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281.
Effects of sulfonamide and tetracycline antibiotics on soil microbial activity and microbial biomass 总被引:32,自引:0,他引:32
Increasingly often soil residual concentrations of pharmaceutical antibiotics are detected, while their ecotoxic relevance is scarcely known. Thus, dose related effects of two antibiotics, sulfapyridine and oxytetracycline, on microorganisms of two different topsoils were investigated. The fumigation-extracted microbial C (E(C)) and ergosterol were determined to indicate soil microbial and fungal biomass, respectively. Microbial activity was tested as basal respiration (BR), dehydrogenase activity (DHA), substrate-induced respiration (SIR), and Fe(III) reduction. The BR and DHA were uninfluenced even at antibiotic concentrations of 1000 microg g(-1). This revealed that an activation of microbial growth through nutrient substrate addition is required to test possible effects of the bacteriostatic antibiotics. In addition, the effects of both antibiotics were time dependent, showing that short-term tests were not suitable. Clear dose-response relations were determined with SIR when the short-term incubation of 4h was extended into the growth phase of the microorganisms (24 and 48 h). The Fe(III) reduction test, with a 7-d incubation, was also found to be suitable for toxicity testing of antibiotics in soils. Effective doses inhibiting the microbial activity by 10% (ED(10)) ranged from total antibiotic concentrations of 0.003-7.35 microg g(-1), depending on the antibiotic compound and its soil adsorption. Effective solution concentrations (EC(10)), calculated from distribution coefficients, ranged from 0.2 to 160 ng g(-1). The antibiotics significantly (p<0.05) reduced numbers of soil bacteria, resulting in dose related shifts in the fungal:bacterial ratio, which increased during 14 d, as determined from analysis of ergosterol and E(C). It was concluded that pharmaceutical antibiotics can exert a temporary selective pressure on soil microorganisms even at environmentally relevant concentrations. 相似文献
282.
Jurikova Martina Dvorakova Darina Pulkrabova Jana 《Environmental science and pollution research international》2022,29(40):60341-60353
Environmental Science and Pollution Research - Drinking water is one of the main contributors to overall human exposure to per- and polyfluoroalkyl substances (PFAS), a broad group of environmental... 相似文献
283.
Picone Marco Distefano Gabriele Giuseppe Marchetto Davide Russo Martina Volpi Ghirardini Annamaria 《Environmental science and pollution research international》2022,29(21):31002-31024
Environmental Science and Pollution Research - Laboratory testing with spiked sediments with organic contaminants is a valuable tool for ecotoxicologists to study specific processes such as effects... 相似文献
284.
Guglielmi Vittoria Andreoli Martina Comite Valeria Baroni Anna Fermo Paola 《Environmental science and pollution research international》2022,29(20):29419-29437
Environmental Science and Pollution Research - The aim of this work has been the identification of the painter’s materials employed in the wall decoration of some destroyed buildings dating... 相似文献
285.
Toman Robert Psenkova Martina Tancin Vladimir Miskeje Michal 《Environmental science and pollution research international》2022,29(41):62259-62271
Environmental Science and Pollution Research - The aim of this work was to determine the concentrations of selected mutagenic elements (As, Cd, Co, Cr, Cu, Fe, Mn, Ni, Pb, and Se) in raw ewe milk... 相似文献