treatment plant of New Zealand with parallel secondary treatment units. The aim was to
investigate the occurrence, removal, and consumption of 13 drugs of abuse (DOAs)
including illicit drugs, alcohol, nicotine, and their metabolites. The filtered samples were
analysed through direct injection on LC-MS/MS. Ethyl sulfate, one of the major metabolites
of alcohol, was detected at the highest concentration (mean= 8300 ng/L) in wastewater …