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Determination of Arsenic in Flue-Cured Tobacco and in Soils¹

ABSTRACT

Procedures are described for the semimicro analysis for arsenic in flue-cured tobacco and in soils. The plant material is digested with a mixture of nitric, sulfuric and perchloric acids and the soil with sulfuric and perchloric acids. Arsenic is distilled directly from the digestion flask, absorbed in an iodine solution and determined colorimetrically by the molybdenum-blue method.

The data show that good recovery of arsenic and reproducibility of results were obtained with the described procedures. The acid digestion method for plant material gave results which were comparable to those obtained by oxidation in an oxygen bomb. The evidence from soils indicates that the digestion and distillation procedure employed removed essentially all of the arsenic.

¹ Contribution from the Department of Soils, North Carolina Agr. Exp. Sta., Raleigh. Published with the approval of the Director as paper No. 1248 of the Journal Series. This study was supported by a grant from the Tobacco Industry Research Committee.

² Formerly Graduate Assistant and Associate Professor, respectively.

Received for publication December 9, 1960. Accepted for publication May 18, 1961.