290
K. M. G. Mostofa et al.
Type of samples/Locations Filtration
size/type
(μm)
Irradiation
time
(h, or, day)
Solar
intensity
(MJm
−2 )
DOC
Before
irradiation
Changes in DOC
Changes in DOC
References
Photoirradiation Microbial Photoirradiation Microbial
(μM
C)
(μM C)
%
Seawater
+ the control
addition (SC)
0.20
14 (Dark
incubation)
nd
515
na
−39
na
−8
Miller and
Moran
(1997)
Artificial seawater
+ the
control addition (AC)
0.20
14 (Dark
incubation)
nd
241
na
−13
na
−5
Miller and
Moran
(1997)
Baltic Sea, BY15, Gotland
Deep (57°N)
0.20
(unfiltered)
6
nd
328
−10
nd
−3
nd
Skoog et al.
(1996)
Baltic Sea, BY32,
Norrköping Deep (58°N)
0.20
(unfiltered)
6
nd
347
−10
nd
−3
nd
Skoog et al.
(1996)
Baltic Sea, F15,
Sydostbrotten (63°N)
0.20 (unfiltered)
4
nd
331
−23
nd
−7
nd
Skoog et al.
(1996)
a
means an increase in DOC concentration occurred during incubation period
b
means incubated unfiltered sample filtered before analytical measurements using Ekicrodisc 25 mm syringe filter with 0.45 mm HT-Tuffryn Membrane
(PALL, Gelman Laboratory)
(-) means losses in DOC concentration,na not applicable; nm
not exactly mentioned
NPD
nosignificant photochemical degradation; NMD
no significant microbial degradation
Table 1 (continued)