
Determination of hexanal and heptanal in human urine using magnetic solid phase extraction coupled with in-situ derivatization by high performance liquid chromatography
Keywords: MSPE, magnetic solid phase extraction; ISD, in-situ derivatization; DNPH, 2,4-dinitrophenylhydrazine; LODs, limits of detection; RSDs, relative standard deviations; Fe3O4/SiO2/P(MAA-co-EGDMA), magnetite/silica/poly(methacrylic acid-co-ethylene glycol dime