title: Dispersive liquid-liquid microextraction of lead(II) as 5-(4-dimethylaminobenzylidene) rhodanine chelates from food and water samples.
abstract: A dispersive liquid-liquid microextraction procedure for lead(II) as its 5-(4-dimethylaminobenzylidene) rhodanine complex has been established prior to its microsampling flame atomic absorption spectrometric determination. The influences of various analytical parameters including pH, solvent type and volume, dispersive solvent type and volume, 5-(4-dimethylaminobenzylidene) rhodanine amount, salt effect, and centrifugation time and speed were investigated. The effects of certain alkali, alkaline earth, and transition metal ions on the quantitative extraction of lead(II) were also studied. Quantitative recoveries were obtained at pH 6. The enrichment factor was calculated as 125. The detection limit for lead is 1.1 μg/L. The accuracy of the method was tested with the additions recovery test and analysis of the standard reference materials (SPS-WW2 waste water, NIST SRM 1515 apple leaves, and TMDA-51.3 fortified water). Applications of the present procedure were tested by analyzing water and food samples.
authors.affiliation: Advanced Materials Research Chair, Chemistry Department, College of Science, King Saud University, Riyadh, 11451, Kingdom of Saudi Arabia.
authors.forename: Zeid A
authors.initials: ZA
authors.lastname: Alothman
authors.forename: Nora H
authors.initials: NH
authors.lastname: Al-Shaalan
authors.forename: Mohamed A
authors.initials: MA
authors.lastname: Habila
authors.forename: Yunus E
authors.initials: YE
authors.lastname: Unsal
authors.forename: Mustafa
authors.initials: M
authors.lastname: Tuzen
authors.forename: Mustafa
authors.initials: M
authors.lastname: Soylak
mesh_terms: D002614:Chelating Agents / Q000737:chemistry*; D004784:Environmental Monitoring; D004785:Environmental Pollutants / Q000032:analysis* / Q000737:chemistry; D005504:Food Analysis; D005506:Food Contamination; D007854:Lead / Q000032:analysis* / Q000737:chemistry; D057230:Limit of Detection; D059627:Liquid Phase Microextraction; D012236:Rhodanine / Q000032:analysis / Q000737:chemistry*; D062065:Wastewater; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D004785:Environmental Pollutants; D007854:Lead; D012236:Rhodanine; D062065:Wastewater; D014874:Water Pollutants, Chemical