Preconcentration of an analyte dialysate in a flow-injection system

✍ Scribed by J.F. van Staden; C.J. Hattingh

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 738 KB
• Volume: 308
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/0003-2670(94)00479-6

✦ Synopsis

Preconcentration of an analyte dialysate was studied in a flow-injection system where hyphenation of the dialysis/preconcentration was done on-line. The dependence of the combined dialysis/preconcentration process on a number of variables was evaluated and optimised. As timing played a very important role in the whole system, a time regulated system from a computer was employed to control various functions of the system. The system was applied to the determination of copper in food supplements containing vitamin-mineral conditioners for dogs and cats. Suitable results were obtained from a calibration curve between 0.5 and 5 mg/l of soluble copper with a detection limit of 0.295 mg/l. The values obtained by the hyphenated dialysis/preconcentration/FIA system compared favourably with the standard manual atomic absorption spectrometric method and the value of 0.05% (m/m> given by the producers. A relative standard deviation of 5.74% was obtained.