KJELDAHL NITROGEN METHOD 243 



turn pink or purple, add more alkali as above. Distill the lib- 

 erated ammonia into the standard acid. When about % of 



FIG. 3. APPARATUS FOR DISTILLING TOTAL NITROGEN BY KJELDAHL METHOD. 



the water has distilled over, remove the Woulff bottle and test 

 the next drop of distillate for ammonia by letting it fall into a 



