Spectrophotometric Determination of Microamount of Boron in Iron and Steel by Solvent Extraction

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The microamount of boron in iron and steel was determined rapidly by a solvent extraction method. The sample was dissolved with sulfuric acid and hydrogen peroxide in a soft glass test tube. After boiling out the excess hydrogen peroxide by gentle heating, the solution was filtered through filter paper into a polyethylene separating funnel. Hydrofluoric acid was then added and the filtrate was allowed to stand for an hour at room temperature. Next methylene blue solution was added, the solution was extracted with dichloroethane, and the soluble boron was determined by measuring the absorbance of organic layer at 660 mμ against dichloroethane. The residue in the filter paper was ashed and fused with anhydrous sodium carbonate in a platinum crucible. The content was dissolved with sulfuric acid, transferred to a polyethylene separating funnel, and the spectrophotometric determination of insoluble boron was carried out with the same procedure as in the case of the soluble boron after addition of hydrofluoric acid. Other common constituents of iron and steel did not interfere with the procedure. The time required for this method was two hours.
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