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Transactions of the INDIAN CERAMIC SOCIETY   Vol. 32  1973
Indirect Complexometric Estimation of Boron and Its Application in Glass, Enamel and other Ceramic Materials
B. C. SINHA AND S. K. RoY
Pages : 43-48
DOI : 10.1080/0371750X.1973.10840558
Abstract
A simple method for indirect comp/exometric estimation of boron has been worked out in which boron is precipitated as barium-bora-tartrate at pH 10.0 with excess barium and tartrate ions and the excess barium is directly titrated at a temperature below 20°C with EDT A using a sensitive mixed indicator comprising Eriochrome Black T, Titan yellow and Naphtha/green B. Small amounts of sulphate (5 mg), phosphate (5 mg), chromate (6 mg), silica (3 mg), aluminate (5 mg) and fluorine (10 mg) do not interfere hut presence of higher amounts of these ions cause positil·e error due to precipitation of respective barium salts. The interference can, howerer, be m·oided by precipitating them out with barium chloride prior to the precipitation of boron. The method has been successfully applied for the estimation of boron in glass and other complex silicate materials and the results agree well with the standard values.
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