Reference Sheet - Trace Elements And Methylmercury In Estuarine Sediment - 2000 Page 2
ADVERTISEMENT
1
2
3
4Information Values
(Based on dry weight)
Information Value
95% Confidence Interval
Analyte
N*
[mg/kg]
[mg/kg]
Al
77900
72700 – 83100
37
Br
85
60 – 110
4
Cs
12.5
10.4 – 14.6
4
Eu
1.25
0.89 – 1.61
5
Hf
5.80
4.93 – 6.67
3
K
24900
17700 – 32100
5
La
40.4
33.1 – 47.7
5
Lu
0.468
0.283 – 0.653
3
Sc
13.52
11.53 – 15.51
3
Sm
6.86
6.50 – 7.22
4
Sr
118
104 – 132
28
Tb
0.93
0.50 – 1.36
3
Th
14.3
12.2 – 16.4
5
U
3.01
1.86 – 4.16
5
Yb
3.04
2.19 – 3.89
4
*
Number of accepted laboratory results which were used to calculate the information values and confidence
intervals about the mean value
The values listed above were established on the basis of statistically and technically valid
results submitted by laboratories which had participated in an international intercomparison
exercise organized in 1998. The details concerning the criteria for qualification as a recommended
or information value can be found in the report (IAEA/AL/127; IAEA/MEL/70), “Report on the
World-wide Intercomparison Exercise for the Determination of Trace Elements and
Methylmercury in Estuarine Sediment IAEA-405” [1]. This report is available free of charge upon
request.
Intended Use
This material is intended to be used as a reference material for the measurement of trace
elements and methylmercury (MeHg) in coastal sediments. It can also be used as a quality control
material for the assessment of analytical procedures, in the elaboration and validation of analytical
methods, and for educational purposes.
Origin and preparation of the material
A large quantity of sediment was collected in 1998 from the intertidal mudflats of the Tagus
estuary (Portugal) for use as an intercomparison material. It was deep-frozen, freeze-dried, ground
and sieved. The sediment fraction of particle size less than 150 µm was further homogenized by
mixing in a stainless steel rotating drum for two weeks. After checking for the homogeneity of the
sample material (see below), aliquots of about 35g were packed into cleaned brown borosilicate
glass bottles with Teflon lined screw caps and sealed in plastic bags. A total of 530 bottles was
produced.
Page 2 of 4
ADVERTISEMENT
0 votes
Related Articles
Related forms
Related Categories
Parent category: Education