Distribution of Arsenic in Lodgepole Pines Treated with MSMA

Author： Maclauchlan L. E. Borden J. H. D'Auria J. M.

Publisher： Society of American Foresters

ISSN： 0885-6095

Source： Western Journal of Applied Forestry, Vol.3, Iss.2, 1988-04, pp. : 37-40

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Abstract

Fifteen mature lodgepole pines, Pinus contorta var. latifolia Engelmann, were treated with either 1/8-, ¼- or ½-strength monosodium methanearsonate (MSMA) applied to axe-frills around the base of the bole. Using X-ray fluorescence spectroscopy, we determined the arsenic concentration in the phloem, sapwood, and foliage of MSMA-treated and control trees. The highest accumulation of arsenic was in the phloem, near the point of application, and in the foliage. Residual arsenic concentration in the tissues of treated trees averaged <5 ppm above 2 m for all treatment strengths, a concentration probably too low to kill attacking bark beetles or their brood. In addition, the levels of MSMA in the bole tissues of treated trees is well below the 10% safety limit for sawmills stated by the British Columbia Workman's Compensation Board Industrial Health and Safety Regulations. West. J. Appl. For. 3(2):37-40, April 1988.