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A Neutron Activation Method for Determining Submicrogram Selenium in Forage Grasses¹

ABSTRACT

Neutron activation as a method for the analysis of submicrogram amounts of Se in fescue and orchard leaves was evaluated. It was observed that the Se content of National Bureau of Standards orchard leaves was 0.078 ppm compared with the NBS reported value of 0.080 ppm Se. The relative standard deviation for the orchard leaves was found to be 5.3%.

Following irradiation and nitric-perchloric acid digestion, Se was extracted from a 4M HBr solution using benzene containing 1% phenol. The method is sufficiently sensitive to measure with accuracy 0.010 ppm Se in 0.250 g of material. The method is straightforward and accurate and requires the extraction of Se in benzene which is completely free of phosphorus.

¹ Contribution from Missouri Agric. Exp. Stn., Missouri Journal Ser. no. 7740.

² Research Assistant and Professor, Dep. of Agronomy, Univ. of Missouri, Columbia, MO 65201.

Received for publication June 20, 1977. Accepted for publication October 5, 1977.