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By P.J. Potts

The strategies to be had for the chemical research of silicate with no an appreciation of what occurs in among. rocks have gone through a revolution over the past 30 years. notwithstanding, to take advantage of an analytical method so much successfully, now not is the analytical stability the single device used it really is necessary to comprehend its analytical features, in for quantitative dimension, because it was once within the days of classi­ specific the excitation mechanism and the reaction of the cal gravimetric techniques. a wide selection of instrumental sign detection approach. during this ebook, those features strategies is now popular for silicate rock research, were defined inside a framework of sensible ana­ together with a few that include excitation resources and detec­ lytical aplications, particularly for the regimen multi-element tion platforms which were constructed purely 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 made up our minds on a regimen foundation. a few extra really good approaches. 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 knowledge construction technique. base from which to evaluate present functionality, and in a few this can be, partly, an inevitable results of the frequent intro­ circumstances, destiny advancements.

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Extra resources for A Handbook of Silicate Rock Analysis

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7 CONCEPTS IN ANALYTICAL CHEMISTRY chlorinated rubber paint being preferred in applications where lead is to be determined because of its very low inorganic lead content (v) Provision of overshoes, tacky mat and protective clothing at the entrances to the laboratory to reduce ingress of contamination with the analyst (vi) Design of the air supply system so that the clean laboratory is maintained at a small positive pressure compared with the surroundings-dust cannot then be sucked in. 12a,b) is unlikely to be satisfactory.

8 130 1 29 120 52? 120? 110? 020? 014 ( 118) 340 310 Stevens and Niles ( 1960) 210 88 81 80? 8? 22') 33? 52? 240? 35? 3 82') 100? 8) (23) 47? 1 J4? S? 5 15 76? 6? 8) (23) 47? 115? 8 21 35? 6? 58° 264? 025? 8 25? 50? 120° 110° 20? 10 17 78 so All data recalculated on a dry basis. 10 CONCEPTS IN ANALYTICAL CHEMISTRY (1963), Fleischer (1965) and the widely-used report of Flanagan (1973). As G-1 and W-1 were the first rock reference materials, it is relevant to examine what changes have occurred in average values reported in the literature at various stages since distribution.

It is then necessary either to rely on the specialized knowledge of the user, or to carry out analyses in duplicate on separate aliquots to check for errors in excess of those expected from instrumental factors. 7 Contamination effects Rock samples become contaminated from three principal sources: (i) Equipment used to split and crush materials down to a powder suitable for analysis (ii) The laboratory environment in which chemical manipulations are carried out (iii) Analytical reagents used in chemical preparation procedures in the course of an analysis.

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