GB/T 3253.6-2008Methods for chemical analysis of antimony and antimony trioxide - Determination of selenium content - Atomic fluorescence spectrometer method (English PDF)

3.1 commercially available reagents

3.1.1

potassium borohydride.

3.1.2

hydrochloric acid (rho1.19g/mL).

3.1.3

nitrate (rho1.42g/mL).

3.2 solution

3.2.1

aqua regia (when used with now).

3.2.2

hydrochloric acid solution (1 + 1).

3.2.3

Sodium hydroxide solution (100g/L, formulated with excellent pure sodium hydroxide).

3.2.4 solution of potassium borohydride (15g/L)

Weigh 7.50g potassium borohydride (3.1.1), add 25mL of sodium hydroxide solution (3.2.3), dissolve completely, add water to 500mL, with

When existing service.

3.2.5

tartaric acid solution (200g/L, formulated with excellent pure tartaric acid).

3.3 standard solution

3.3.1 selenium standard stock solution (100µg/mL)

Weigh 0.1000g selenium (>=99.99%) in 100mL beaker, was added 5mL of nitric acid (3.1.3), and dissolved by heating on a boiling water bath for evaporation

Dry, cooled, dissolved in water and transferred to 1000mL volumetric flask, dilute with water to volume, and mix. This solution 1mL containing 100µg selenium.

3.3.2 selenium standard solution (1µg/mL)

Pipette 10.00mL selenium standard stock solution (3.3.1) in 1000mL volumetric flask, dilute with water to volume, and mix. This solution

1mL containing 1µg selenium.

3.3.3 selenium standard solution (0.1µg/mL)

Pipette 1.00mL selenium standard solution (3.3.2) in 100mL volumetric flask, dilute with water to volume, and mix. This solution containing 1mL

0.1µg selenium.

3.4 Material

Argon (>=99.99%). shielding gas and carrier gas.