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A Modified Procedure for the Determination of Total Boron from Soil Fused with Sodium Carbonate¹

ABSTRACT

Total boron was extracted by 6N HCl and by 6N H₂SO₄ from a soil fused with Na₂CO₃. The amount of boron in the resulting extracts was determined directly. It was found that the H₂SO₄ extraction of soils interfered with the absorbance of the boron carmine complex resulting in high values of boron. No interferences were encountered with the HCl extracts. Further, the resulting extracts from HCl were easily filtered. The percentage recovery of the added boron from the investigated soils, when extracted by 6N HCl was good and the results were reproducible.

Heating 6N acid solutions for a period of 2 hr on a hot water bath at 100C resulted in no loss of boron. Carmine reagent was found to be stable for at least 18 days when stored in polyethylene bottles at room temperature.

¹ Contribution No. 150, Research Branch, Canada Dep. Agr., Experimental Farm, Charlottetown, Prince Edward Island, Can. Presented before Div. S-4, Soil Science Society of America, Aug. 25, 1966, at Stillwater, Okla.

² Research Soil Scientist, Canada Dep. Agr., Charlottetown.

Received for publication February 21, 1966. Accepted for publication June 13, 1966.