IAEA Reference Materials
Reference
Sheets
IAEA-V-9
TRACE ELEMENTS IN COTTON CELLULOSE
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
A
batch of approximately 50 kg of cotton cellulose powder was homogenized at
the Agency's Laboratories Seibersdorf. The material was homogenized in a rotating
plastic drum for 70 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:
March 1983
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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-V-9(.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 1981.
The details concerning the criteria for qualification as a recommended value
can be found in the report (IAEA/RL/97) "Report on the Intercomparison V-9
of the Determination of Trace Elements in Cotton Cellulose" [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 (K, Mg, Cu and Zn) by atomic absorption analysis.
A number of sub-samples (500 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,
500 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 500 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
