flocoumafen and coumatetralyl

The occurrence of 10 commonly used anticoagulant rodenticides in centrifuged sludge of 27 wastewater treatment plants was evaluated using solid-liquid extraction (SLE) and liquid chromatography-tandem mass spectrometry (LC-MS/MS). Activated carbon, alumina, and Florisil cartridges with methanol/dichloromethane as eluting solvents were tested in combination with primary-secondary amine (PSA) to optimize an efficient sample cleanup. PSA in combination with Florisil was the best methodology to extract anticoagulant rodenticides in sludge providing recoveries between 42 ± 0.5 and 100 ± 2 %. Warfarin, bromadiolone, ferulenol, and coumachlor were the most ubiquitous compounds in sludge at concentrations up to 84.2 ng g(-1) for the latter. Coumatetralyl, dicoumarol, and brodifacoum were detected sporadically at levels between 6.1 and 17.4 ng g(-1). On the contrary, acenocoumarol, difenacoum, and flocoumafen were not detected in any sample. Finally, we estimated the amount of anticoagulant rodenticides discharged via sludge in order to determine the potential impact to agricultural soil according to different sludge usage practices in the region investigated. This study demonstrates that anticoagulant rodenticides are accumulated in sludge during activated sludge treatment and that the application of sludge as fertilizers may pose a future environmental risk, if not controlled.

Topics: 4-Hydroxycoumarins; Anticoagulants; Chromatography, High Pressure Liquid; Coumarins; Rodenticides; Sewage; Tandem Mass Spectrometry; Warfarin; Wastewater

Anticoagulants are biocides widely used as pest control agents in agriculture, urban infrastructures, and domestic applications for the control of rodents. Other anticoagulants such as warfarin and acenocoumarol are also used as drugs against thrombosis. After use, anticoagulants are discharged to sewage grids and enter wastewater treatment plants (WWTPs). Our hypothesis is that WWTP effluents can be a source of anticoagulants to receiving waters and that these can affect aquatic organisms and other nontarget species. Therefore, the objective of the present study was to determine the occurrence of 11 anticoagulants in WWTPs receiving urban and agricultural wastewaters. Warfarin was the most ubiquitous compound detected in influent waters and was partially eliminated during the activated sludge treatment, and low nanograms per liter concentration were found in the effluents. Other detected compounds were coumatetralyl, ferulenol, acenocoumarol, flocoumafen, brodifacoum, bromadiolone, and difenacoum at concentrations of 0.86-87.0 ng L(-1). Considering water volumes of each WWTP, daily emissions were estimated to be 0.02 to 21.8 g day(-1), and thus, WWTPs contribute to the loads of anticoagulants to receiving waters. However, low aquatic toxicity was observed using Daphnia magna as a model aquatic organism.

Topics: 4-Hydroxycoumarins; Animals; Anticoagulants; Daphnia; Environment; Risk Assessment; Rodenticides; Sewage; Spain; Toxicity Tests, Acute; Warfarin; Waste Disposal, Fluid; Wastewater; Water Pollutants, Chemical

A simple, accurate and sensitive method has been developed for the simultaneous determination of warfarin, coumatetralyl, bromadiolone, flocoumafen and brodifacoum in whole blood by high performance liquid chromatography (HPLC) with fluorescence detection. The five 4-hydroxycoumarin rodenticides in whole blood were extracted by ethyl acetate, separated on XDB C,, column( 150 mm x 2. 1 mm, 5 [microm) by using the mobile phase consisting of methanol-0. 2% acetic acid aqueous solution (88: 12, v/v) at a flow rate of 0. 5 mL/min and detected with a variational time program for fluorescence wavelength. Each analyte was qualitatively determined with its fluorescence excitation spectrum, fluorescence emission spectrum and retention time being compared with those of the reference standard, and quantified with external calibration method. The linear range was 0. 01 - 10. 00 mg/L and the limit of quantification was 0. 01 mg/L except warfarin of which the corresponding results were 0. 05 - 10. 00 mg/L and 0. 05 mg/L. The recoveries were between 81% and 98% and the relative standard deviations (RSDs) were between 3. 8% and 8. 5%. This method can be used in the diagnosis of the clinical poisoned patients.

Topics: 4-Hydroxycoumarins; Chromatography, High Pressure Liquid; Humans; Reproducibility of Results; Rodenticides; Warfarin