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Automated injection of slurry samples in flow-injection analysis

✍ Scribed by M. Hulsman; M. Bos; W.E. van der Linden

Publisher: Elsevier Science
Year: 1996
Tongue: English
Weight: 637 KB
Volume: 324
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(96)00005-0

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✦ Synopsis

Two types of injectors are described for introducing solid samples as slurries in flow analysis systems. A time-based and a volume-based injector based on multitube solenoid pinch valves were built, both can be characterized as hydrodynamic injectors. Reproducibility of the injections of dispersed solids (< 150 pm) was tested with several concentrations of slurry samples up to 30 mg/ml; the injected volume was 1 ml. For both injectors dye and slurry samples could be injected with good precision (relative standard deviation for the peak area less than 2%). Peak detection was performed turbidimetrically. Data analysis and operation of the injectors were automated. The usual peristaltic pumps in flow analysis are normally not capable of handling slurries of the type investigated, therefore a valveless piston pump was used instead.

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