Patent ID: 7782456
Filing Date: 2010-08-24
Classification: G01N

Abstract:
1. A method for analyzing a solid sample by an inductively coupled plasma-aided emission spectrometer into which the sample is directly injected after being finely powdered, comprising the steps of: directly injecting a finely powdered solid sample together with a carrier gas into an inductively coupled plasma-aided emission spectrometer, wherein a surface of the solid sample has been subjected to a spark discharge to form a fine powder, and analyzing the finely powdered solid sample; analyzing, by a spectrometer, standard liquid samples containing an objective element at a known concentration to establish a calibration curve for liquid samples, a chart being established for each objective element, analyzing at least one standard solid sample containing the objective element at a known concentration, after it is finely powdered, and determining a conversion factor by one of the following procedures (a) and (b), by which the result of the finely powdered solid sample is corrected using the above conversion factor: (a) find a concentration corresponding to an emission intensity measured for a standard solid sample based on a calibration curve with liquid samples, and use ratio of actual concentration in the standard solid sample to the found one as a conversion factor, and (b) use a ratio of an emission intensity observed by analysis of the standard solid sample to that at the same concentration in the calibration curve established with liquid samples as a conversion factor.