His and Her Education and Marital Dissolution: Adding a Contextual Dimension.

Educationally hypogamous marriages, where the wife is more educated than the husband, have been expected to be less stable than other educational pairings, in part because they do not conform to social norms. With the reversal of the gender gap in education, such marriages have become more common than in the past. Recent research suggests that this new context might be beneficial for the stability of hypogamous unions compared to other educational pairings.

Innovative development and validation of an HPLC/DAD method for the qualitative and quantitative determination of major cannabinoids in cannabis plant material.

GC is commonly used for the analysis of cannabis samples, e.g. in forensic chemistry.

Can cocaine use be evaluated through analysis of wastewater? A nation-wide approach conducted in Belgium.

Aims: Cocaine is the second most-used illicit drug world-wide and its consumption is increasing significantly, especially in western Europe. Until now, the annual prevalence has been estimated indirectly by means of interviews. A recently introduced and direct nation-wide approach based on measurements of the major urinary excreted metabolite of cocaine, benzoylecgonine, in wastewater is proposed.

Spatial and temporal variations in the occurrence of cocaine and benzoylecgonine in waste- and surface water from Belgium and removal during wastewater treatment.

Estimates of cocaine consumption are currently resulting from population surveys, consumer interviews and crime statistics. A new approach ("sewage epidemiology") based on the analysis of cocaine (COC) and its metabolite, benzoylecgonine (BE), in water samples was applied to 10 river sites and 30 wastewater treatment plants (WWTPs) in Belgium. Each river site was sampled twice, during the summer of 2007 and the winter of 2007-2008, while each WWTP was sampled on a Sunday and a Wednesday, during the summer-autumn of 2007 and the winter of 2007-2008.

Cocaine and metabolites in waste and surface water across Belgium.

Cocaine abuse, a growing social problem, is currently estimated from population surveys, consumer interviews and crime statistics. A new approach based on the analysis of cocaine (COC) and metabolites, benzoylecgonine (BE) and ecgonine methyl ester (EME), in water samples was applied to 28 rivers and 37 waste water treatment plants in Belgium using solid-phase extraction and liquid chromatography coupled to tandem mass spectrometry. While EME was undetectable, COC and BE were detectable with concentrations ranging from <1 to 753 ng/L and <1 to 2258 ng/L, respectively.