DETERMINATION OF COCONUT OIL. 



37^ 



in the other it has some action upon the oxidizable organic matter 

 present. The results recorded in the following table were obtained 

 under uniform conditions and with permanganate solutions which were 

 especially purified. All suspended oxides were removed by drawing the 

 solution through a tightly packed asbestos filter 10 centimeters thick. 

 A layer of oxides of manganese was visible on the top of the asbestos 

 and at no point was. the visible penetration greater than 1 millimeter. 



Table I. — Oxidation of -fats icith potassium permanganate solution. 



Labora- 

 tory 

 No. 



Samples. 



Cc. of 

 N 



iO per- 

 man- 

 ganate 

 used. 



Oxy- 

 geni3 

 equiv- 

 alent. 



Labora- 

 tory 

 No. 



Samples. 



Cc. of 

 N 

 10 per- 



man- 

 ganate 

 used. 



Oxy- 

 gen" 

 equiv- 

 alent. 



55157 



85157 



23 



23 



22 



22 



25 



25 



16 



16 



16 



.56109 



56109 



32 



32 



33 



33 



34 



34 



6 



6 



27 



27 



20 



20 



53280 



53280 



49019 



Butter 



38.5 

 38.5 

 37.7 

 37.6 

 38.4 

 38.4 

 37.7 

 37.7 

 40.3 

 40.3 

 40.3 

 40.1 

 40.1 

 38.3 

 38.3 

 39.3 

 39.3 

 38.9 

 38.9 

 40.6 

 40.5 

 36.3 

 36.3 

 39.0 

 39.1 

 42.2 

 42.2 

 37.6 



154.0 

 154.0 

 150.8 

 150.4 

 153.6 

 153.6 

 150.8 

 150. 8 

 161.2 

 161.2 

 161.2 

 160.4 

 160.4 

 153.2 

 153.2 

 157.2 

 157.2 

 155.6 

 155.6 

 162.4 

 162.0 

 145.2 

 145.2 

 156.0 

 166.4 

 168.6 

 168.8 

 1.50.4 



49019 

 14 

 14 

 14 



2 



2 



2 



4 



4 



3 



3 



3 



3 



31 



31 



28 



28 



17 



17 



18 



18 



19 



19 



29 



29 



Lard 



37.6 

 37.8 

 36.5 

 37.3 

 39.7 

 39.8 

 38.9 

 38.9 

 36.2 

 37.6 

 37.7 

 37.5 

 37.5 

 37.5 

 37.2 

 37.2 

 37.3 

 37.3 

 35.5 

 35.5 

 39.6 

 39.6 

 36.2 

 36.2 

 36.2 

 36.2 

 38.3 

 38.6 



150.4 

 149.6 

 146.0 

 149.2 

 158.8 

 169.2 

 155.6 

 155.6 

 144.8 

 150.4 

 150.8 

 150. 

 150.0 

 150.0 

 1'18.8 

 148.8 

 149.2 

 149.2 

 142.0 

 142.0 

 158.4 

 158.4 

 144.8 

 144.8 

 144.8 

 144.8 

 153.2 

 154.4 



do 



do_ 



do_. 



Cacao butter 



do _ 



do 



do. 



_ do - 



do 



do 



Olive oil ., 



Coconut oil (rancid )- 

 do 



do 



do 



do 



do 



do 



Coconut oil (refined) _ 



Coconut oil 



do 



do 



do 



do 



do 





do 



Pili-nut oil 





do. 



Castor oil __ 



do 



do 





Imitation butter 



do 



do 



Lard 



Distilled water 



do." - . 



do 



do 





The various fats and oils require different amounts of oxygen for 

 their complete oxidation to carbon dioxide and water. The glycerol 

 esters of four of the most commonly occurring fatty acids and glycerol 

 itself would have theoreticall}' the following oxygen numbers. 



"The so-called oxygen equivalent is the grams of oxygen times 100 required 

 for 1 gram of fat. 



"Different solutions of especially purified potassium permanganate were used 

 to titrate some of the duplicates. Many other determinations, uniform with these 

 and not recorded here, were made. 



