GB/T 34609.2-2020Method for chemical analysis of rhodium compounds - Part 2: Determination of silver,gold,platinum,palladium,iridium,ruthenium,lead,nickel,copper,iron,tin,zinc,magnesium,manganese,aluminium,calcium,sodium,potassium,chromium and silicon contents - Inductively c (English PDF)

3.1

Potassium hydroxide.

3.2

Nitric acid (rho=1.42g/mL).

3.3

Hydrochloric acid (rho=1.19g/mL).

3.4

Hydrogen peroxide (30%).

3.5

Nitric acid solution (1 1).

3.6

Hydrochloric acid solution (15 85).

3.7 Platinum standard storage solution

Weigh 0.1000g of platinum (mass fraction >=99.99%), place it in a 100mL PTFE beaker, and add

10mL hydrochloric acid (3.3) and 3mL nitric acid (3.2), cover with a watch glass, heat at low temperature to dissolve completely, transfer into a 100mL volumetric flask, add

10mL hydrochloric acid (3.3), dilute to the mark with water. Mix well. 1mL of this solution contains 1.0mg platinum;

3.8 Palladium standard storage solution

Weigh 0.1000g of palladium (mass fraction >=99.99%), place it in a 100mL polytetrafluoroethylene beaker, and add

3mL hydrochloric acid (3.3) and 1mL nitric acid (3.2), cover with a watch glass, heat at low temperature to dissolve completely, transfer into a 100mL volumetric flask, add

10mL hydrochloric acid (3.3), dilute to the mark with water. Mix well. 1mL of this solution contains 1.0mg of palladium.

3.9 Iridium standard storage solution

Weigh 0.1000g iridium powder (mass fraction >=99.99%), place it in a hard glass sealed tube, and add used ice water

Cooled 8mL hydrochloric acid (3.3), 2mL hydrogen peroxide (3.4), immediately use a gasoline blowtorch flame to melt and seal the pipe mouth of the hard glass sealing tube,

Put it in a steel bomb filled with kerosene, cover the inner cover, screw the outer cover, and then place it in a muffle furnace to heat up to 300°C±5°C, and dissolve at a constant temperature for 72h. take

Take out, cool, and freeze in the refrigerator for 2h. Take it out, immediately cut the mouth of the hard glass sealed tube with quartz sand, and use hydrochloric acid (3.3) for the test solution in the tube.

Wash into a 100mL volumetric flask and dilute to the mark with water. Mix well. 1mL of this solution contains 1.0mg of iridium.

3.10 Ruthenium standard storage solution

Weigh 0.1000g of ruthenium powder (mass fraction >=99.95%), add it to a 100mL quartz glass tube […]