Phytoplankton toxicity of the antibiotic chlortetracycline and its UV light degradation products

Chemosphere
R X Guo, J Q Chen

Abstract

Two common freshwater phytoplankton species Microcystis aeruginosa and Scenedesmus obliquus were employed as test organisms to investigate the toxic effects of chlortetracycline widely used in human medicine and veterinary as antibiotic. Toxicity assays were performed into two parts: antibiotic toxicity test and antibiotic degraded products toxicity test. In general, chlortetracycline had significantly toxic effect on population growth and chlorophyll-a accumulation of two phytoplankton. Although M. aeruginosa had ability to grow after exposed to chlortetracycline at 0.5 mg L(-1), its photosynthesis function was also disrupted. Compared with the data in two phytoplankton species, the chlorophyceae was more sensitive than the cyanophyceae. The adverse effect on S. obliquus was stronger than that on M. aeruginosa with increasing concentrations. In addition, for M. aeruginosa, regardless of the UV light degradation time, the treated chlortetracycline also had adverse effect on population growth and chlorophyll-a accumulated. The degraded chlortetracycline under any treatment time was more toxic for S. obliquus than chlortetracycline itself excluding under 24 h. However, the correlation between the toxicity and degradation time was...Continue Reading

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Citations

Sep 25, 2012·Environmental Monitoring and Assessment·Mohamad Ali Fulazzaky
Sep 3, 2013·Journal of Hazardous Materials·Soo-Wohn LeeV Rodríguez-González
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Nov 20, 2020·The Science of the Total Environment·Longyao XuGuibin Jiang
Nov 30, 2020·Journal of Hazardous Materials·Xiaying XinBaiyu Zhang

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