IAEA Reference Materials
Reference
Sheets
IAEA-V-10
TRACE ELEMENTS IN HAY POWDER
Intended
Use
This
sample is intended to be used as a reference material for the measurement
of trace elements in vegetation samples. The material 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
material, lucerne hay (Medicago satira), was grown on calcareous soil
at Churn, Berkshire, UK, by the University of Reading. About 75 kg of the
ground hay material was supplied to the Agency’s Laboratories, Seibersdorf,
by Dr. H. M. J. Bowen of the University of Reading (UK) and subjected to further
processing.
The product was ground to pass 125 µm sieve and thoroughly
mixed in a rotating plastic drum for 70 hours. The material was then bottled
into plastic containers each containing approximately 50 g at the Agency’s
Laboratories, Seibersdorf. 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 1985
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Unit Price:
90 €
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Unit Size:
50 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-V-10(.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 median 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 1984. The details concerning the criteria for qualification
as a recommended value can be found in the report (IAEA/RL/123) "Report on
the Intercomparison V-10 of the Determination of Trace Elements in Hay Powder"
[1]. This report is available free of charge upon request.
Homogeneity
The
homogeneity was evaluated by determining the content of six marker elements
(Co, Cr, Cs, Fe, Sr and Zn) by non-destructive analysis using instrumental
neutron activation analysis (INAA) in single samples (100 mg) taken from twelve
bottles, selected at random. A statistical analysis of the results using F
and t-tests indicated that the 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
