Title:
INORGANIC SUBSTANCE TREATMENT
Document Type and Number:
Japanese Patent JP2695310
Kind Code:
B2
Abstract:
PURPOSE: To obtain a pretreatment method whereby an inorganic substance is completely decomposed and a sample is turned to a solution without accompanying volatilization of the component and contamination from the environment, and to improve the analyzing accuracy when using the method.
CONSTITUTION: An inorganic substance such as graphite or the like is put in a sealed container 4 together with an acid, and retained at high temperatures for a given time, so that the inorganic substance is decomposed and turned to a solution. The acid added in the sealed container is, for example, HNO3, HCl, H2SO4 etc., and the amount of the acid is desirably such that the weight ratio between the inorganic substance and acid is 1: not smaller than 5. The amount of water added into the container 4 satisfies 50% or lower of the volume ratio to the total amount of the inorganic substance, acid and water so as to increase the decomposition ratio by the strong acid. The sealed container 4 is retained at 180°C or higher. Moreover, the retaining temperature should be low as the heat proof temperature of the container, the evaporation temperature of a component of a low melting point and the like are taken into consideration. Although the sealed container 4 is preferable to be retained for a long time to enhance the decomposition ratio, at least 24 hours or longer is desired.
More Like This:
| JPH02110350 | QUICK ANALYZING METHOD OF HIGH PURITY GAS |
Inventors:
Yukihiro Koshino
Akira Ikukawa
Akira Ikukawa
Application Number:
JP19007791A
Publication Date:
December 24, 1997
Filing Date:
July 30, 1991
Export Citation:
Assignee:
Nippon Insulator Co., Ltd.
International Classes:
G01N21/73; G01N1/28; G01N31/00; (IPC1-7): G01N1/28; G01N21/73; G01N31/00
Domestic Patent References:
| JP6258142A | ||||
| JP61206845U |
Attorney, Agent or Firm:
Hattori Masaki