TABLE 26b

TRITIUM ACCUMULATION IN AQUATIC ORGANISMS -- PART II
GROWTH OF THE ALGA Scenesdmus obliquus ON LIQUID EFFLUENTS
CONTAINING TRITIUM FROM NUCLEAR FACILITIES

    I     II     III
Effluent source

    

Initial tritium in
culture medium        
(nCi/mL)
Tritium in
water of dry tissue
(ÁCi/mL)
Combustion R
(II/I)
Radiochemical Lab
Radiochemical Lab
Radiochemical Lab
52
76.5
70.3
1.41
4.10
3.08
27.1
53.6
43.8
Nuclear Power Plant
SEMO    
SENA    
5.1
16.6
4.60
14.5
0.90
0.87
Notes :    (1) Location: Brussels, Belgium.
    (2) Exposure time of algae: 12-42 days
    (3) Distribution of tissue bound tritium (TBT) in organismal compartments: lipids, pigments and fatty acids, 58.3%; ether-soluble substances, ND (not detected); free amino acids and carbohydrates, 1.1%; protein hydrosylate, 34%; residue material, 6.6%. Nucleic acids contain more radioactively labeled hydrogens than lipids and lipid fractions. Ratios of activity in nucleic acid to lipid to lipid fraction, when referred back to the tritium content of the algal medium is 1.13:0.56:0.44.
    (4) Nuclear effluents were filtered on Millipore (0.45 Ám) before mixing with culture medium.
    (5) The specific activity ratios for the effluents from two nuclear power plants (known as SEMO and SENA) suggest, according to the reference, an absence of biologically bound tritium in the filtered effluents. Radioactivity was reported from the filtered residue suggesting the uptake of tritium by microorganisms.
    (6) Reference: adapted from Kirchmann et al (1979), especially Tables I and VI.

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