Abstract
A simple method for indirect complexometric estimation of boron has been worked out in which boron is precipitated as barium-boro-tartrate at pH 10.0 with excess barium and tartrateions and the excess barium is directly titrated at a temperature below 20°C with EDTA using a sensitive mixed indicator comprising Eriochrome Black T, Titan yellow and Naphtholgreen 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 but presence of higher amounts of these ions cause positive error due to precipitation of respective barium salts. The interference can, however, be avoided 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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