Abstract
A method for colorimetric determination of a small amount of manganese in metallic nickel is investigated. The sample is dissolved in nitric acid, a minute amount of manganese is separated from nickel by coprecipitating with ferric hydroxide in ammonical solution, and determined colorimetrically by oxidation to permanganate using silver nitrate and ammonium persulfate in acidic solution. The effects of other impurities which may be present in metallic nickel are reported along with methods for preventing the interferences.A method for colorimetric determination of a small amount of silicon in metallic nickel is investigated by means of ammonium molybdate-amyl alcohol extraction. This paper deals with the results of studies of a simultaneous extraction of molybdosilicic acid, molybdophosphoric acid and molybdoarsenic acid from the nickel solution into amyl alcohol, and the extraction of only molybdosilicic acid from amyl alcohol into sodium hydroxide-boric acid buffer solution. Optimum conditions of reagent concentration, acidity for coloring and extraction, and the temperature and alkalinity of buffer solution are determined. Interferences with other impurities that may be present in nickel are shown to be negligible. The minimum limit of quantitative estimation of silicon is 0.0002%.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
