Methods for the chemical analysis of meteorites. I. Siderites

Abstract

SummarySimple chemical procedures (colorimetric and gravimetric) for the determination of Co, Cr, Cu, Ga, Ni, P, and S in an iron meteorite or in the separated metallic phase of a pallasite are described; the minimum size of sample is discussed. A procedure for the quantitative removal of the metallic, sulphide, and phosphide phases from a stone or siderolite is described, and is applicable to the quantitative isolation of silicate and oxide inclusions from siderites (other than some very high in nickel).

Analyses of Some Meteorites From the British Museum (Natural History) Collection

“…An analytical scheme was developed for the determination of Fe, Ni, Co, S, P, Cu, Cr, Ge and Ga on a single sample (Moss et al, 1961). The original colorimetric methods for the determination of Ni, Co, Cu and Cr have been replaced by Atomic Absorption Spectrophotometric analysis (A.A.S.).…”

“…The analytical techniques were updated to include the colorimetric determination of Fe, Ni, Co, Mn, Ti, Cr and P. "Classical" gravimetric methods were used for Si0 2 , A1 20 3 , CaO and MgO with two modifications. Firstly, total silica was determined by a combination of gravimetric and colorimetric methods (Jeffrey and Wilson, 1960) and secondly iron as Fe 3 + was extracted into di-isopropyl ether from 7M hydrochloric acid solution (Moss et al, 1961) to leave alumina as the major constituent of the ammonium hydroxide group precipitate. Sodium and potassium were determined by flame emission photometry.…”

Selective dissolution and determination of sulphides in nickel ores by the bromine-methanol method

“…Mention may be made of the bromi- nated water leach (Czamanske andIngamells 1970, Häkli 1971), the dissolution in brominated water and carbon tetrachloride (Karapetjan 1968), the use of hydrogen peroxide and ammonium citrate (Katsnelson and Osipova 1960), the hydrogen peroxide and ascorbic acid leach (Lynch 1971) and chlorinating roast (Moss et al 1961 and1967). All these methods have certain disadvantages.…”

Flaws in the methodologies for organic carbon analysis in seagrass blue carbon soils

“…Another limitation of the acid‐digestion methods is linked to the risk of incomplete digestion of IC due to the presence of HCl‐resistant carbonate minerals (e.g., siderite; Moss et al, 1961) or when relying on the lack of effervescence as an indicator for the absence of IC (Lukasewycz and Burkhard 2005). Although the use of IRMS to estimate both OC and δ 13 C rather than OC estimates with EA alone can reduce the precision of OC estimates, it can contribute to determine the incomplete digestion of IC.…”