IAEA Reference Materials
Reference
Sheets
IAEA-140/OC
ORGANOCHLORINE COMPOUNDS AND PETROLEUM HYDROCARBONS
IN
SEAWEED (Fucus sp.)
Intended
Use
This
sample is intended to be used as a reference material for the measurement
of organochlorine compounds and petroleum hydrocarbons in sea plants. 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
common brown seaweed, Fucus sp., was selected as sample material and
a large quantity was obtained on the coast of Normandy, France, through a
local supplier. The Fucus sample was freeze-dried under vacuum and
then micronized. About 15 kg of powder with a particle size of less than 40
µm was prepared. The powder was further homogenized by mixing in a stainless
steel rotating drum for 2 weeks. After checking for the homogeneity of the
sample material (see below), aliquots of about 35 g were packed into glass
bottles with Teflon lined screw caps and sealed with Teflon tape.
Date of Release:
March 1997
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Unit Price:
130 €
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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:  IAEA-140/OC(.pdf) |
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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 conducted between 1996 - 1997. The details concerning the criteria
for qualification as a recommended or information value can be found in the
report (IAEA/AL/140; IAEA/MEL/63), "World-wide and Regional Intercomparison
for Determination of Organochlorine Compounds and Petroleum Hydrocarbons in
Fucus Sample IAEA-140" [1]. This report is available free of charge upon request.
Homogeneity
The homogeneity of the material was assessed by determining the concentrations
of some chlorinated pesticides and petroleum hydrocarbons in ten samples taken
at random from the bulk material. A one-way analysis of variance indicated
that material could be considered as homogeneous.
Dry weight determination
The
moisture content of the lyophilized material as determined by drying to a
constant weight at 105°C, was found to be 13 ± 1 %. Since the moisture
content can change with the ambient humidity and temperature, it is recommended
that the water content of this material should 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 5 g for petroleum hydrocarbons and
10 g for organochlorines respectively. Analysts 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
