Division 5 APPARATUS AND GLASSWARE

Usual laboratory equipment and, in particular:

1. 5.1.

   Kjeldahl flasks of capacity 500 ml.

2. 5.2.

   Suitable boiling aids, for example, glass beads of diameter approximately 5 mm, Hengar granules, pumice.

3. 5.3

   Burette or automatic pipette, to deliver 1,0 ml.

4. 5.4.

   Graduated measuring cylinders, glass, of capacities 50, 100 and 250 ml.

5. 5.5.

   Digestion apparatus in an inclined position (approximately 45^o), with electric heaters or gas burners that do not heat the flasks above the level of their contents, with a fume extraction system.

6. 5.6.

   Distillation apparatus, made of borosilicate glass, to which a Kjeldahl flask (5.1.) can be fitted, consisting of an efficient splash-head connected to an efficient condenser with straight inner tube and an outlet tube attached to its lower end; the connecting tubing and stopper (s) shall be close-fitting and preferably of neoprene rubber.

7. 5.7.

   Pipette or automatic pipette, to deliver 0,10 ml.

8. 5.8.

   Conical flasks, of capacity 500 ml, graduated at 200 ml.

9. 5.9.

   Burette of capacity 50 ml, gratuated in 0,1 ml, maximum error ± 0,05 ml.

10. 5.10.

    Magnifying lens, for reading the burette (5.9.).

11. 5.11.

    pH meter

12. 5.12.

    Automatic burette.