Environmental Engineering Reference
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(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
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