Betekenis van:
pumice stone

Voorbeeldzinnen

1. Pumice stone
2. Granulated pumice stone, washed in hydrochloric acid and ignited.
3. Industrial diamonds, pumice stone, emery and other natural abrasives
4. Pumice stone; emery; natural corundum, natural garnet and other natural abrasives, whether or not heat-treated
5. Where the oil or fat has to undergo subsequent quality tests, replace the fragments of pumice stone by glass beads.
6. Take 50 ml of the solution and place in a small, dry, weighed flask containing fragments of pumice stone.
7. Collect the light petroleum extract in a dry, weighed flask containing fragments of pumice stone. Distil off the solvent.
8. Industrial diamonds, unworked or simply sawn, cleaved or bruted; pumice stone; emery; natural corundum, natural garnet and other natural abrasives
9. CPA 08.99.22: Industrial diamonds, unworked or simply sawn, cleaved or bruted; pumice stone; emery; natural corundum, natural garnet and other natural abrasives
10. Add 2 granules of pumice stone (3.13), heat, stirring by hand, over a free flame of medium height and bring the liquid to the boil in approximately two minutes.
11. Weigh 2,5 g of the sample to the nearest 1 mg (see point 8.2), place in a 400 ml beaker or a 300 ml conical flask and add 100 ml of hydrochloric acid (3.3) and fragments of pumice stone.
12. Weigh 5 g of the sample to the nearest 1 mg, transfer it to an extraction thimble (4.2) and cover with a fat-free wad of cotton wool. Place the thimble in an extractor (4.1) and extract for six hours with light petroleum (3.1). Collect the light petroleum extract in a dry, weighed flask containing fragments of pumice stone. Distil off the solvent.
13. Determine the lactose content according to Luff-Schoorl, as follows: add exactly 25 ml of Luff-Schoorl reagent (3.4) and two granules of pumice stone (3.5). Stir by hand-while heating over a free flame of medium height and bring the liquid to the boil in approximately two minutes.
14. Weigh 1 g of the sample to the nearest 0,001 g and transfer the sample to the flask of the digestion apparatus. Add 15 g of potassium sulphate (3.1), an appropriate quantity of catalyst (3.2) (0,3 to 0,4 g of copper (II) oxide or 0,9 to 1,2 g of copper (II) sulphate pentahydrate), 25 ml of sulphuric acid (3.4) and if required, a few granules of pumice stone (3.12) and mix.