Search

This article explores the differences between the vulnerability of two ethnic minorities faced with the same environmental disaster, along with the causes of those disparities. Set in the context of the degradation of Lake Urmia in north-western Iran, the study problematizes the unequal access to political power of the Kurdish and Azeri minorities and the historical dynamics of marginalization and empowerment. It links those dynamics with the current differential vulnerability of the members of the two minorities living in proximity of the lake, who have traditionally been dependent on agriculture as a means of subsistence. The degradation of the lake has severely affected the agricultural production in the region through the salinization of irrigation water and the degradation of arable land. The study focuses on households in the proximity of the lake with the goal of exploring to what extent their ethnicity determines their vulnerability and adaptive capacity in the face of the disaster. We find that ethnic politics plays a role in the access to irrigation water and the potential for income diversification, as well as being a component of the coping capacity embedded in social networks. Additionally, we find that ethnicity is a determinant of the availability of economic resources, and strongly influences the knowledge of – and willingness to participate in – governmental and non-governmental projects to mitigate the effects of the environmental disaster. Key words: vulnerability, ethnicity, Iran, political power, minorities, environmental degradation, Lake Urmia

Background Benzalkonium chloride (BAC) is one of the most common ingredients of the disinfectants. It is commonly detected in surface and wastewaters where it can interact with the residues of pharmaceuticals that are also common wastewater pollutants. Among the latter, the residues of antineoplastic drugs are of particular concern as recent studies showed that they can induce adverse effect in aquatic organisms at environmentally relevant concentrations. Methods Ecotoxicity of BAC as an individual compound and in a binary mixture with an antineoplastic drug 5-fluorouracil (5-FU) was determined towards alga Pseudokirchneriella subcapitata, a representative of primary producers. The toxicity of the BAC+5-FU binary mixture was predicted by the two basic models: concentration addition (CA) and independent action (IA), and compared to the experimentally determined toxicity. Additionally combination index (CI) was calculated to determine the type of interaction. Results After 72 h exposure to BAC a concentration dependent growth inhibition of P. subcapitata was observed with an EC50 0.255 mg/L. Comparing the predicted no effect concentration to the measured concentrations in the surface waters indicate that BAC at current applications and occurrence in aquatic environment may affect algal populations. The measured toxicity of the mixture was higher from the predicted and calculated CI confirmed synergistic effect on the inhibition of algal growth, at least at EC50 concentration. The observed synergism may have impact on the overall toxicity of wastewaters, whereas it is less likely for general environments because the concentrations of 5-FU are several orders of magnitude lower from its predicted no effect concentration. Discussion These results indicate that combined effects of mixtures of disinfectants and antineoplastic drugs should be considered in particular when dealing with environmental risk assessment as well as the management of municipal and hospital wastewaters.