Dispersion behaviour of solid particles in flow-injection analysis

Abstract

In order to achieve a reproducible on-line pretreatment of slurry samples in flow-injection analysis the dispersion behaviour of these samples has to be examined. This paper reports the effects of flow rate and some configurations of reaction manifolds. The reaction manifolds were a straight tube and two helically coiled tubes with different aspect ratios and spatial orientation. The slurry samples consisted of spheres of different densities suspended in a Triton X-100/water solution, the particle diameters (up to 75 ~tm) were relatively large compared to the internal diameter of the tubing (0.75 ram). For the straight tube theoretical calculations were found to give a reasonable impression of the experimental flow behaviour of the spheres. Statistical moments were used to characterize the slurry peaks. For tightly coiled tubes it was found that the retention time of a slurry sample depends on the particle density. The spatial orientation of the coils mainly affects the retention of high density particles.

Microwave digestion procedures for environmental matrices

“…Samples can then be digested in either a continuous or stopped flow system for on-line analysis 22,24,35,36,86,88,89,93,98,138 or collected for separate treatment. 32,35,54,83,84,94 Hulsman et al 192 investigated the dispersion behaviour of solid particles in flow injection analysis in order to help achieve reproducible pre-treatment procedures.…”

Future of atomic spectrometry for environmental analysis

“…Automated injection of slurry samples into flowing streams has also been demonstrated. 69 Conventional laser ablation of solid samples and in situ laser Future instrumentation ablation ICP are currently popular techniques by virtue of the Enhanced throughput will clearly be achieved by more frequent use of techniques that efficiently generate multielement inforavailability of high-power Nd5YAG laser sources operating in Faster sample processing is often limited by the speed of source mass spectrograph for true simultaneous multielement detection. Promising performance criteria could be met with sample preparation.…”

Evaluation of transversal and longitudinal dispersion in a flow injection system by exploiting laser induced fluorescence: influence of flow-cell positioning

“…Dispersion controls the interaction between carrier, reagent and sample solutions, and leads to intermolecular interactions and chemical processes like reactions. This is the case in liquid-liquid [2,3] and solid-liquid extraction [4], sample dilution [5], column chromatography [6], nanodevices [7] and capillary electrophoresis [8].…”