solids, pore water and sediments. Further study will evaluate the vertical concentration profile in the aqueous phases and in the solid phases. This will be followed by a preliminary risk assessment.

Occurrence and fate,benzophenone-type UV filters;,Risk assessment