Environmental Engineering Reference
In-Depth Information
(y)
450
400
Peak A
Peak W
350
(z)
300
250
300
350
(a
′
)
The molecular structure of DSBP (
y
).
z
,
a
′ The fluorescent components of standard DAS1 (
z
) identified
using PARAFAC modeling on EEM data of its aqueous samples (
Data source
Mostofa and Sakugawa
2009
). The molecular structure of DAS1 (y).
with two fluorescence peaks at Ex/Em
=
335-345/430-437 nm (peak C-region)
and at 240-255/425-447 nm (peak A-region), respectively (Fig.
3
b′). The sec-
ond fluorescent component is denoted as detergent component (T
UV
-like), with a
fluorescence peak at Ex/Em
=
225-230/287-296 nm (peak T
UV
-region) (Fig.
3
c′;
Table
2
). Detergent component (C-like) has been detected at Ex/Em
=
345/430-
435 and 240/427-433 nm for household detergents (Nafine Chem Ind Ltd and
Nice group Co Ltd, China) dissolved in Milli-Q water; at 335-350/432-437 and
at 250-255/425-447 nm in river waters; at 335-345/422-437 and 240-250/422-
443 nm in sewerage waters; and at 340/440 and 250/440 nm in drinking water
treatment plants (Tables
1
,
2
) (Mostofa et al.
2010
; Baghoth et al.
2010
; Guo et al.
2010
). The detergent component (T
UV
-like) has been detected at Ex/Em
=
225-
230/291-296 nm in sewerage waters (Table
2
) (Mostofa et al.
2010
). Household
detergents are generally detected by EEM spectroscopy (Mostofa et al.
2005a
,
2010
; Komaki and Yabe
1982
) and other spectroscopic methods (Kramer et al.
1996
) in effluent discharged by households located in towns. The detergent com-
ponent (C-like) is rapidly decomposed by natural sunlight whist it is refractory
to microbial degradation (Mostofa et al.
2010
). On the other hand, the detergent