major constituents; the elements Fe, 41, Cu, Si and Br were designated
as minor constituents on the basis of analysis of the background com-
ponents (coral and lagoon sea water).
TABLE 3.13 - Summary of Analytical Methods
Element
Reagent
Cl
Na
K
Mg
Ca
Sr
Mohr Titration Method
Beckman Flame Photometer
Beckman Flame Photometer
Beckman Flame Photometer
Beckman Flame Photometer
Beckman Flame Photometer
Al
Cu
Si
Br
Beckman
Beckman
Beckman
Beckman
Fe
(a)
Me thod(@)
Beckman Spectrophotometer
Spectrophotometer
Spectrophotometer
Spectrophotometer
Spectrophotometer
Silver nitrate
-
Dipyridyl
Aluminon
Diethyldithiocarbamate
Reduced Silicomolybdate
Fluorescien-eosin
Application of Analytical Methods to the Analysis of
Fallout Material, USNRDL Technical Report in preparation
TABLE 3.14 - Spectrophotometric Analysis of Minor Constituents
Element Solvent
rH
Medium |Permissible
Range
Fe
Al
Cu
Si
Br
H0
H20
CCl,
B20
H20
Used
320 - 9.0
4.0 - 7.5
5.7
hed
5.0 - 9.0
(for exe
traction)
he2 = 6.8
-
5.7
4.54.0]
5.7
Wave Length of
|Max. Absorption
(mu)
520
535
Optimum Amount
of Sample
Liquid
Solid
(m1)
> 100
10
435 (in CCl,) |>100
820 (used 700)|
517
10 - 100
<1
(mg)
1M = 50
id = 25
P.O0=500
10
-
The elements Fe, Cu, and Si were characterized by very stable ,
complexes ideally suited for analytical purposes. However, the Si proce~
dure gave soluble Si only. The Al ami Br procedures were sensitive to
pl and salt concentration. Solutions of Al and Cu could be concentrated
without increasing interferences from other elements to any great extent -
the Al being carried on Fe(0H)3 and Cu being extracted into CCl, as the
diethyldithiocarbamate complex.
60