Optimization and validation of a new method for analysis of linear alkylbenzene sulfonates in sewage sludge by liquid chromatography after microwave-assisted extraction

2007 ◽  
Vol 599 (1) ◽  
pp. 92-97 ◽  
Author(s):  
M. Villar ◽  
M. Callejón ◽  
J.C. Jiménez ◽  
E. Alonso ◽  
A. Guiráum
Keyword(s):  
Liquid Chromatography ◽  
Sewage Sludge ◽  
New Method ◽  
Microwave Assisted Extraction ◽  
Linear Alkylbenzene ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Linear Alkylbenzene Sulfonates

scholarly journals Optimization of a microwave-assisted extraction procedure for the determination of selected alkyl, aryl, and halogenated phenols in sewage sludge and biosolids

2016 ◽  
Vol 51 (4) ◽  
pp. 344-356 ◽  
Author(s):  
Hing-Biu Lee ◽  
M. Lewina Svoboda ◽  
Thomas E. Peart ◽  
Shirley Anne Smyth
Keyword(s):  
Sewage Sludge ◽  
Extraction Procedure ◽  
Negative Ion ◽  
Gas Chromatography Mass Spectrometry ◽  
Microwave Assisted Extraction ◽  
Alkyl Aryl ◽  
Microwave Assisted ◽  
Assisted Extraction ◽  
Halogenated Phenols

A microwave-assisted extraction method for the determination of 15 alkyl, aryl, and halogenated phenols in sewage sludge and biosolids samples was developed and optimized. The effects of solvent, temperature, time, moisture content, acid, and number of extractions on the recovery of phenols were evaluated. Results indicated that extraction solvent had the greatest impact on the recovery of all phenols while pH had the largest effect on recovery of hexachlorophene and pentachlorophenol. Wet sludge samples were extracted with acetone-hexane mixture in the presence of glacial acetic acid. The extract was evaporated, acetylated by acetic anhydride and cleaned up by silica gel. For dry sludge samples, an optional procedure for the simultaneous extraction and acetylation of phenols was also proposed. Triclosan (TCS) and the alkyl and aryl phenols in sludge extracts were analyzed by gas chromatography-mass spectrometry (GC-MS) in electron-impact mode while polyhalogenated phenols were analyzed by GC-MS in negative ion chemical ionization mode. Method detection limits were ca. 200 ng/g for nonylphenol, <25 ng/g for TCS and other alkyl and aryl phenols, and <5 ng/g for other halogenated phenols. This method has been applied to the determination of phenolic compounds in over 150 sludge and biosolids samples since 2009.

scholarly journals Screening of Carbamates and Ureas in Fresh and Processed Tomato Samples using Microwave-Assisted Extraction and Liquid Chromatography

2009 ◽  
Vol 42 (2) ◽  
pp. 265-283 ◽  
Author(s):  
Paula Paíga ◽  
Simone Morais ◽  
Manuela Correia ◽  
Arminda Alves ◽  
Cristina Delerue-Matos
Keyword(s):  
Liquid Chromatography ◽  
Microwave Assisted Extraction ◽  
Microwave Assisted ◽  
Assisted Extraction
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