8
in Tables 1 and 2 are, for almost all the different algal
samples, averages of replicate determinations on the
same large (20 g} sample for radium and calcium,
tion of the product of low temperature oxidation
nitric or hydrochloric acid. These residues were four
to be soluble in hydrofluoric acid and were, therefor
in all probability hydrated silicates. This residue w:
filtered off and weighed. All analytical results ha.
been normalized to the soluble weight, and the fra:
tion of each sample which dissolved is shown show
in Table 1. The insoluble residue generally account«
for less than 10% of the gross weight; for most of tl
and on different small (< 1 g} samples for total or-
ganic content, nitrogen and the neutron activation
analysis experiments, which generally were in agreement to better than + 10%.
In almost all of the algal samples an insoluble offwhite residue remained after wet oxidation or dissoluTABLE 2.
ANALYSIS OF WATER, SAND, AND THREB SPECIES OF ALGAE COLLECTED FROM THREE DIFFERENT LOCATIONS
Location
Cajo Margarita (9)
Material
Soluble
Water
Sand
Halimeda opuntia
Penicillus capttatus
1.00
0.984
0.978
0.970
Padina gymnespora
Cabo Rojo (10)
Punta Arenas (12)
oie
pie
uelfs
Ra/Ca
U/Ca
3.9 X 107*
0.30
0.31
0.23
7.2 * 10%
0.039
0.073
0.034
(3 &K 190°
1.68
1.62
1.70
0.18
0.13
0.24
0.15
7.6
5.3
5.2
7.4
—
-
—
_—
_
_—
Water
Sand
Halimeda opuntia
Penictllus capitatus
1.60
6.780
0.973
0.928
4.4 104
0.32
0.31
0.28
1.38 & 104
0.072
0.045
0.060
13 X 107 @
1.08
1.48
1.69
0,29
0.22
0.15
0.21
6.8
3.4
4.8
5.9
Padina gymnospora
0.938
0.15
0.067
0.64
0.44
4.2
Water
Sand
Halimeda opuntia
Penictllus capitatus
Padina gymnospora
1.00
0.554
0.956
0.852
0.836
3.5 x 1074
0.25
0.29
0.28
0.19
4.1 * 1075
0.086
0.08
6.080
0.060
3 & 103 @
0.59
1.46
1.65
0.70
0.12
0.34
0.37
0.29
0.31
8.7
2.4
5.0
6.0
3.6
{s)} From Ref. 15.
TABLE 3.
All algae
Correlation
Organic with
Nitrogen
Calcium)
Radium®)
Thorium®
Uranium)
Nitrogen with
Radium
Radium»)
Thorium
Uranium)
Caleium with
Nitrogen™
Nitrogen“)
Radium
Radium)
Thorium?
Uranium™
Uranium»?
() All data taken.
ReEsutts or REGRESSION ANALYSIS
Chlorophyta
Rhodophyta
Phaeophyta
R
if
P
R
t
P
R
ft
P
R
tT
P
0.57
—0.66
—0.23
—0.12
—0.77
64
63
64
33
62
0.001
0.001
—
—_
0.001
0.60
—0.57
—0.40
—0.15
—0.69
26
25
26
16
26
0.001
0.005
0.05
—
0.001
0.15
—0.42
—0.17
—0.67
—~0.73
23
23
23
8
22
—
0.05
—
—
0.001
0.65
—0.51
—0.09
— 0.60
—0.73
15
15
15
9
14
0.01
0.05
_
—
0.005
—0.09
—0.14
— 6.09
—0.54
69
56
33
62
—
—
—
0.001
—0.19
—0.18
27
22
—
—
—0.06
—0.19
24
19
—
—
0.43
0.69
18
15
0.10
0.005
—0.46
26
_
—90.34
22
—
0.29
14
—_
—0,69
—0.69
—0.10
—0.02
—0,22
0.76
0.77
67
55
67
54
32
61
50
0.001
0.001
—
—
—0.56
—0.67
—0.17
—0.08
25
21
25
2]
0.005
0.001
_
—
—0.65
—0.60
0.19
0.51
24
19
24
19
0.001
0.01
—
0.001
0.80
0.82
—0.40
—0.81
18
15
18
15
0.001
0.001
—
0.001
0.001
0.001
0.77
0.83
25
21
0.001
0.001
0.56
0.62
22
18
0.01
0.05
0.50
0.31
14
12
0.10
_—
|
(b) Selected data. Individual data point dropped if KX — 3¢ < X > X + 3e for each species.