IAEA Reference Materials
Reference
Sheets
Intended
Use
This
sample is intended to be used as a reference material for the determination
of chlorinated compounds and petroleum hydrocarbons in fish 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
A
large batch of fish powder was received from an aquaculture farm for use as
an intercomparison material. This material was received already freeze-dried
and ground. It was further sieved through a 250 µm stainless steel sieve.
The fish powder fraction of particle size less than 250 µm was further
homogenized by mixing in a rotating drum for two weeks. Then, aliquots of
about 35 grams were packaged into glass bottles with aluminium screw caps
and sealed with Teflon tape.
Date of Release:
November 2000
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Unit Price:
90 €
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Unit Size:
35 g
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| Producer:
Marine Environment Laboratory (MEL) International Atomic Energy Agency B.P. No 800 MC-98012 Monaco |
Supplier:
Analytical Quality Control Services Agency's Laboratories, Seibersdorf A-2444 Seibersdorf, Austria |
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Reference Sheet: |
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Chlorinated
pesticides |
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Hydrocarbons |
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PCBs |
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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 organized in 2000. The details concerning the criteria for qualification
as a recommended or information value can be found in the report (IAEA/AL/125;
IAEA/MEL/69), “World-wide and Regional Intercomparison for Determination
of Organochlorine Compounds and Petroleum Hydrocarbons in Fish Homogenate
IAEA-406” [1]. This report is available free of charge upon request.
Homogeneity
The homogeneity of the material for organochlorine compounds and petroleum
hydrocarbons was checked by determining the concentration of some compounds
(chlorinated pesticides and petroleum hydrocarbons) in 10 replicate analyses
taken randomly in the bulk of the powder. A one-way variance analysis indicated
that the material could be considered homogeneous.
Dry weight determination
The
moisture content of the lyophilized sample as determined by drying to a constant
weight at 105°C, was found to be 11 %. Since the moisture content can
change with the ambient humidity and temperature, it is recommended that the
water content of this material always be determined in a separate sub-sample
(not that taken for analysis) by drying to a constant weight (~24 hours) at
105°C. Results should always be reported on a dry weight basis.
Instructions
for use
The
recommended sample size for analysis is 2 g for petroleum hydrocarbons and
5 g for organochlorine pesticides and PCBs. Analyst are reminded to take appropriate
precautions in order to avoid contamination of the material during handling.
The material should be stored in the dark and kept in a refrigerator.
References:
| [1] |
Last updated 30 March 2004
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