Spatiotemporal Characterization of Chromophoric Dissolved Organic Matter (CDOM) and CDOM-DOC Relationships for Highly Polluted Rivers
Abstract
:1. Introduction
2. Materials and Methods
2.1. Study Area
2.2. In Situ Data Collection and Processing
2.3. Measurement of Absorbance and Processing
2.4. Water Quality Measurement and Evaluation
2.5. Paramaterization and Statistical Analysis
3. Results
3.1. Pollution Status
3.2. Water Quality
3.2.1. Seasonal Variation
3.2.2. Spatial Variation
3.3. Spectral Characteristics of CDOM Absorption
3.3.1. Seasonal Variation
3.3.2. Spatial Variation
3.3.3. Relative Contributions of CDOM Absorption
3.4. Relationship between DOC and CDOM
3.5. Correlations between Environmental Factors and CDOM Absorption
4. Discussion
4.1. Dissolved Organic Carbon in Riverine Waters
4.2. Analysis of CDOM Spectral Characteristics
4.3. CDOM-DOC Relationship and Environmental Factors
5. Conclusions
Acknowledgments
Author Contributions
Conflicts of Interest
References
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P | Level |
---|---|
P < 0.8 | Qualification |
0.8 ≤ P ≤ 1.0 | Basic qualification |
1.0 < P ≤ 2 | Contamination |
P ≥ 2 | Serious contamination |
Average | pH | DO (mg/L) | NH3-N (mg/L) | COD (mg/L) | Fe (mg/L) | Mn (mg/L) | Zn (mg/L) | Hg (mg/L) | Cr6+ (mg/L) | p |
---|---|---|---|---|---|---|---|---|---|---|
Standards | 6–9 | 2 | 2.0 | 40 | 0.3 | 0.1 | 2.0 | 0.001 | 0.1 | - |
Summer | 6.79 | 2.93 | 0.07 | 392.16 | 0.62 | 0.28 | 0.06 | 0.34 | 0.012 | 8.11 |
Autumn | 6.08 | 9.47 | 0.15 | 49.37 | 2.83 | 0.54 | 0.13 | 0 | 0.002 | 9.03 |
Summer | Autumn | |||
---|---|---|---|---|
Avg ± SD. | Min–Max | Avg ± SD. | Min–Max | |
aCDOM(335) | 5.5 ± 3.5 | 0.3–10.6 | 5.4 ± 3.5 | 0.3–12.3 |
aCDOM(375) | 2.3 ± 1.8 | 0–5.2 | 2.6 ± 2.0 | 0–6.9 |
aCDOM(440) | 0.6 ± 0.6 | 0–1.7 | 0.8 ± 0.9 | 0–3.1 |
SUVA254 | 4.0 ± 1.4 | 1.6–6.3 | 2.3 ± 0.8 | 0.6–3.5 |
E250:365 | 11.7 ± 11.5 | 0–38.7 | 6.4 ± 2.8 | 0–10.1 |
S275–295 | 0.0089 ± 0.0020 | 0.0069–0.0147 | 0.0082 ± 0.0016 | 0.0066–0.0123 |
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Li, S.; Zhang, J.; Mu, G.; Ju, H.; Wang, R.; Li, D.; Shabbir, A.H. Spatiotemporal Characterization of Chromophoric Dissolved Organic Matter (CDOM) and CDOM-DOC Relationships for Highly Polluted Rivers. Water 2016, 8, 399. https://doi.org/10.3390/w8090399
Li S, Zhang J, Mu G, Ju H, Wang R, Li D, Shabbir AH. Spatiotemporal Characterization of Chromophoric Dissolved Organic Matter (CDOM) and CDOM-DOC Relationships for Highly Polluted Rivers. Water. 2016; 8(9):399. https://doi.org/10.3390/w8090399
Chicago/Turabian StyleLi, Sijia, Jiquan Zhang, Guangyi Mu, Hanyu Ju, Rui Wang, Danjun Li, and Ali Hassan Shabbir. 2016. "Spatiotemporal Characterization of Chromophoric Dissolved Organic Matter (CDOM) and CDOM-DOC Relationships for Highly Polluted Rivers" Water 8, no. 9: 399. https://doi.org/10.3390/w8090399