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IAEA-392

Algae    
Organic   Vegetation

The IAEA-392 Algae material was prepared by the Analytical Quality Control Services of the International Atomic Energy Agency in co-operation with the Institute of Microbiology, Academy of Sciences of the Czech Republic in Trebon, during 1995. The IAEA-392 algae material (type: Scenedesmus obliquus 208) was produced under standard outdoor culture conditions. Mineral nutrients were prepared from p.a. chemicals and added as required to maintain the optimum balanced composition of the nutrient medium in the growing culture. After harvesting, the algae were stored in a coupled tank and continuously spray dried at moderate venting and temperature avoiding a damage of the cell structure. The bulk algae material and the sealed bottles were treated with gamma ray irradiation with a total dose of 25 kGy using a Co-60 source to improve long-term stability of the material by reducing microbial action.

AnalyteValueUnitExpanded
uncertainty U,
k=2
NR/I/C
As0.175mg/kg0.0164I
Ca2680mg/kg67.46R
Cd0.0173mg/kg0.00143I
Co3.33mg/kg0.1227I
Cr4.57mg/kg0.1807I
Cu23.2mg/kg1.746R
Fe497mg/kg13.68R
K8383mg/kg252.45I
Mg2376mg/kg78.84R
Mn67.5mg/kg1.545R
Na680mg/kg23.05R
Ni0.571mg/kg0.0284R
Pb0.574mg/kg0.0194R
Zn128mg/kg2.08R

(N) Number of accepted laboratory means which are used to calculate the recommended or information values and their respective confidence intervals 
(R/I/C) Classification assigned to the property value for analyte (Recommended/Information/Certified)

The values listed above were established on the basis of statistically valid results submitted by laboratories which had participated in one or more international interlaboratory comparisons organized by the Chemistry Unit, IAEA Laboratories, Seibersdorf. The details concerning the criteria for qualification as a recommended or information value can be found in the respective report (attached).


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