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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Riu, Josep García, María-Jesús Farré, Marinel Barceló, Damià Castillo, Montserrat |
| Copyright Year | 2001 |
| Abstract | A cost-effective strategy combining chemical analysis and bioassays for the identification of polar toxic compounds in sewage sludge is reported. ToxAlert®100 bioluminescence inhibition assay was used in combination with chemical analysis involving extraction, clean-up, chromatographic separation and mass spectrometry detection. This methodology was applied to real samples of sludge from three wastewater treatment plants (WWTP) located in Catalonia (Spain) during a 3 month period. In the first step, sewage sludge was lyophilized, treated by sonication with a mixture of methanol and chloroform and finally cleaned up using a sequential solid phase extraction (SSPE) with an octadecylsilica cartridge (C18) in series with a polymeric Lichrolut EN cartridge (Lic EN). In the second step, the toxicity of each fraction of the sludge sample was investigated using the ToxAlert®100. The unequivocal identification and quantification of polar organic cytotoxic substances present in the fractionated extracts were determined by liquid chromatography-mass spectrometry (LC-MS). Major toxic compounds identified were: non-ionic polyethoxylated surfactants (nonylphenol polyethoxylates, alcohol polyethoxylates), their intermediates (polyethylene glycol polyethoxylated, nonylphenol carboxylates and polyethoxylated alcohol carboxylates), linear alkylbenzenesulfonates and heavy metals. The toxic response (in terms of bioluminescence inhibition using ToxAlert®100), defined by the 50% effective concentration (EC50), and the toxicity units (TU) for every standard non-ionic surfactant were calculated. The results provided the identification of polar cytotoxic compounds as well as the evaluation of their contribution to the total toxicity observed in sewage sludge. |
| Starting Page | 232 |
| Ending Page | 237 |
| Page Count | 6 |
| File Format | HTM / HTML PDF |
| ISSN | 14640325 |
| Volume Number | 3 |
| Issue Number | 2 |
| Journal | Journal of Environmental Monitoring |
| DOI | 10.1039/b100945l |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Catalonia Spain Sewage sludge Bioluminescence Chromatography Mass spectrometry Wastewater Sonication Methanol Chloroform Solid phase extraction Centerfire ammunition Cytotoxicity Liquid chromatography\u2013mass spectrometry Ethoxylation Polyethylene glycol Sodium dodecylbenzenesulfonate EC50 Surfactant |
| Content Type | Text |
| Resource Type | Article |
| Subject | Public Health, Environmental and Occupational Health Management, Monitoring, Policy and Law |
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