Table 2.
Americium concentration ratios for plants grow in potted soils
(from Plant Panel, 1976).
—
Range of CR's
+ Lime
Plant
Soil
+
Lime
+
DTPA
and
DTPA
Conditions
Rapporteur
oF
Pot culture
Corn
Soil pH = 6
10?
19?
Soil il pH
10 “4
10 °
=
8.5]
8.
Soil pH = 7.5;
Soil pk = 6
10 !
|10?
chelate applied
to soil.
10°
10°
Bush bean
Sand texture
Clay texture
Corn
Sand texture
Clay texture
10!
Wallace
10
107?
—
10°
-
_
_
10
_
10'
10!
10 +
10?
10
10 '
10?
10)1
10
chelate added
10°
Adriano
to Am stock
10°
~h
tors
Contaminated soil
from NTS areas 11,
13; 3 kg pot.
Alfalfa
10“ to 10?
Am-sol'n added to
.
_
10°° to io >
In 3 kg NTS soil; 0.6
nCi g! soil; highest
CR's involve chelate
Soybean
Forage
Bean
0.01 lower
\,
Barley
0.02 to 0.01 lower
|
Condition
~~
Rapporteur
Pot culture
Romney
Pot culture
Schulz
0.01 to 0.001 lower
Pot culture
Wildung
Field lysimeter
Cline
Garden plot
Dahlman
Field crop
Adriano
Peas
2 Ci en's
107 to 10°
Grain
0.01 to 9.001 lower
Barley
Soybean
Wheat grain
Barley
Straw
Seed-fruit CR's
relative to leaf-stem
Barley
Barley
cea
Plant
Soybean
10!
107!
-
Difference factors of Pu concentration ratio for leaf-stem versus
seed-fruit (from Plant Panel, 1976).
10 net g7};
-
Bush bean
Soil pH = 7
In addition to gross uptake and translocation of plutonium, the relative
concentration in fruit versus vegetation was examined by the Panel (Table 3).
From the various data presented, it appeared that the fruits tended to be
much lower in plutonium than the foliage, with the range of relative concentration of plutonium in the fruit being 0.5 to 0.001 of that of the plant
foliage.
Table 3.
Barley
-
Upon inspection of the rather limited comparative data presented, it
appeared to the Panel that americium is taken up by plants about 100 to
1000 times more readily than is plutonium.
Also, the data indicate that
the presence of complexing agents such as chelates could well influence
plant root uptake and translocation of both plutonium and americium.
Barley
0.01 lower
Cheatgrasa
Bush bean
0.1 lower
|
Millet
0.5 lower
|
Wheat
0.1 lower
? Schulz
INFLUENCE OF SOURCE CHARACTERISTICS
soils; 3 kg pot 7
10 * to 103
A group of investigators (Adams et al., 1975) studied uptake of plutonium
from ?3®Pu0, microspheres. The microspheres were 100 Um particles, which
treatment.
-
s Romney
10°? to 10!
In 3 kg NTS soil; 5 nCi
10" to 10 ?
are in the fine sand range and have relatively little surface area. The
plutonium concentration ratios found in this study were in the order of
107? to 10-7. These concentration ratios were based on plant ash weight
and therefore would be about a factor of 10 lower if based on the more
usual dry plant weight. This group of investigators also found that
g ' soil; highest
CR's involved chelate
treatment.
}
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