Bulletin - Bureau of Chemistry Volume 41-47 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1894 Excerpt: ...of Agriculture, pages 150-152. He states that the work in nitrogen is most accurate, but that he can not agree with the unoffic ial chemists who persist in using dilute HC1 for the absorption of ammonia and then simply evaporate and weigh the resultant N114C1--a method still followed. In the case of phosphoric acid the results for 1888-'92 are given. The author notes that the association seems to progress backward, but only apparently, since in earlier years the samples were mainly rock goods, while latterly they are more complex. The discrepancies in moisture results are attributed to carelessness ( ). In view of the proposition of Gibson (Proceedings for I860, p. 170) to change the official citrate solution to one slightly alkaline, the author states that he liuds them to produce no different results applied to rock goods. Other tests also iudicated that an increase of citric acid by 33 per cent made little difference upon the solubility of such goods--less than 0.3 per cent. Neutral citrate, kept for two years in a dark closet in closely stoppered bottles, was found not to have departed from neutrality. The addition of salicylic acid (0.1 gram to 2 liters) is found to prevent molding, without changing solvent action of the citrate. He does not hesitate to say that if the official methods were carefully executed by a competent analyst, such discrepancies' as the reporters have shown would not be possible, even in the case of iron and alumina phosphate. These differences exert serious influence upon the fertilizer trade, as is apparent when the reaultant difference in valuation is considered. Jour. Frank. lust.. 134, 450-467. w. p. 2. Official Methods Of German Experiment Stations.--Landw.Vers.-Stat., 42, 97-178; Exp. Sta. Record, 4, No. 11. ' PHOSPHORIC ...