Determination of trace elements in carbonates by instrumental neutron activation analysis

Instrumental neutron activation analysis of carbonatites from Panda Hill and Oldoinyo-Lengai, Tanzania

“…The reliability of this method can be surely improved by using 49Ca and 47Ca as internal standards to correct fluctuation for neutron flux and counting geometry. 3 In order to understand the processes which controlled carbonatite melt generation, we need to elucidate the behavior of their trace elements. The characteristic features of trace elements in carbonatites are good indicators which provide clues regarding to the evolution of carbonatite.…”

Coprecipitation of strontium with marine Ca-Mg carbonates.

“…ficient of strontium between solution and Analytical method After carbonate carbonate precipitate (aragonite and calcite) in sample had been dissolved with 6M HCl solu the laboratory has been reported by many tion, calcium and magnesium were determined researchers (HOLLAND et al, 1963;BODINE et al, by EDTA titration (UENO, 1956), and strontium 1965; KINSMAN and HOLLAND, 1969; KITANO by atomic absorption spectrometry (YASUDA et al, 1971;KITANO and TERAO, 1972;KATZ and HASEGAWA, 1972) or by non-destructive et al, 1972). The results of the laboratory neutron activation analysis (OHDE et al, 1978). experiments have successfully explained the Crystal form was identified by X-ray diffraction relation between strontium content of low Mg method.…”

Na/Ca variability in coral skeletons

“…The slab was ultrasonically cleaned in distilled/ deionized water (DDW) and dried, then X-rayed. The Xradiography revealed coral skeletal growth patterns and Element/Ca ratio General range (mmol/mol) References Na/Ca 15−24 Amiel et al (1973), Land and Hoops (1973), Polyakov and Krasnov (1976), Swart (1981), Oomori et al (1982), Busenberg and Plummer (1985), Kitano (1990), Bar-Matthews et al (1993), Tsukamoto and Tsukamoto (1995), Mitsuguchi et al (2001), Ramos et al (2004) Sr/Ca 8.0−10.0 Weber (1973), Polyakov and Krasnov (1976), Goreau (1977), Smith et al (1979), Oomori et al (1982), Schneider and Smith (1982), Beck et al (1992), de Villiers et al (1994, Fallon et al (1999Fallon et al ( , 2003, Gagan et al S/Ca 4.0−10.0 Tokuyama et al (1972), Oomori et al (1982), Busenberg and Plummer (1985), Kitano (1990), Bar-Matthews et al (1993), Tsukamoto and Tsukamoto (1995) F/Ca 3.0−7.0 Carpenter (1969), Ohde et al (1978), Ohde and Ramos (2004), Ramos et al (2005) Mg/Ca 2.5−6.5 Chave (1954), Weber (1974), Goreau (1977), Oomori et al (1982), Mitsuguchi et al (1996Mitsuguchi et al ( , 2001Mitsuguchi et al ( , 2003Mitsuguchi et al ( , 2008, Sinclair et al (1998), Fallon et ...…”