Chemical and spectrochemical analysis of standard silicate samples

Technological behaviour of some Tunisian clays prepared by dry ceramic processing

“…Chemical analysis was obtained by atomic absorption spectrophotometry (AAS) using Polarized Zeeman equipment (Shimatzu Z-6100) following the methods applied to silicates (Ingamells & Suhr, 1963). The standard deviation is <5%.…”

Applications of the nitrous oxide-acetylene flame in chemical analysis by atomic absorption spectrometry

“…= Spectrographic results (13). 0 Oil (2.5 grams) was incinerated with sulfur (0.25 gram), the ash dissolved in 2 drops of sulfuric acid, made up with water to 2.5 ml, and measured against ammonium vanadate solutions acidified with sulfuric acid.…”

X-ray spectrometric analysis of major and selected minor elements in silicate rocks utilizing an automatic fusion technique

“…The percent relative standard deviation values displayed in the 3rd and 6th columns of Table 5 represent a measure of the precision of the method, as regards sample preparation and instrumentation errors, including counting errors. Table 6 compares the matrix-corrected XRF data obtained from the international reference standards, utilizing a multiple linear regression program (MLRP), with the recommended chemical values (Flanagan, 1969(Flanagan, , 1973Abbey, 1972Abbey, , 1973Abbey, , 1977Ingamells and Suhr, 1963;Goldich and others, 1967;Ingamells and others, 1971; de la Roche and Govindaraju, 1971Govindaraju, , 1973Loney and others, 1971;Crock, 1975;Huffman, pre-1976;Myers and others, 1976) for the major element oxides of the calibration standards. The upper limits of the working concentration ranges for certain of the elements have since been extended upward as follows: Si02: 90%; Ti02: 3.5%; MnO: 1.5%; and ?2®5 : 2 -°^-Accuracy for these primary standards was measured as the average absolute relative error or difference between the matrix-corrected XRF intensity values of the various elements analysed for, translated into concentrations, and "best value" literature concentration values.…”

“…The chemical, elemental oxide concentration values adopted for the standards were published or recommended literature values (Flanagan, 1969(Flanagan, , 1973Abbey, 1972Abbey, , 1973Abbey, , 1977Ingamells and Suhr, 1963;Goldich and others, 1967;Ingamells and others, 1971; de la Roche and Govindaraju, 1971Govindaraju, , 1973Loney and others, 1971;and Crock, 1975) with the exception of two Cr values (Huffman). The GSE synthetic standard values (Myers and others, 1976) were appropriately recalculated for the additional amounts of minor or major elements added (Table 1).…”