Linked Life Data

11009034

Source:http://linkedlifedata.com/resource/pubmed/id/11009034

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2001-2-2
pubmed:abstractText
We described here a solid-phase microextraction procedure used to extract six urea pesticides-- chlorsulfuron, fluometuron, isoproturon, linuron, metobromuron and monuron--from environmental samples. Two polydimethylsiloxanes and a polyacrylate fiber (PA) are compared. The extraction time, pH control, addition of NaCl to the water and the influence of organic matter such as humic acid on extraction efficiency were examined to achieve a sensitive method. Determination was carried out by gas chromatography with nitrogen-phosphorus detection. The proposed method requires the extraction of 2 ml of sample (pH 4, 14.3%, w/v, NaCl) for 60 min with the PA fiber. The limits of detection range from 0.04 for linuron to 0.1 microg/l for fluometuron and monuron and the relative standard deviations at the 1 microg/l level are between 15% and 9%. The apparent fiber-water distribution constants (Kfw) calculated in the proposed conditions were in the order of 10(3). Phenylurea herbicides were indirectly determined in the form of their derived anilines and chlorsulfuron in the form of an aminotriazine as confirmed by gas chromatography-mass spectrometry. Natural waters were utilized to validate the final procedure. However, a unequivocal identification in unknown environmental samples should be done by LC-MS. The presence of dissolved organic matter such as humic acid produces losses during the extraction step. Adding sodium chloride to the sample compensates for this effect.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0021-9673
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
890
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
303-12
pubmed:dateRevised
2009-1-15
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Indirect analysis of urea herbicides from environmental water using solid-phase microextraction.
pubmed:affiliation
Laboratori de Bromatologia i Toxicologia, Facultat de Farmàcia, Universitat de València, Burjassot, Spain.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't