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Silicon Concentrations of Biological Standards

Agronomy Dep., Louisiana State Univ. Agricultural Center, Baton Rouge, LA 70803-2110

*Corresponding author (bell{at}lanmail.ocs.lsu.edu)

ABSTRACT

No NIST (National Institutes Standards Technology) standards for the Si concentration of biological materials are available, although Si has been determined for one NIST material by non-NIST personnel. We determined the Si concentrations of NIST materials and a proposed rice-straw (Oryza sativa L.) standard using an autoclave-induced digestion, colorimetric method. We measured 1410 mg Si kg^–1 for NIST material no. 1575, which was not significantly different from five of seven analyses reported in the literature (P < 0.05). Silicon concentrations of NIST and other materials were 2160 mg kg^–1 (no. 1547), 1500 mg kg^–1 (no. 1515), 1920 mg kg^–1 (no. 8412), and 69 300 mg kg^–1 (rice straw).

Approved for publication by the director of the Louisiana Agric. Exp. Stn. as manuscript no. 96-09-0099.

Received for publication March 27, 1996.