Automatic determination of total aliphatic amines by on-line photometric liquid-liquid microextraction.
An automatic flow method for the determination of total aliphatic amines has been developed. Using an integrated micro extraction unit at the detection point that allows continuous on-line monitoring of small organic plug from which amines are extracted. It is based on the formation of ion-pairs between aliphatic amines and sodium 1,2-naphthoquinone-5-sulphonate that are subsequently extracted into chloroform. The gradual enrichment of the organic phase with the ion-pair is continuously monitored at 460 nm. Absorbance readings at a fixed time and the slopes of absorbance-time recordings are the measured parameters used for determination purposes. The proposed method has been applied to the determination of total aliphatic amines in both synthetic and real (food) samples.
Fernández
J M
JM
Department of Analytical Chemistry ETSIAM, Faculty of Sciences, University of Córdoba, E-14004, Cordoba, Spain.
Ríos
A
A
Valcárcel
M
M