Determination of surfactant ions by ion flotation

✍ Scribed by H.S. Tomlinson; F. Sebba

• Publisher: Elsevier Science
• Year: 1962
• Tongue: English
• Weight: 189 KB
• Volume: 27
• Category: Article
• ISSN: 0003-2670
• DOI: 10.1016/s0003-2670(00)88561-x

✦ Synopsis

GOBI~lUNICATIONS

up to IO mg of molybdenum(V1) (added as ammonium molybdate) could be present under these conditions but greater amounts gave a yellow colour at the end-point. Vanadium could be determined in the presence of manganese(I1) (Table ). Amounts up to 150 and zoo mg of potassium fluoride and diammonium hydrogen phosphate respectively did not interfere in the determination of 7.5-15 mg of vanadium. To overcome the interference of iron(III), added as ferric ammonium sulphate, several drops of dilute sulphuric acid were added to the solution followed by 2-3 ml,,+ of zo-vol hydrogen peroxide ; the solution was then diluted and iron was precipitated as ferric hydroxide with dilute ammonia solution. The precipitate was filtered off and the filtrate was boiled with sodium sulphite and titrated as described above. Results of such separations are shown in Table .