GB/T 23274.3-2009Methods for chemical analysis of stannic oxide - Part 3: Determination of arsenic content - Molybdoantimonyarsenate blue spectrophotometric method (English PDF)

3.1

arsenic-free zinc particles (u00d83mm ~ u00d87mm).

3.2

potassium chlorate.

3.3

sulfate (rho1.84g/mL).

3.4

sulfate (1 + 1).

3.5

sulfate (1 + 6).

3.6

hydrochloride (rho1.19g/mL).

3.7

HCl (1 + 1).

3.8

tartaric acid solution (300g/L).

3.9 stannous chloride solution (400g/L)

Weigh 40g of stannous chloride (SnCl2 · 2H2O) in 200mL beaker, add 80mL hydrochloric acid (3.6), cover the dish table, micro heat of solution is completely clear, and cooled to room temperature, hydrochloric acid (3.7) diluted to 100mL, and mix.

3.10 absorption solution (2g/L)

Weigh 1g and 5g potassium iodine tablets mixed, dissolved in water and diluted to 500mL.

3.11 ascorbic acid solution (30g/L)

now with the current.

3.12

ammonium molybdate solution (40g/L).

3.13

antimony potassium tartrate solution (4.5g/L).

3.14 color solution

Take 50mL sulfuric acid (3.5), 25mL ascorbic acid solution (3.11), 20mL ammonium molybdate solution (3.12), 5mL

Antimony potassium tartrate solution (3.13) and mix. The time is now equipped with.

3.15 arsenic standard stock solution

Weigh 0.1320g trioxide (reference reagent, pre-drying to a constant weight at 105 °C ± 5 °C), put

150mL beaker, 10mL sodium hydroxide solution (200g/L) dissolved, 5mL of sulfuric acid (3.3), 0.5mL of hydrogen peroxide (30%),

Heated to boiling for 10min, cooled to room temperature. Moved into 1000mL volumetric flask, dilute with water to volume, and mix. This solution containing 1mL

100µg arsenic.

3.16 Arsenic standard solution

Pipette 25.00mL arsenic standard stock solution (3.15), placed in 500mL volumetric flask, dilute to the mark,

Mix well. This solution 1mL containing 5µg arsenic.

3.17 arsine occurred and absorption devices

Arsine occurred and absorbing device shown in Figure 1.