Soil Sample Elemental Analysis by Micro-Dumas Combustion
Last revised July 22, 1997
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[Overview of technique]
[Sample prep considerations]
Overview of technique
Sample prep considerations
Micro-Dumas combustion analysis for total carbon and total
nitrogen in solid-phase samples (plant tissue, soils, sediments,
etc.) is based on transformation to gas phase by extremely rapid and
complete flash combustion of the sample material. A great meany more
details of the process are available in the [Process Overview] document.
Soil samples must be oven-dried, ball-milled to less than 250 um
particle size, and weighed (25-30 mg, with ug digits significant)
into 5 x 5 mm tin capsules before combustion. Poor precision can
often be traced to inadequate grinding that leaves visible granules
in the sample. Sample prep for total-C/total-N analysis is set out
in excruciating detail in the
[Sample Collection] instructions.
Clients may send us unprocessed soil samples, or may provide any of
the above processing themselves at a major reduction in price.
Please refer to the [Fee Schedule]