New York Agricultural Experiment Station 283 



Table IV.— Separation of Forms of Phosphorus using Minimum 

 Amounts of Nitric Acid — {Continued), 



These resi.lts clearly show that where the amount of nitric acid 

 used in the determination of inorganic phosphorus was reduced 

 to the minimum, there was a marked decrease in the amount of 

 this form of phosphorus apparently present. This decrease is 

 especially noticeable in the hydrochloric acid extracts. In fact 

 the estimations by the use of hydrochloric acid, with the excep- 

 tions of alfalfa and linseed meal, we regard as indicating the ab- 

 sence of inorganic phosphates. The water and acetic acid 

 extracts on bran and malt sprouts show considerably higher 

 figures for inorganic phosphorus than the hydrochloric acid ex- 

 tracts. It will be observed that both these materials are rich in 

 easily soluble organic combinations. That these combinations are 

 more easily split up into inorganic forms by water alone and a 

 I per ct. acetic acid than by 0.2 per ct. hydrochloric acid seems 

 a possible explanation of the results secured. Even when bran 

 has been extracted with a i per ct. solution of hydrochloric 



