The 11 most frequently detected compounds - all found at extremely low concentrations - were:
• Atenolol, a beta-blocker used to treat cardiovascular disease
• Atrazine, an organic herbicide banned in the European Union, but still used in the US, which has been implicated in the decline of fish stocks and in changes in animal behaviour
• Carbamazepine, a mood-stabilising drug used to treat bipolar disorder, amongst other things
• Estrone, an oestrogen hormone secreted by the ovaries and blamed for causing gender-bending changes in fish
• Gemfibrozil, an anti-cholesterol drug
• Meprobamate, a tranquiliser widely used in psychiatric treatment
• Naproxen, a painkiller and anti-inflammatory linked to increases in asthma incidence
• Phenytoin, an anticonvulsant that has been used to treat epilepsy
• Sulfamethoxazole, an antibiotic used against the Streptococcus bacteria, which is responsible for tonsillitis and other diseases
• TCEP, a reducing agent used in molecular biology
• Trimethoprim, another antibiotic
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