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Temporal trends of illicit drugs in WWTPs in Valencia, Spain

AutorAndrés-Costa, María Jesús; Masiá, A.; Andreu Pérez, V. ; Picó, Yolanda
Fecha de publicación25-nov-2013
Citación4th SCARCE International Conference (2013)
ResumenThe presence of drugs of abuse in the aquatic environment has been recognized as an important issue forthe ecosystem due their possible negative effect on it (Richardson, 2011). Incomplete removal of these substances during wastewater treatment could be one of the causes of their release in the environment (Zuccato and Castiglioni, 2009). Pollution by illicit drug residues at very low concentrations is generalized in populated areas, with potential risks for human health and the environment (Zuccato, 2008; Castiglioni et al 2007). In addition, back-calculation from the concentration of illicit drug in the influents of wastewater treatment plants (WWTPs) provides an important tool for estimating its local consumption (Daughton 2001).Samples were collected at the WWTPs of Quart-Benager and Pinedo 1 and 11. These plants treat most of the residual water from Valencia city sampling campaigns were in three years, 2011, 2012 and 2013. In March 2011 were collected influent samples f or seven consecutive da y s. In April 2012 were collected influent and effluent samples for fifteen consecutive days and in March 2013 were collected influent and eftluent samples for seven consecutive days. Illicit drugs were extracted using solid phase extraction (SPE) and determined by liquid chromatography tandem mass spectrometry (LC-MS/MS) in positive ionization with an electrospray ionization source (ESI). Compounds were quantified in wastewater and surface water as parent drugs were cocaine (COC), amphetamine (AMP), methamphetamine {MAMP), ecstasy (MDMA) and ketamine (KET). Benzoylecgonine (BE), 6-acethylmorphine (6-MAM), and 11-nor-9-carboxy-delta9-tetrahydrocannabinol (THC-COOH) were the main urinary metabolites for cocaine, heroin and cannabis respectively. The determination of illicit drugs in the influent of the selected WWTP shows that cocaine is the drug present at highest concentrations in the wastewater followed by cannabis and amphetamine in 2011, 2012 and 2013. The temporal variation of the illicit drugs shows little variation from one year to other showing a quite stable consumption in Valencia city, even through there is a clear increase in the cannabis consumption during this last sampling without any clear explanation. The results from the concentration levels quantifying in the influent and the effluent demonstrated that the treatment plants eliminate these compounds in a high percentage, fully comparable to other studies on removal efficiency carried out in other European countries as Belgium, United Kindown, Italy or France.
DescripciónPóster presentado en el congreso 4th SCARCE International Conference, celebrado en Cádiz, España el 25 y 26 de noviembre de 2013
Aparece en las colecciones: (CIDE) Comunicaciones congresos
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