342
L. Pellerito . R. Barbieri· R. Di Stefano . M. Scopelliti . C. Pellerito . T. Fiore . F. Triolo
~~
0·~~ EO~
~~~
~;e
"'~ ...
I: 0 I:
en .... 0
0V; to v
cC 6,.=
~ "V;
~cC
.s~
o~
a
b
Inorganic salt medium
ZoBell medium
60
40
20
5
10
14 0
5
10
Incubation period (days)
Incubation period (days)
l 0 0 . n
Inorganic salt medium
80 1 \ Arsenocholine
60
2
l -' \. .-/"-~
Trimet~ylarsine
'5 ~
40
~
oXide \.
.0::
'" 0
li 15 20
~ ~!
La~
. , . - - DimethylarsinicaOd
~ ~o
0
~ ~ :::
0
5
10
15
20
25
30
enOl:
._ .... 0
111- u
cC"'l:
t5 'iii 100
x :li
,y Arsenocholine
c( 6,.f\ ZoBell medium
§ t5 80
Trimethylarsine
60
40
20
o
oxide
\.
o
5
10
15
20
25
30
Incubation period (days)
14
Fig. 1 S.3. Conversion of arsenocholine into metabolites during aerobic incubation at 25°C in an inorganic medium and a ZoBell medium added to the sediment collected; a in May 1990; b in July 1990,
adapted from Hanaoka et aI. (1992b)
gate their distribution and the cycle of the arsenic derivatives in the marine environment. In particular, during the cruises of the Shirase and Hakuho-maru ships as well
as of the tanker Japan Violet, the Indian Pacific Oceanic (Santosa et al. 1994) surface