Suchergebnisse

Abstract
Background
Bisphenol A (BPA) is currently one of the most widely used synthetic chemicals in the production of a wide range of plastics. Due to its diverse endocrine disrupting potential alternative bisphenols, also referred to as analogues, have been developed. Although the toxicity of BPA is well studied, the (eco)toxicological effects of the bisphenol analogues are largely unknown. The similar molecular structure of the analogues suggests comparable toxicological effects. This study aims to extend the (eco)toxicological knowledge on the bisphenol analogues by evaluating eleven bisphenol analogues compared to the reference substance BPA in in vitro bioassays. The examined endpoints are endocrine potential on three nuclear receptors in recombinant yeast cells of Saccharomyces cerevisiae, baseline toxicity (also referred to as non-specific toxicity, describing the minimal toxicity of a chemical) in the luminescent bacterium Aliivibrio fischeri, and mutagenicity in two strains of Salmonella typhimurium.

Results
Bisphenol A showed estrogenic and anti-androgenic activity at EC50 concentrations of 0.516 mg/L (2.26 × 10–6 M) and 1.06 mg/L (4.63 × 10–6 M), respectively. The assays confirmed notable estrogenic and anti-androgenic activity for the vast majority of analogues in comparable, and often higher, efficacies to BPA. Some analogues showed anti-estrogenic instead of estrogenic activity in a range from 0.789 mg/L (1.45 × 10–6 M; TBBPA) to 2.69 mg/L (2.46 × 10–6 M; BADGE). The baseline toxicity of the analogues revealed a similar tendency of comparable to more prominent effects compared to BPA, ranging from 5.81 mg/L (1.73 × 10–5 M; BPAF) to 39.1 mg/L (1.56 × 10–4 M; BPS). There was no evidence of mutagenicity found.

Conclusion
The examined bisphenol analogues prove to be equally, if not more, problematic in endocrine activities than the reference bisphenol A. Based on these results, the tested bisphenols cannot be regarded as safer alternatives and reinforce the notion of bisphenol analogues being considered as regrettable substitutions.

Since the 1980s, advances in wastewater treatment technology have led to considerably improved surface water quality in the urban areas of many high income countries. However, trace concentrations of organic wastewater-associated contaminants may still pose a key environmental hazard impairing the ecological quality of surface waters. To identify key impact factors, we analyzed the effects of a wide range of anthropogenic and environmental variables on the aquatic macroinvertebrate community. We assessed ecological water quality at 26 sampling sites in four urban German lowland river systems with a 0–100% load of state-of-the-art biological activated sludge treated wastewater. The chemical analysis suite comprised 12 organic contaminants (five phosphor organic flame retardants, two musk fragrances, bisphenol A, nonylphenol, octylphenol, diethyltoluamide, terbutryn), 16 polycyclic aromatic hydrocarbons, and 12 heavy metals. Non-metric multidimensional scaling identified organic contaminants that are mainly wastewater-associated (i.e., phosphor organic flame retardants, musk fragrances, and diethyltoluamide) as a major impact variable on macroinvertebrate species composition. The structural degradation of streams was also identified as a significant factor. Multiple linear regression models revealed a significant impact of organic contaminants on invertebrate populations, in particular on Ephemeroptera, Plecoptera, and Trichoptera species. Spearman rank correlation analyses confirmed wastewater-associated organic contaminants as the most significant variable negatively impacting the biodiversity of sensitive macroinvertebrate species. In addition to increased aquatic pollution with organic contaminants, a greater wastewater fraction was accompanied by a slight decrease in oxygen concentration and an increase in salinity. This study highlights the importance of reducing the wastewater-associated impact on surface waters. For aquatic ecosystems in urban areas this would lead to: (i) improvement of the ecological integrity, (ii) reduction of biodiversity loss, and (iii) faster achievement of objectives of legislative requirements, e.g., the European Water Framework Directive.