Linked Life Data

19836510

Source:http://linkedlifedata.com/resource/pubmed/id/19836510

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2009-10-19
pubmed:abstractText
Partitioned dispersive liquid-liquid microextraction (PDLLME), using THF as the dispersive solvent and dichloromethane as the extraction solvent, was utilized to isolate and concentrate phenylurea herbicides (PUHs) from aqueous samples. In PDLLME, a dispersive solvent should be able to partition in the organic extractant droplets to effectively extract the polar organic compounds from aqueous samples. The mixture of the water-immiscible extractant and the partitioned dispersive solvent was obtained by centrifugation, dried under low pressure, reconstituted in methanol-water mixture (1:1), and injected into a HPLC system for the determination of PUHs. The enrichment factors of the PUHs ranged from 68 to 126 under the optimal conditions. The linear range was 0.5-100 ng ml(-1) for each analyte, the relative standard deviations of PUHs were in the range of 1.5-5.9% (n=5), and the detection limits (signal-to-noise ratio of 3) ranged from 0.10 to 0.28 ng ml(-1) for the herbicides. The range of intraday precision (n=5) for PUHs at the levels of 0.5, 5, and 50 ng ml(-1) were 3.0-5.9%, 1.8-3.3%, and 2.2-3.6%, respectively. The range of interday precision (n=5) at 0.5, 5, and 50 ng ml(-1) were 0.4-1.8%, 1.2-2.4%, and 0.9-2.3%, respectively. The recoveries of PUHs from three spiked river water samples, at a level of 10 ng ml(-1), were 91.2-104.1%. Due to its rapidity, ease of operation, and high recovery, PDLLME can be utilized to isolate and concentrate organic environmental contaminants such as PUHs from aqueous samples.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Dec
pubmed:issn
1873-3573
pubmed:author
pubmed:issnType
Electronic
pubmed:day
15
pubmed:volume
80
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
493-8
pubmed:meshHeading
pubmed:year
2009
pubmed:articleTitle
Determination of phenylurea herbicides in aqueous samples using partitioned dispersive liquid-liquid microextraction.
pubmed:affiliation
Department of Chemistry, Soochow University, Shihlin, Taipei, Taiwan.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't