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Thousands different chemicals are discharged into the environment from agriculture, industry, medical facilities, house-holds. Currently, there is an increasing concern for the environmental impact of mixture of compounds since the additive and eventual synergistic effects are unknown and could produce serious adverse effects. Recently, a document from the European Commission on combination effects of chemicals highlighted the need to ensure that risks associated with chemical mixtures are properly understood and assessed. To address this issue, a joint-effort of 16 European and associated research groups participated to an exercise to test a synthetic reference chemical mixture on the own routine bioassays to investigate the chemical mixtures effects. The reference material included class of pesticides, pharmaceuticals, industrial products, heavy metals and polyaromatic hydrocarbons. The mixures were prepared, each compound at Equivalent Quality Standard (EQS) value, the safety limit concentration allowed by the European Water Framework Directive, (WFD).The bioassays proposed by the groups could cover the entire ecosystem from bacteria to fish as well in vitro assays providing an unique scenario from ecological risk assessment perspective. The results showed that effects were observed at very low concentration on algal-bacteria composition in a marine microcosm, immobilization in crustacean, fish embryo toxicity and frog embryo development. We conclude that some precaution on the chemical mixture assessment should be taken even in case the individual compounds are present at EQS, the safety limit concentration under European legislation.

This report describes work conducted by the European Commission’s Joint Research Centre (JRC) in the context of an Administrative Arrangement between DG Environment and the JRC. This work aimed at the generation, within a limited timeframe, of a large amount of analytical data, with high scientific and statistical value, for a number of compost and digestate types (afterwards referred to as COMDIG samples), to help provide a general overview and estimation of that possible variability within and between different COMDIG materials. The report includes the results of a targeted and independent screening of typical European situations of COMDIG materials with regard to the occurrence and levels of compounds of concern, many of which have never been assessed at a pan-European level. In total, 139 samples, mostly taken as grab samples and originating from 15 countries, were assessed for 22 minor and trace elements and 92 organic compounds including ingredients of personal care products and pharmaceuticals. The underlying analytical methods are carefully documented with regard to their performance characteristics. Where available, the so-called “horizontal” standards were followed. The results obtained are assessed statistically. Although the analysed single samples are insufficient to make any statement on the performance of the treatment processes leading to COMDIG samples, this collective of data provide a glimpse of the pan-European situation as regards the studied compounds., JRC.H.1-Water Resources