IAEA Reference Materials
Reference
Sheets
IAEA-SL-1
TRACE AND MINOR ELEMENTS IN LAKE SEDIMENT
Intended
Use
This
sample is intended to be used as a reference material for the measurement
of trace and minor elements in lake sediment 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
lake sediment material was collected and prepared by Drs. J.C. Richie and
C. Cooper (US Department of Agriculture, Agricultural Research Service, USDA
Sedimentation Laboratory, Oxford, Mississippi, USA) and donated to the Agency
by Dr. J.C. Ritchie. The sediment was collected at the Sardis Reservoir; Panola
County, Mississippi, USA (water depth: 15 m).
The material was dried in an oven at 50 °C over a seven day period then
ground and sieved. The fraction of the material which passed through a 0.1mm
sieve (ca. 60 Kg) was collected and sent to the Agency for further processing.
The material was thoroughly mixed at the Agency’s Laboratory by rotating
it in a plastic drum for 60 hours before it was dispensed into plastic bottles.
Each bottle contained approximately 25 g of the material.
Date of Release:
December 1979
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Unit Price:
90 €
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Unit Size:
25 g
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| Producer:
Chemistry Unit Agency's Laboratories, Seibersdorf A-2444 Seibersdorf, Austria |
Supplier:
Analytical Quality Control Services Agency's Laboratories, Seibersdorf A-2444 Seibersdorf, Austria |
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Reference Sheet:  IAEA-SL-1(.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 organized during 1977-1978. The details concerning the criteria for
qualification as a recommended or an information value can be found in the
report (IAEA/RL/64) "Intercomparison Run SL-1: Determination of Trace
and Minor Elements in Lake Sediment IAEA-SL-1" [1]. This report is available
free of charge upon request.
Homogeneity
The
within and between bottle homogeneity was evaluated by determining the content
of three marker elements (As, Cs and Sc) 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
recommended and information 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 500 mg dried to constant weight in a drying oven set to 105
°C. Subsequent weighings should differ by less than 5 mg.
The moisture content of the material was assessed at the time of bottling
and after a one year period of storage, by drying the material in an oven
at 105 °C to constant weight. The results indicated that the moisture
content had increased slightly from 2.7 % to 3.4% over this period.
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
