Parallel Factor Analysis of Excitation–Emission Matrices to Assess Drinking Water Disinfection Byproduct Formation During a Peak Formation Period

2009 ◽  
Vol 26 (10) ◽  
pp. 1551-1559 ◽  
Author(s):  
David W. Johnstone ◽  
Nancy P. Sanchez ◽  
Christopher M. Miller
Keyword(s):  
Factor Analysis ◽  
Drinking Water ◽  
Parallel Factor Analysis ◽  
Water Disinfection ◽  
Disinfection Byproduct ◽  
Drinking Water Disinfection ◽  
Parallel Factor ◽  
Excitation Emission Matrices ◽  
Byproduct Formation

Modulation of the Cytotoxicity and Genotoxicity of the Drinking Water Disinfection Byproduct Iodoacetic Acid by Suppressors of Oxidative Stress

2006 ◽  
Vol 40 (6) ◽  
pp. 1878-1883 ◽  
Author(s):  
Eduardo Cemeli ◽  
Elizabeth D. Wagner ◽  
Diana Anderson ◽  
Susan D. Richardson ◽  
Michael J. Plewa
Keyword(s):  
Oxidative Stress ◽  
Drinking Water ◽  
Iodoacetic Acid ◽  
Water Disinfection ◽  
Disinfection Byproduct ◽  
Drinking Water Disinfection

scholarly journals Seasonal characterization of CDOM for lakes in semi-arid regions of Northeast China using excitation-emission matrices fluorescence and parallel factor analysis (EEM-PARAFAC)

2015 ◽  
Vol 12 (7) ◽  
pp. 5725-5756 ◽  
Author(s):  
Y. Zhao ◽  
K. Song ◽  
Z. Wen ◽  
L. Li ◽  
S. Zang ◽  
...  
Keyword(s):  
Factor Analysis ◽  
Fluorescence Intensity ◽  
Northeast China ◽  
Arid Regions ◽  
Mean Value ◽  
Parallel Factor Analysis ◽  
Inland Waters ◽  
Parallel Factor ◽  
Excitation Emission Matrices ◽  
Semi Arid

Abstract. The seasonal characteristics of fluorescence components in CDOM for lakes in the semi-arid region of Northeast China were examined by excitation-emission matrices fluorescence and parallel factor analysis (EEM-PARAFAC). Two humic-like peaks C1 (Ex/Em = 230, 300/425 nm) and C2 (Ex/Em = 255, 350/460 nm) and two protein-like B (Ex/Em = 220, 275/320 nm) and T (Ex/Em = 225, 290/360 nm) peaks were identified using PARAFAC. The average fluorescence intensity of the four components differed with seasonal variation from June and August 2013 to February and April 2014. The total fluorescence intensity significantly varied from 2.54 ± 0.68 nm−1 in June to the mean value 1.93 ± 0.70 nm−1 in August 2013, and then increased to 2.34 ± 0.92 nm−1 in February and reduced to the lowest 1.57 ± 0.55 nm−1 in April 2014. In general, the fluorescence intensity was dominated by peak C1, indicating that most part of CDOM for inland waters being investigated in this study was originated from phytoplankton degradation. The lowest C2 represents only a small portion of CDOM from terrestrial imported organic matter to water bodies through rainwash and soil leaching. The two protein-like intensities (B and T) formed in situ through microbial activity have almost the same intensity. Especially, in August 2013 and February 2014, the two protein-like peaks showed obviously difference from other seasons and the highest C1 (1.02 nm−1) was present in February 2014. Components 1 and 2 exhibited strong linear correlation (R2 = 0.633). There were significantly positive linear relationships between CDOM absorption coefficients a(254) (R2 = 0.72, 0.46, p < 0.01), a(280) (R2 = 0.77, 0.47, p < 0.01), a(350) (R2 = 0.76, 0.78, p < 0.01) and Fmax for two humic-like components (C1 and C2), respectively. A close relationship (R2 = 0.931) was found between salinity and DOC. However, almost no obvious correlation was found between salinity and EEM-PARAFAC extracted components except for C3 (R2 = 0.469). Results from this investigation demonstrate that the EEM-PARAFAC technique can be used to evaluate the seasonal dynamics of CDOM fluorescence components for inland waters in semi-arid regions of Northeast China.

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