Spectrophotometric Determination of Boron in Cobalt and Nickel Coatings by use of Carminic Acid.
Abstract
A method is proposed for the determination of boron in cobalt and nickel coatings deposited from borane-type baths by electroless techniques. In the method, the deposit is dissolved in hydrochloric acid in the presence of platinum chloride as a catalyst, potassium chloride and mannitol are added, and the solution is evaporated to dryness. Methyl alcohol is then added, the boron is distilled as methyl borate into sodium hydroxide solution, the distillate is evaporated to dryness, and the boron is determined spectrophotometrically using carminic acid. The mannitol prevents loss of boron by volatilization when the solution is evaporated to dryness. The advantage of evaporating the hydrochloric acid solution to dryness is that such treatment eliminates excess acid and water, both of which cause imcomplete recovery of boron in the distillation. The potassium chloride, cobalt chloride, and nickel chloride left after the evaporation to dryness dissolve in the hot methyl alcohol during the distillation and do not interfere. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 01, 1976
- Accession Number
- ADA037344
Entities
People
- George Norwitz
- Herman Gordon
Organizations
- Frankford Arsenal