IAEA Reference Materials
Reference
Sheets
IAEA-Soil-7
TRACE ELEMENTS IN SOIL
Intended
Use
This
sample is intended to be used as a reference material for the measurement
of trace elements in soil samples. It can also be used as a quality control
material for the assessment of a laboratory's analytical work, for the validation
of analytical methods and for quality assurance within a laboratory.
Origin
and preparation of the material
The
soil sample (top soil to a depth of 10 cm) was collected near Ebensee in Upper
Austria at an altitude of 1100 m above sea level. The material was sieved
through a 1 cm sieve, then heated at 450°C for 24 hours to destroy organic
matter. After ashing, the sample was crushed, ground and milled to pass through
a 71 µm sieve. The material was thoroughly mixed in a rotating plastic
drum for 24 hours and then bottled into plastic containers each containing
approximately 25 g.
Date of Release:
May 1984
|
Unit Price:
90 €
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Unit Size:
25 g
|
| Producer:
Chemistry Unit Agency's Laboratories, Seibersdorf A-2444 Seibersdorf, Austria |
Supplier:
Analytical Quality Control Services Agency's Laboratories, Seibersdorf A-2444 Seibersdorf, Austria |
|
Reference Sheet:  IAEA-Soil-7(.pdf) |
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| * | Number
of accepted laboratory results which were used to calculate the recommended
or information values and their respective confidence intervals about
the mean value. |
| (R/I) | Classification assigned to the property value for Analyte (Recommended/Information) |
The values listed
above were established on the basis of statistically valid results submitted
by laboratories which had participated in an international intercomparison
exercise conducted in 1983. The details concerning the criteria for qualification
as a recommended value can be found in the report (IAEA/RL/112) "Report on
the Intercomparison Run IAEA-Soil-7: Trace Elements in Soil" [1]. This report
is available free of charge upon request.
Homogeneity
The
within and between bottle homogeneity was evaluated by determining the content
of four marker elements (Na, Fe, Sc and Sm) by instrumental neutron activation
analysis. A number of sub-samples (100 mg) was taken from a single bottle
and an equal number of single samples were taken from individual bottles selected
at random. A statistical analysis of the results using F and t-tests indicated
that the within and between bottle results did not differ significantly and
the material can therefore be considered homogeneous (at a sample intake mass
at, or above, 100 mg).
Dry
weight determination
All
values are expressed on a dry weight basis. Therefore the dry weight must
be determined at the time of analysis, using separate sub-samples of at least
500 mg dried to constant weight in a drying oven set to 105 °C. Subsequent
weighings should differ by less than 5 mg.
Instructions
for use
The
recommended minimum sample size for analysis is 100 mg. Analysts are reminded
to take appropriate precautions in order to avoid contaminating the remaining
material in the bottle. No special precautions are required for the storage
of this material.
References:
| [1] |
Last updated 30 March 2004
