GB/T 3260.6-2013Methods for chemical analysis of tin - Part 6: Determination of arsenic contents - Malachite green arsenic molybdenum heteropoly acid photometric method (English PDF)

3.1

arsenic-free zinc particles (phi3mm ~ phi7mm).

3.2

sulfate (rho1.84g/mL).

3.3

hydrochloride (rho1.19g/mL).

3.4

Hydrogen peroxide (30%).

3.5

sulfate (11).

3.6

sulfate (317).

3.7

hydrochloride (11).

3.8

hydrochloride (199).

3.9 stannous chloride solution (400g/L)

Weigh 40g of stannous chloride (SnCl2 · 2H2O) in 200mL beaker, add approximately 80mL of hydrochloric acid (3.7), 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

tartaric acid [L () - tartaric acid] solution (300g/L).

3.11 iodine absorption solution (2g/L)

Weigh 2g 4g of iodine and potassium iodide in a beaker, add a little water to dissolve, then diluted with water to 1L, and mix.

3.12 sodium sulfite solution (100g/L)

Using now.

3.13 ammonium molybdate solution (15g/L)

Weigh accurately 7.5g of ammonium molybdate [(NH4) 6Mo7O24 · 4H2O] in 400mL water micro beaker

Heat to dissolve, after cooling diluted with water to 500mL, transferred to a plastic bottle, and mix.

3.14 ammonium molybdate - sulfuric acid mixture

amount of an equal volume of ammonium molybdate solution (3.13) and sulfuric acid (3.6) in a plastic bottle, mix, using now.

3.15

Polyvinyl alcohol (PVA-124, degree of polymerization of 2400 to 2500) solution (10g/L). Dry filtration using a cotton.

3.16

Malachite Green (biological stain plain BS, molecular formula. C23H25ClN2, MW. 364.90) solution (1.5g/L). Weigh 0.300g hole

Finches malachite green in 80mL of ethanol (11) was dissolved, diluted with water to 200mL, and mix. Dry filtration using a cotton.