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L. Pellerito . R. Barbieri· R. Di Stefano . M. Scopelliti . C. Pellerito . T. Fiore· F. Triolo
Table 15.3. Average concentration of monomethylarsonic acid (MMAA), dimethylarsinic acid (DMAA),
monomethylgermanium (MMGe) in the surface zone « 100 m) of three sampling stations in the Pacific Ocean, adapted from Santosa et aI. (1997)
Sampling station
Arsenic Species
(ng dm- 3 )
Germanium species
(ng dm- 3 )
Inorg.As
MMAA
DMAA
Inorg.Ge
MMGe
North-west Pacific (LM-6)
1483
11.8
47.7
2.5
15.9
Central north Pacific gyre (C)
1110
15.9
184.5
2.0
165
Central Pacific equatorial
1450
12.4
53.3
<0.7
15.8
Region (D2)
Table 15.4. Arsenic distribution in aqueous extracts of cells determined by HG GC AA (Ilg g-l, dry
weight), adapted from Cullen et aI. (1994)
Arsenic
Arsenic species Cells treated with 10 ppm
Cell treated with 0.9 ppm
exposed founds in cells arsenicals
arsenicals
A a
Bb
A a
Bb
Arsenate Arsenate
12.8 ±0.8
9.7 ±0.7
0
5.1 ±0.3
Arsenite
25.1 ±1.3
0
26.3 ±1.6
0
MMAA
0
0
0
0
DMAA
1.9 ±0.2
0
21.7 ±2.0
0
Total
39.8
9.7
48.0
5.1
Arsenite Arsenate
8.0 ±05
0
1.8±0.1
0
Arsenite
37.7 ±25
2.3 ±0.2
65 ±0.4
1.2 ±0.1
MMAA
3.1 ±0.2
0.4 ±0.03
1.0 ±0.1
0
DMAA
0.8±0.1
0.8±0.08
5.4 ±0.5
0.8±0.1
Total
49.6
35
14.7
2.0
MMAA
Arsenate
0
0.3 ±0.03
0
0
Arsenite
0
0.9±0.07
0
0
MMAA
5.3 ±0.3
0.8 ±0.06
1.4±0.1
0
DMAA
65 ±0.6
2.7 ±0.3
1.6±0.2
0
Total
11.8
4.7
3.0
0
MMAA
Arsenate
1.6 ±0.1
0
0
0
Arsenite
0
0
0
0
MMAA
0.6±0.04
0.1 ±0.01
0.7 ±0.04
0
DMAA
28.1 ±2.5
3.6 ±0.3
20.4 ±1.8
2.5 ±0.3
Total
30.3
3.7
21.1
2.5
a Seven days after the cells were exposed to arsenicals.
b Seven days after the cells were transferred to fresh media.