title: Method for the determination of cadmium, lead, nickel, cobalt and copper in seafood after dispersive liquid-liquid micro-extraction.
abstract: A method using dispersive liquid-liquid micro-extraction (DLLME) and detection by inductively coupled plasma optical emission spectroscopy (ICP-OES) was developed for the determination of trace elements in seafood samples. The procedure allowed the simultaneous determination of Cd(II), Pb(II), Ni(II) Cu(II) and Co(II) after pre-concentration using sodium diethyldithiocarbamate (DDTC) as a chelating agent. Under optimised conditions, the method had a limit of detection (LOD) of 0.03, 0.11, 0.12, 0.18 and 0.12 µg l(-1) for Cd(II), Pb(II), Ni(II) Cu(II) and Co(II), respectively. The following enrichment factors were obtained: 16 (Cd), 34 (Pb), 20 (Ni) 34 (Cu) and 12 (Co). The procedure was applied for the determination of these elements in seafood (shrimp, mussel, bass and mullet) samples. The method is simple, efficient and easy to perform for the simultaneous determination of elements in seafood samples by ICP-OES.
authors.affiliation: a Laboratório de Química Analítica (LQA) , Universidade Estadual do Sudoeste da Bahia , Jequié , BA , Brazil.
authors.forename: Valfredo Azevedo
authors.initials: VA
authors.lastname: Lemos
authors.forename: Emanuel Vitor
authors.initials: EV
authors.lastname: dos Santos Vieira
mesh_terms: D002104:Cadmium / Q000032:analysis / Q000302:isolation & purification; D002614:Chelating Agents; D003035:Cobalt / Q000032:analysis / Q000302:isolation & purification; D003300:Copper / Q000032:analysis / Q000302:isolation & purification; D004050:Ditiocarb; D005504:Food Analysis / Q000379:methods; D007854:Lead / Q000032:analysis / Q000302:isolation & purification; D057230:Limit of Detection; D059627:Liquid Phase Microextraction; D009532:Nickel / Q000032:analysis / Q000302:isolation & purification; D017747:Seafood / Q000032:analysis*; D013054:Spectrophotometry, Atomic; D014131:Trace Elements / Q000032:analysis* / Q000302:isolation & purification
chemical_list: D002614:Chelating Agents; D014131:Trace Elements; D002104:Cadmium; D007854:Lead; D003035:Cobalt; D003300:Copper; D009532:Nickel; D004050:Ditiocarb
keywords: dispersive liquid–liquid micro-extraction; inductively coupled plasma optical emission spectroscopy; pre-concentration; seafood