||Analysis of Sulfur in Soil, Plant and Sediment Materials: Sample Handling and Use of an Automated Analyzer.
David, M. B. ;
Mithcell, M. J. ;
Aldcorn, D. ;
Harrison, R. B. ;
||Illinois Univ. at Urbana-Champaign. Dept. of Forestry. ;Washington Univ., Seattle. Coll. of Forest Resources. ;State Univ. of New York Coll. of Environmental Science and Forestry, Syracuse.;Corvallis Environmental Research Lab., OR.
Soil chemistry ;
Quantitative analysis ;
Soil tests ;
Freeze drying ;
||Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy.
Methods for analyzing soil, vegetation and sediment samples for total sulfur (S) and handling solid samples for analysis of S constituents were examined. A LECO automated total S analyzer (SC-132) was used for the analysis of vegetation, sediments and soil samples. Results from the LECO analyzer compared favorably with other currently used total S techniques such as alkaline oxidation. Calibrating the instrument on soil or vegetation standards using two combustion accelerators improved accuracy and recovery. The upper 99% confidence interval RSD values for duplicate samples using the LECO analyzer were <15% for mineral soil, <8% for forest floor and <3% for sediment samples. Sample analysis takes <3 min and provides a direct readout of the total S value. Freeze-drying soil samples caused minor changes (<15%) in S constituent analyses (Zn-HCl reduction, HI-S and extractable sulfate) when compared to fresh (field moist, refrigerated) samples. Oven-drying at 65 C caused greater changes in soils than freeze-drying, primarily in extractable sulfate. (Copyright (c) 1989 Pergamon Press.)