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183 



amostra e pelo processo seguido é certo que 

 a parte dissolvida consistiu quasi exclusi- 

 vamente de kamasite. A proporção achada 

 de nickel e cobalto reunidos (7. 15%) pouco 

 diffère da achada pelo Dr. Dafert para o 

 kamasite escolhido (6.83 7o) e da compo- 

 sição theorica conforme a formula FonNi 

 (6.89 7o). 



A precipitação do cobre foi feita coin toda 

 a solução por meio de acido sulphydrico. 

 Obteve-se 0.008 gr. = 0.004o % Cu. 



Para a determinação do nickel e cobalto 

 el.evou-se o volume do liquido a 1 litros, 

 dos quaes se tomou 100 co. que de novo 

 foram elevados ao volume de um litro. 

 Desta solução tomou-seemfim 100 cc. para 

 a analyse. Como a solução total continha 

 176.294 gr. correspondem aquelles 100 cc. 

 a 0.4407 gr. de material. 



Tendo-se executado a separação do nickel 

 com o cobalto o pesado-os juntos depois de 

 reduzidos a metaes, proseguiu-se â sepa- 

 ração dos dous metaes por meio de nitrito 

 de potassa. O cobalto foi precipitado duas 

 vezes por meio desse sal, para obtel-o com- 

 pletamente livre do nickel, e depois dissol- 

 vido em acido chlorlijdrico, precipitado de 

 novo com potassa, reduzido a metal e final- 

 mente pesado. Obteve-se: 



From the aspect of the specimen and from 

 the process followed, it is certain that the 

 dissolved portion consists almost exclusi- 

 vely of kamasite. The proportion found of 

 nickel and cobalt together (7.15 7o) dif- 

 fers but little from that found by Dr. Da- 

 fert for selected grains of kamasite (6. 837o) 

 and from the theoretical composition accor- 

 ding to the formula Fe,iNi (6.89 7o). 



Copper was precipitated from the whole 

 solution by sulpliydric acid. 0.008 grms. 

 were obtained corresponding to 0.0045 7o- 



For the determination of nickel and 

 cobalt the volume of the liquid was raised 

 to 4 litres of which 100 cc. were taken 

 which were again raised to the volume of a 

 litre. Of this solution lOOcc. were taken for 

 analysis. As the total solution contained 

 176. Í94 grms. the 100 cc. corresponded to 

 0.4407 grras. of material. The nickel and 

 cobalt having been separated and weighed 

 together in the metallic state, the two were 

 separated by means of nitrite of potash. 

 Cobalt was precipitated twice by means of 

 this salt in ovder to obtain it completely 

 free from nickel, dissolved in hydrochloric 

 acid, precipitated by potash, reduced to 

 metal and weighed. The result was : 



Ni 



Co 

 Co 



Ni 



7.15 



0.79 

 6.36 



Vo 



Emfim, examinou-se o gaz acima mencio- 

 nado, o qual foi recolhido afim de se veri- 

 ficar si elle continha carbono em forma 

 de algum hydrocarbureto que fosse origi- 

 nado pela acção do acido sobre o carbono 

 contido no ferro. 



Finally an examination was made of 

 the gas above mentioned which had been 

 collected with a view of determining if 

 it contained carbon in the form of a hy- 

 drocarbon formed by the action of the 

 acid on carbon contained in the iron. 



