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• Technical Reprints

Technical Journal Reprints

In developing the Chemplex product line, a great deal of experimentation was necessary to perform in order to ascertain the suitability of the product to its intended use and applications.

In some instances, this information was compiled and submitted to various trade journals for publication to illustrate and disseminate the methodology employed to arrive at the results. Reprints of the published articles are contained in this section for perusal in the belief that they will provide a benefit to the analyst in evaluating a product to relevant sample material preparations.

"Disposable Sample Cups for X-Ray Fluorescence Analysis" illustrates the research and development of XRF sample cups for containing invariable sample substances under various environmental conditions. It discusses and exhibits the first sample cup developed at a time when x-ray spectroscopy was entering the market as a very functional tool for analyzing innumerable types of sample substances in the petrochemical field. The evolution of the present day sample cups are easily recognized as the needs of the analyst expanded to include virtually any type of sample substance for quantifying an ever increasing number of elemental constituents in lower concentrations and to lower limits of detectability in less integration time.

Closely coupled to the development of consumable XRF sample cups was the necessity to compile data relevant to the thin-film substances that were available for containing various types of sample materials. This involved elaborate testing on the limited types and gauges of thin-film materials that were available and forming meaningful correlations for suitability of use. This also prompted the exploration of new thin-films as potential candidates with technological advancements in instrumentation. This is illustrated in "X-Ray Fluorescence Thin-film Sample Support Materials". Obviously with the passage of time, increased types and gauges of thin-films were investigated and improved mass attenuation coefficient values became available to better qualify thin-film substances.

The preparation of sample substances generally classified as powders represented another grouping of samples that warranted further investigation. This was particularly important in regard to the need to improve uniform particle size reduction and homogeneous distribution throughout the sample aliquot for greater analytical accuracy and precisions of measurement. Two basic concepts of comminution were examined: vigorous ball pestle impact on a powdered sample substance contained in various grinding media and controlled energetic gyratory impact of grinding media on a sample substance. The data derived from this experimentation lead to the development of the Chemplex SpectroMill® Ball Pestle Impact Grinder and the Chemplex GyralGrinder® Comminution Device. These published articles are respectively entitled "An Investigation of the Performance of Comminution Vials and Ball Pestle Impact Grinders" with respect to the SpectroMill, and "A Comminution Device for X-Ray Spectrochemical Analysis", representing the GyralGrinder.

Note: In some instances, photographs and more elaborate presentations were replaced to reflect the most recent findings without distorting the actual published conceptual content and methodology.