A Handbook of Silicate Rock Analysis by P.J. Potts

By P.J. Potts

The recommendations to be had for the chemical research of silicate with no an appreciation of what occurs in among. rocks have passed through a revolution during the last 30 years. despite the fact that, to take advantage of an analytical method such a lot successfully, now not is the analytical stability the one tool used it really is necessary to comprehend its analytical features, in for quantitative size, because it used to be within the days of classi­ specific the excitation mechanism and the reaction of the cal gravimetric systems. a large choice of instrumental sign detection process. during this publication, those features ideas is now common for silicate rock research, were defined inside of a framework of functional ana­ together with a few that comprise excitation resources and detec­ lytical aplications, in particular for the regimen multi-element tion structures which have been constructed basically within the previous couple of research of silicate rocks. All analytical strategies to be had years. those instrumental advancements now let a large for regimen silicate rock research are mentioned, together with variety of hint parts to be decided on a regimen foundation. a few extra really good methods. enough aspect is In parallel with those fascinating advances, clients have tended integrated to supply practitioners of geochemistry with a company to develop into extra distant from the information creation strategy. base from which to evaluate present functionality, and in a few this can be, partially, an inevitable results of the frequent intro­ instances, destiny advancements.

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Teflon is a fluorocarbon and is available in two forms. TFE (tetrafluoroethylene) and FEP (fluorinated ethylpropylene). Not only does Teflon have outstanding chemical resistance to acids, alkalis and organic solvents, but it can also be heated to temperatures of about 260cC without risk of thermal degradation. Moody (1982a) considers Teflon to be the cleanest of materials for ultra-trace analyses. It is, however, interesting to note that Dabeka eta!. (1976) found that Teflon-FEP bottles constituted a persistent source of iron, nickel, manganese and chromium, presumably from contamination introduced into the polymer during manufacture using stainless-steel moulds.

Flanagan (1976) also reports that the method of homogenizing samples and distributing sample bottles in a random manner was not unambiguously documented. This makes it difficult to be dogmatic in judging the vigorous debate that occurred in the literature between Chayes (1969, 1970) and Vistelius ( 1970, 1971) concerning the importance of inter-analyst differences or sample homogeneity in explaining the systematic bias in contributed data for G- I and W-1. 2 Other reference materials The experience with G-1 and W-1 clearly established the need for natural silicate rock reference materials.

5% sampling error is considered acceptable. lg of sample is adequate for analysis. 7g and 39g sample aliquots respectively. These data are subject to the same limitations as those described for gold above. However, the implication of these calculations is that there may be some samples containing relatively coarse zircon or gold grains for which sampling errors may be the dominant contribution to the overall analytical precision. 24). A prior knowledge of the grain size distribution is obviously invaluable in assessing the magnitude of this effect.

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