Microwave assisted solvent extraction (MASE) for the efficient determination of triazines in soil samples with aged residues

1996 ◽  
Vol 43 (9-10) ◽  
pp. 527-532 ◽  
Author(s):  
C. Molins ◽  
E. A. Hogendoorn ◽  
H. A. G. Heusinkveld ◽  
D. C. van Harten ◽  
P. van Zoonen ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Soil Samples ◽  
Microwave Assisted

scholarly journals Microwave-Assisted Extraction and Accelerated Solvent Extraction with Ethyl Acetate–Cyclohexane before Determination of Organochlorines in Fish Tissue by Gas Chromatography with Electron-Capture Detection

2000 ◽  
Vol 83 (6) ◽  
pp. 1334-1344 ◽  
Author(s):  
Marion Weichbrodt ◽  
Walter Vetter ◽  
Bernd Luckas
Keyword(s):  
Solvent Extraction ◽  
Fish Tissue ◽  
Solvent Mixture ◽  
Organochlorine Compounds ◽  
Water Removal ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Quantitative Extraction

Abstract Focused open-vessel microwave-assisted extraction (FOV–MAE), closed-vessel microwave-assisted extraction (CV–MAE), and accelerated solvent extraction (ASE) were used for extraction before determination of organochlorine compounds (polychlorinated biphenyls, DDT, toxaphene, chlordane, hexachlorobenzene, hexachlorocyclohexanes, and dieldrin) in cod liver and fish fillets. Wet samples were extracted without the time-consuming step of lyophilization or other sample-drying procedures. Extractions were performed with the solvent mixture ethyl acetate–cyclohexane (1 + 1, v/v), which allowed direct use of gel-permeation chromatography without solvent exchange. For FOV–MAE, the solvent mixture removed water from the sample matrix via azeotropic distillation. The status of water removal was controlled during extraction by measuring the temperature of the distillate. After water removal, the temperature of the distillate increased and the solvent mixture became less polar. Only the pure extraction solvent allowed quantitative extraction of the organochlorine compounds. For CV–MAE, water could not be separated during the extraction. For this reason, the extraction procedure for wet fish tissue required 2 extraction steps: the first for manual removal of coextracted water, and the second for quantitative extraction of the organochlorine compounds with the pure solvent. Therefore, CV–MAE is less convenient for samples with high water content. For ASE, water in the sample was bound with Na2SO4. The reproducibility for each technique was very good (relative standard deviation was typically <10%); the slightly varying levels were attributed to deviations during sample cleanup and the generally low levels.

scholarly journals Determination of Benzimidazole Fungicides in Soil Samples Using Microwave-Assisted Micellar Extraction and Liquid Chromatography with Fluorescence Detection

2006 ◽  
Vol 89 (5) ◽  
pp. 1403-1409 ◽  
Author(s):  
Radoslav Halko ◽  
Carolina PadrÓn Sanz ◽  
Zoraida Sosa Ferrera ◽  
JosÉ Juan Santana RodrÍguez
Keyword(s):  
Liquid Chromatography ◽  
Fluorescence Detection ◽  
Soxhlet Extraction ◽  
Soil Samples ◽  
Benzimidazole Fungicides ◽  
Microwave Assisted ◽  
Spiked Soil ◽  
Assisted Extraction ◽  
Direct Fluorescence

Abstract A simple and fast analytical method was developed for the determination of benzimidazole fungicides (benomyl, carbendazim, thiabendazole, and fuberidazole) in soil samples. The analytes were extracted from the soil samples by means of conventional microwave-assisted extraction, using the non-ionic surfactants polyoxyethylene 10 lauryl ether (POLE) and oligoethylene glycol monooalkyl ether (Genapol X-080) as extractants. Determinations were made by using liquid chromatography with direct fluorescence detection. The use of an analytical column Symmetry C-18 offered short retention times of analytes without the need of any pH regulators with mobile phase methanolwater (50 + 50, v/v). The best results were obtained using 5% (v/v) POLE as extractant with recoveries of the fungicides in spiked soil samples between 71 and 105%. The results were compared with those obtained when Soxhlet extraction was applied to the same soil samples.

Determination of simazine and cymoxanil in soils by microwave-assisted solvent extraction and HPLC with reductive amperometrical detection

2002 ◽  
Vol 55 (11-12) ◽  
pp. 667-671 ◽  
Author(s):  
O. López de Sabando ◽  
Z. Gómez de Balugera ◽  
M. A. Goicolea ◽  
E. Rodríguez ◽  
M. C. Sampedro ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Microwave Assisted
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