Carbon and Oxygen isotopes determination for carbonate samples at Research Institute for Hazards in Snowy Area, Niigata University

Measurements of carbon and oxygen isotope ratios for carbonate samples were started in earnest on a Micromass PRISM mass spectrometer in the Research Institute for Hazards in Snowy Areas, Niigata University. Carbonate samples were treated with 100% phosphoric acid at 190℃. The automatic front treatment device (MultiPrep) reduced the size of samples and cased the extraction and refining of CO_2 from carbonate samples. The δ^<13>C and δ^<18>O values of new laboratory standards are δ^<13>C_<VPDB>=4.76‰ andδ^<18>O_<VPDB>=-6.13‰ (FLD) and δ^<13>C_<VPDB>=-32.19‰ and δ^<18>O_<VPDB>=-22.44‰ (NCC), respectively. The new laboratory standards are effective in the correction of most unknown samples