GB/T 25494-2010Test methods for composition analysis of getters (English PDF)

4.1 gravimetric method

4.1.1 Application

Gravimetric method applies to compound barium getter carrier measurement when large steamed barium barium film to 20mg, also applies to the barium film evaporated

Determination of barium.

4.1.2 Principle

Barium barium or steam contained in the film getter barium compound in the form of barium sulfate precipitation, precipitate after filtration, ash and burning said

Weight, in terms of barium.

4.1.3 Reagents and materials

a) hydrochloric acid solution (21%). The AR concentrated hydrochloric acid and an equal volume of deionized water and mix;

b) hydrochloric acid solution (0.5%). 1 AR concentrated hydrochloric acid and 87.5 parts of deionized water were mixed;

c) sulfuric acid solution (36%). 1 part of concentrated sulfuric acid and 3 parts of analytically pure deionized water and mix.

4.1.4 Equipment and containers

a) analytical balance with an accuracy of 0.1mg;

b) box-type furnace, the maximum temperature of 1000 °C;

c) a ceramic crucible;

d) triangular beaker;

e) flask;

f) ash-free filter paper.

4.1.5 Analysis of step

4.1.5.1

take one or more of the getter material contained about 0.5g, placed in 500mL beaker (steamed for barium film on the bulb can be steamed

The nearly dry barium to 500mL beaker was washed with a small amount of 0.5% hydrochloric acid solution) was added 21% hydrochloric acid solution 25mL, and cook until heated to dissolve.

4.1.5.2

deionized water to 200mL, boiled, slowly adding 36% sulfuric acid solution 15mL, stirring constantly, barium sulfate completely

After precipitation, 36% sulfuric acid was added about 1mL (sulfuric acid solution should be added slowly, stirring constantly to avoid splashing out of precipitation wounding).

GB/T 28159-2025 | GB/T 37406-2019 | GB/T 29848-2018 | GB/T 25497-2010 | GB/T 25496-2010 | GB/T 25495-2010 | […]