title: Drugs of abuse, cytostatic drugs and iodinated contrast media in tap water from the Madrid region (central Spain):A case study to analyse their occurrence and human health risk characterization.
abstract: This work analyses the presence of forty-eight emerging pollutants, including twenty-five drugs of abuse and metabolites, seventeen cytostatic drugs and six iodinated contrast media, in tap water from the Madrid Region. Analysis of the target compounds in the tap water was performed by means of (on-line or off-line) solid-phase extraction followed by analysis by liquid chromatography-tandem mass spectrometry. A preliminary human health risk characterization was undertaken for each individual compound and for different groups of compounds with a common mechanism of action found in tap water. The results of the study showed the presence of eight out of the twenty-five drugs of abuse and metabolites analysed, namely, the cocainics cocaine and benzoylecgonine, the amphetamine-type stimulants ephedrine, 3,4-methylenedioxymethamphetamine and methamphetamine, the opioid methadone and its metabolite 2-ethylene-1,5-dimethyl-3,3-diphenylpyrrolidine and, finally caffeine at concentrations ranging from 0.11 to 502 ng L(-1). Four out of the six analysed iodinated contrast media, namely, diatrizoate, iohexol, iomeprol and iopromide, were detected in at least one sample, with concentration values varying between 0.4 and 5 ng L(-1). Cytostatic compounds were not detected in any sample. Caffeine was the substance showing the highest concentrations, up to 502 ng L(-1), mainly in the drinking water sampling point located in Madrid city. Among the other drugs of abuse, the most abundant compounds were cocaine and benzoylecgonine, detected at concentrations ranging from 0.11 to 86 ng L(-1) and from 0.11 to 53 ng L(-1), respectively. Regarding iodinated contrast media, iohexol was the most ubiquitous and abundant compound, with a frequency of detection of 100% and concentrations from 0.5 to 5.0 ng L(-1) in basically the same range in all sampling points. Taking into account the results and types of treatment applied, ozonisation plus granular activated carbon filtration appears to be efficient in the removal of cocaine and benzoylecgonine. For the amphetamine-type stimulants, opioids and caffeine, ozonisation plus granular activated carbon filtration and ultrafiltration plus reverse osmosis showed higher removal efficiency than sand filtration. The human health risk characterization performed indicates that the lifetime consumption of the tap waters analysed has associated a negligible human health concern.
authors.affiliation: Research Group in Environmental Health and Ecotoxicology (ToxAmb), Rey Juan Carlos University, Avda. Tulipán, s/n, 28933 Móstoles, Madrid, Spain; Department of Occupational Health and Safety, University Hospital of Fuenlabrada, Camino del Molino, s/n, 28942 Fuenlabrada, Madrid, Spain. Electronic address: angelesmendoza1970@gmail.com.
authors.forename: A
authors.initials: A
authors.lastname: Mendoza
authors.affiliation: Water and Soil Quality Research Group, Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain.
authors.forename: B
authors.initials: B
authors.lastname: Zonja
authors.affiliation: Water and Soil Quality Research Group, Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain.
authors.forename: N
authors.initials: N
authors.lastname: Mastroianni
authors.affiliation: Water and Soil Quality Research Group, Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain.
authors.forename: N
authors.initials: N
authors.lastname: Negreira
authors.affiliation: Water and Soil Quality Research Group, Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain.
authors.forename: M
authors.initials: M
authors.lastname: López de Alda
authors.affiliation: Water and Soil Quality Research Group, Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain.
authors.forename: S
authors.initials: S
authors.lastname: Pérez
authors.affiliation: Water and Soil Quality Research Group, Department of Environmental Chemistry, Institute of Environmental Assessment and Water Research (IDAEA-CSIC), Jordi Girona 18-26, 08034 Barcelona, Spain; Catalan Institute for Water Research (ICRA), Scientific and Technological Park of the University of Girona, H(2)O Building, Emili Grahit 101, 17003 Girona, Spain.
authors.forename: D
authors.initials: D
authors.lastname: Barceló
authors.affiliation: Department of Medicine and Surgery, Psychology, Preventive Medicine and Public Health, Immunology and Medical Microbiology, Faculty of Health Sciences, Rey Juan Carlos University, Avda. Atenas, s/n, 28922 Alcorcón, Madrid, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Gil
authors.affiliation: Research Group in Environmental Health and Ecotoxicology (ToxAmb), Rey Juan Carlos University, Avda. Tulipán, s/n, 28933 Móstoles, Madrid, Spain; Department of Medicine and Surgery, Psychology, Preventive Medicine and Public Health, Immunology and Medical Microbiology, Faculty of Health Sciences, Rey Juan Carlos University, Avda. Atenas, s/n, 28922 Alcorcón, Madrid, Spain. Electronic address: yolanda.valcarcel@urjc.es.
authors.forename: Y
authors.initials: Y
authors.lastname: Valcárcel
mesh_terms: D002853:Chromatography, Liquid; D003287:Contrast Media / Q000032:analysis*; D054697:Cytostatic Agents / Q000032:analysis*; D060766:Drinking Water / Q000032:analysis* / Q000592:standards; D004784:Environmental Monitoring / Q000379:methods*; D006801:Humans; D013287:Illicit Drugs / Q000032:analysis*; D007463:Iodobenzoates / Q000032:analysis*; D013058:Mass Spectrometry; D011634:Public Health; D018570:Risk Assessment; D052616:Solid Phase Extraction; D013030:Spain; D014874:Water Pollutants, Chemical / Q000032:analysis*; D018508:Water Purification / Q000379:methods
chemical_list: D003287:Contrast Media; D054697:Cytostatic Agents; D060766:Drinking Water; D013287:Illicit Drugs; D007463:Iodobenzoates; D014874:Water Pollutants, Chemical
keywords: Anti-cancer drugs; Drinking water; Human health risk characterization; Illicit drugs; Pharmaceuticals