TY - JOUR
T1 - Automatic determination of copper by in-syringe dispersive liquid-liquid microextraction of its bathocuproine-complex using long path-length spectrophotometric detection
AU - Horstkotte, Burkhard
AU - Alexovič, Michal
AU - Maya, Fernando
AU - Duarte, Carlos
AU - Andruch, Vasil
AU - Cerdá, Víctor
PY - 2012/9/15
Y1 - 2012/9/15
N2 - The recently proposed concept of automatic in-syringe dispersive liquid-liquid microextraction was successfully applied to the determination of copper in environmental water samples. Bathocuproine was added to the organic phase as a selective reagent, resulting in the formation of a complex with copper. Dispersion was achieved by aspiration of the organic phase and then the watery phase into the syringe as rapidly as possible. After aggregation of the solvent droplets at the head of the syringe, the organic phase was pushed into a liquid waveguide capillary cell for highly sensitive spectrophotometric detection. The entire analytical procedure was carried out automatically on a multisyringe flow-injection analysis platform and a copper determination was accomplished in less than 220 s. A limit of detection of 5 nmol L-1 was achieved at an extraction efficiency >90% and a preconcentration factor of 30. A linear working range for concentrations of up to 500 nmol L -1 and an average standard deviation of 7% in peak height were found. The method proved to be well-suited for the determination of copper in water samples, with an average analyte recovery of 100.6%.
AB - The recently proposed concept of automatic in-syringe dispersive liquid-liquid microextraction was successfully applied to the determination of copper in environmental water samples. Bathocuproine was added to the organic phase as a selective reagent, resulting in the formation of a complex with copper. Dispersion was achieved by aspiration of the organic phase and then the watery phase into the syringe as rapidly as possible. After aggregation of the solvent droplets at the head of the syringe, the organic phase was pushed into a liquid waveguide capillary cell for highly sensitive spectrophotometric detection. The entire analytical procedure was carried out automatically on a multisyringe flow-injection analysis platform and a copper determination was accomplished in less than 220 s. A limit of detection of 5 nmol L-1 was achieved at an extraction efficiency >90% and a preconcentration factor of 30. A linear working range for concentrations of up to 500 nmol L -1 and an average standard deviation of 7% in peak height were found. The method proved to be well-suited for the determination of copper in water samples, with an average analyte recovery of 100.6%.
KW - Bathocuproine
KW - Copper
KW - Dispersive liquid-liquid microextraction
KW - Liquid waveguide capillary cell
KW - Multisyringe flow injection analysis
UR - http://www.scopus.com/inward/record.url?scp=84866098809&partnerID=8YFLogxK
U2 - 10.1016/j.talanta.2012.05.063
DO - 10.1016/j.talanta.2012.05.063
M3 - Article
C2 - 22967563
AN - SCOPUS:84866098809
SN - 0039-9140
VL - 99
SP - 349
EP - 356
JO - Talanta
JF - Talanta
ER -