萤石标准物质中碳酸钙定值问题的探讨

ON THE DETERMINATION OF CaCO_3 VALUE IN THE STANDARD MATERIAL OF FLUORSPAR

本文研究了在HAc(1+9)介质中,将CaCO_3浸取后,在浸取液中用光度法测定微量氟,并在每一个试样中采用相应地校正系数,从而建立了一个用光度法测氟来校正CaCO_3测定值的方法,已用于萤石一级标准物质中CaCO_3的测定。同时对国内外有关方法进行了对照试验,证明本试验方法准确可靠。

The trace elements of fluorine in the solution medium were measured by Luminosity method immediately after the CaCO_3 bearing fluorspar was withdrawn from the immersion medium HAc (1+9),and the corresponding correction factors were used for each sample in the measurement so that the method for adjustment of CaCO_3 measurement could be established by determing—F content in the solution mediun by luminosity method. This method has been applied to the measurement on CaCO_3 in the first grade fluorspar. In comparison with methods adopted at home and abroad the present oneis proved to be of higher accuracy and reliability.