Direct Introduction of Slurry Samples in Multi-syringe Flow Injection Analysis: Determination of Potassium in Plant Samples

The present work explores the slurry sampling approach for automatic, flow-based plant analysis. For this purpose, pinch valves were introduced into a multi-syringe flow injection analysis manifold to provide the repeatable aspiration of a few microliters of plant suspension before the material was...

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Bibliographic Details
Published in:Analytical Sciences 2008, Vol.24(5), pp.601-606
Main Authors: M. Inês G. S. ALMEIDA, SEGUNDO, Marcela A., José L. F. C. LIMA, António O. S. S. RANGEL
Format: Article
Language:English
Subjects:
Analytical Chemistry
Chemistry
Flow Injection Analysis - instrumentation
Flow Injection Analysis - methods
Microwaves
Online Systems
Original Paper
Plant Extracts - analysis
Plant Extracts - chemistry
Plants - chemistry
Potassium - analysis
Potassium - chemistry
Syringes
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Summary:The present work explores the slurry sampling approach for automatic, flow-based plant analysis. For this purpose, pinch valves were introduced into a multi-syringe flow injection analysis manifold to provide the repeatable aspiration of a few microliters of plant suspension before the material was further processed through the flow system. For validation of the proposed approach, the determination of potassium by flame emission spectrometry was implemented. Several parameters were studied: the concentration of plant particles in the sample suspension and the utilization of matrix modifiers. Microwave digestion was also implemented; no significant difference was found when certified reference material was analyzed with or without the in-line digestion step. The system was successfully applied to 13 samples within a concentration range of 2.5 to 100 mg g-1. A determination frequency of 28 h-1 was achieved and the precision was better than 4.0% (n = 12).
ISSN:0910-6340
1348-2246
DOI:10.2116/analsci.24.601