GB/T 3253.10-2009Methods for chemical analysis of antimony and antimony trioxide - Determination of mercury content - Atomic fluorescence spectrometric method (English PDF)

3.1

potassium borohydride.

3.2

hydrochloric acid (rho1.19g/mL pure class distinctions).

3.3

nitrate (rho1.42g/mL pure class distinctions).

3.4 aqua regia (1 + 1)

three volumes of hydrochloric acid (3.2), one volume of nitric acid (3.3), and four volumes of water mixed preparation.

3.5

hydrochloric acid solution (95 + 1).

3.6

potassium hydroxide solution (100g/L is formulated with superior grade purity potassium).

3.7

solution of potassium borohydride (0.5g/L). Weigh 0.25g potassium borohydride (3.1), add 25mL of potassium hydroxide solution (3.6), add 475mL

Water, dissolve completely when using existing service.

3.8

potassium dichromate solution (50g/L).

3.9 standard solution

3.9.1 Storage mercury standard solution

Accurately weigh 0.1354g dried 24h in advance with sulfuric acid mercuric chloride in 100mL beaker, add a small amount

Dissolved in water, was added 50mL of nitric acid (3.3), 10mL potassium dichromate solution (3.8). Moved into 1000mL volumetric flask, dilute to the mark with water

Degree, and mix. This solution containing 0.1mg of mercury per milliliter.

3.9.2

Mercury standard solution A. Pipette 10mL mercury standard stock solution (3.9.1) in 100mL flask, add 5mL nitric acid (3.3), 1mL potassium dichromate solution (3.8) diluted with water to volume, and mix. This solution containing 10µg per ml mercury.

3.9.3 Mercury standard solution B

Pipette 1.00mL mercury standard solution (3.9.2) in 100mL flask, add 5mL nitric acid (3.3),

1mL potassium dichromate solution (3.8) diluted with water to volume, and mix. This solution containing 0.1µg of mercury per milliliter.

3.10 Materials

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