Product material:
Silver crucibles are made of pure silver (containing trace amounts of gold, copper, lead, antimony, etc.). It can be dissolved by acids, especially hot nitric acid and concentrated sulfuric acid, and is also easily corroded by alkaline solvents, so the use time should be as short as possible.
Product Code | Specification | Packing` |
W-006801 | 30ml /30g | 1 set/box |
W-006802 | 50ml /50g | 1 set/box |
PRECAUTIONS FOR USE
(1) The temperature of the molten sample shall not exceed 700'℃.
(2) Once the silver crucible is heated, there will be a layer of oxide on the surface to protect it from the erosion of potassium hydroxide or sodium hydroxide. It can also be used as a mixed flux of sodium carbonate (potassium carbonate) and sodium nitrate (sodium peroxide). The sintering method decomposes the sample, but the edges in contact with air have a slight effect.
Therefore, the melting time should not be too long, generally no more than 30 minutes.
(3) Silver easily reacts with sulfur to form silver sulfide, so it is not allowed to use silver crucibles to decompose or burn sulfur-containing substances, nor to use alkaline sulfide fluxes.
(4) In the molten state, metal salts such as aluminum, zinc, tin, lead, and mercury can make the silver crucible brittle, and borax cannot be melted or burned in the crucible.
(5) After heating and melting the silver crucible, do not immediately cool it with cold water to avoid cracks.
(6) Since silver is easily soluble in acid, the molten material cannot be leached with acid, especially concentrated acid.
Maintenance and management
(1) Silver crucible can replace nickel crucible for melting. The melting temperature generally does not exceed 700°C above that of silver crucible.
(2) Use a silver crucible to decompose the sample with a mixed flux of NaOH, NazO₂, NaNos and NazO: but do not decompose or burn sulfur-containing substances in the silver crucible and use sulfide flux.
(3) When measuring sulfur in the sample, silver crucibles cannot be used because black silver sulfide can be generated.
(4) The crucible cannot be heated directly on an open flame.
(5) Do not use too much force when taking out the crucible to avoid deformation or unevenness. Do not use the tip of a glass rod to take out the contents of the crucible.
(6) When the crucible is not in use, keep it in a safe with the crucible tongs.
(7) When employees leave their posts, they must check the doors and windows, lock the doors, check immediately when they return to their posts, and report any problems to their leaders immediately.
(8) While checking whether the crucible exists, check whether the crucible is clean.
