IAEA Reference Materials
Reference
Sheets
IAEA-SL-3
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 was collected from the Neusiedlersee, located some 80 km south-east
of Vienna, Austria. The material was collected directly from the top layer
of the sediment using a mud pump and then coarse particle were removed in
the field by passing the sediment through a 1 cm sieve.
After removal of the superficial water, the sediment material
still retained approximately 46% water by weight. The material was allowed
to air dry for one month before being dried in an oven at 400 °C for 24
hours. After drying, the material was milled to pass a 500 µm sieve.
This fraction was then passed through a 71 µm sieve and the collected
material was designated SL-3 and was used for this intercomparison study.
The material was thoroughly mixed in a rotating plastic drum for 48 hours
and then bottled into plastic containers each containing approximately 25
g. Finally, the samples were irradiated to a dose of 2.5 x 104
Gy using a 60Co source to ensure long-term stability of the material
by inhibiting microbial action.
Date of Release:
July 1987
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Unit Price:
110 US $
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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-3(.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 1986 - 1987. The details concerning the criteria
for qualification as a recommended or an information value can be found in
the report (IAEA/RL/143) "Report on the Intercomparison Run IAEA-SL-3: Trace
Elements in Lake Sediment" [1]. This report is available free of charge upon
request.
Homogeneity
The
homogeneity of the material was assessed by determining the concentration
of a number of elements (Ce, Th, Hf, Ba, Sc, Rb, Fe, Co) by instrumental neutron
activation analysis in ten sub-samples taken from the bulk sample at random.
It was found that the results did not differ significantly and therefore this
material could be considered homogeneous (at a sample intake mass at, or above,
150 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.
Instructions
for use
The
recommended minimum sample size for analysis is 150 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
