Determination of cadmium and lead in edible oils by electrothermal atomic absorption spectrometry after reverse dispersive liquid-liquid microextraction.
The dispersive liquid-liquid microextraction of edible oils with a low volume of an acidic solution in the presence of isopropyl alcohol allows cadmium and lead to be completely separated into the aqueous phase. After centrifugation, the metals are determined by electrothermal atomization atomic absorption spectrometry using a palladium salt for chemical modification in the heating cycle. Using a 10 g oil sample, the enrichment factor is 140, which permits detection limits of 0.6 and 10 ng kg(-1) for cadmium and lead, respectively. The results agree with those obtained after sample mineralization. Data for the cadmium and lead levels for 15 samples of different characteristics are given.
Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, E-30071 Murcia, Spain.
Ignacio
I
López-García
Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, E-30071 Murcia, Spain.
Yesica
Y
Vicente-Martínez
Department of Analytical Chemistry, Faculty of Chemistry, Regional Campus of International Excellence "Campus Mare Nostrum", University of Murcia, E-30071 Murcia, Spain. Electronic address: hcordoba@um.es.
Manuel
M
Hernández-Córdoba
D019840:2-Propanol / Q000737:chemistry; D000143:Acids / Q000737:chemistry; D002104:Cadmium / Q000032:analysis* / Q000302:isolation & purification; D005395:Fish Oils / Q000737:chemistry; D006358:Hot Temperature; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000032:analysis* / Q000302:isolation & purification; D059627:Liquid Phase Microextraction / Q000379:methods*; D009821:Oils / Q000737:chemistry*; D010165:Palladium / Q000737:chemistry; D010938:Plant Oils / Q000737:chemistry; D015203:Reproducibility of Results; D012996:Solutions / Q000737:chemistry; D013054:Spectrophotometry, Atomic / Q000379:methods*
D000143:Acids; D005395:Fish Oils; D009821:Oils; D010938:Plant Oils; D012996:Solutions; D002104:Cadmium; D007854:Lead; D010165:Palladium; D019840:2-Propanol
Cadmium; DLLME; ETAAS; Edible oils; Lead; Reverse dispersive liquid–liquid microextraction