Table 11. Spearman rank correlations between carbon concentrations, optical properties, and disinfection by-product concentrations in finished water and DBP formation potentials for filtered and unfiltered samples from the Clackamas River basin, Oregon, 2010–11.
[Spearman rank correlations (rho values), with P values indicated by asterisks: * (P<0.05); ** (P<0.01); ***(P<0.001). See table 6 for constituent abbreviations and units. Abbreviations: DOC, dissolved organic carbon; THM4, total trihalomethanes; HAA5, total haloacetic acids; DBP, disinfection by-product; STHMFP, carbon-specific total trihalomethane formation potential; SHAAFP, carbon-specific total haloacetic acid formation poential; F, filtered; U, unfiltered; –, not applicable or no data]
| Constituent |
All sites |
|
Finished water |
|
All sites (basin-wide synoptic sampling events) |
| DOC |
THM4 |
HAA5 |
THMFP-F |
THMFP-U |
|
HAAFP-F |
HAAFP-U |
|
STHMFP-F |
STHMFP-U |
|
SHAAFP-F |
SHAAFP-U |
| Quantitative constituents |
| Streamflow |
– |
| **0.47 |
***0.64 |
| – |
– |
| – |
– |
| – |
– |
| – |
– |
| pH |
***-0.46 |
| -0.33 |
**-0.50 |
| **-0.41 |
**-0.40 |
| ***-0.50 |
***-0.51 |
| 0.27 |
*0.29 |
| ***-0.52 |
***-0.46 |
| Turbidity |
***0.72 |
| **0.46 |
***0.55 |
| ***0.88 |
***0.93 |
| ***0.94 |
***0.95 |
| *-0.29 |
-0.24 |
| ***0.71 |
***0.51 |
| Chlorophyll-a |
***0.53 |
| -0.20 |
-0.16 |
| ***0.71 |
***0.71 |
| ***0.70 |
***0.72 |
| *-0.29 |
*-0.31 |
| ***0.60 |
***0.47 |
| Total organic carbon |
***0.98 |
| ***0.63 |
***0.71 |
| ***0.95 |
***0.96 |
| ***0.98 |
***0.98 |
| *-0.32 |
*-0.28 |
| ***0.75 |
***0.58 |
| Dissolved organic carbon |
– |
| ***0.72 |
***0.83 |
| ***0.96 |
***0.95 |
| ***0.98 |
***0.97 |
| *-0.34 |
*-0.28 |
| ***0.77 |
***0.62 |
| Total particulate carbon |
***0.87 |
| 0.32 |
***0.71 |
| ***0.87 |
***0.93 |
| ***0.93 |
***0.94 |
| *-0.28 |
-0.26 |
| ***0.69 |
***0.49 |
| UVA254 |
***0.96 |
| ***0.67 |
***0.79 |
| ***0.94 |
***0.96 |
| ***0.98 |
***0.98 |
| *-0.33 |
-0.27 |
| ***0.78 |
***0.60 |
| Dissolved organic matter fluorescence |
***0.98 |
| ***0.68 |
***0.81 |
| ***0.95 |
***0.93 |
| ***0.95 |
***0.94 |
| *-0.34 |
*-0.28 |
| ***0.73 |
***0.58 |
| PEAK A |
***0.96 |
| ***0.65 |
***0.77 |
| ***0.93 |
***0.91 |
| ***0.92 |
***0.91 |
| **-0.34 |
-0.28 |
| ***0.69 |
***0.53 |
| PEAK C |
***0.98 |
| ***0.67 |
***0.80 |
| ***0.94 |
***0.92 |
| ***0.94 |
***0.93 |
| **-0.34 |
-0.28 |
| ***0.72 |
***0.56 |
| PEAK M |
***0.96 |
| ***0.64 |
***0.71 |
| ***0.93 |
***0.91 |
| ***0.92 |
***0.92 |
| **-0.34 |
-0.28 |
| ***0.69 |
***0.53 |
| PEAK D |
***0.98 |
| ***0.68 |
***0.81 |
| ***0.96 |
***0.93 |
| ***0.95 |
***0.95 |
| **-0.34 |
-0.28 |
| ***0.74 |
***0.59 |
| PEAK B |
***0.89 |
| ***0.60 |
***0.54 |
| ***0.85 |
***0.90 |
| ***0.93 |
***0.93 |
| **-0.37 |
-0.30 |
| ***0.72 |
***0.51 |
| PEAK T |
***0.92 |
| **0.46 |
**0.41 |
| ***0.88 |
***0.90 |
| ***0.92 |
***0.92 |
| **-0.39 |
-0.32 |
| ***0.69 |
***0.51 |
| PEAK N |
***0.94 |
| ***0.53 |
***0.53 |
| ***0.91 |
***0.91 |
| ***0.92 |
***0.91 |
| **-0.35 |
-0.29 |
| ***0.68 |
***0.51 |
| C1 Loading |
***0.91 |
| ***0.51 |
***0.54 |
| ***0.88 |
***0.87 |
| ***0.87 |
***0.87 |
| *-0.33 |
-0.27 |
| ***0.63 |
***0.47 |
| C2 Loading |
***0.98 |
| ***0.67 |
***0.80 |
| ***0.96 |
***0.94 |
| ***0.96 |
***0.95 |
| *-0.34 |
*-0.28 |
| ***0.74 |
***0.59 |
| C3 Loading |
***0.97 |
| ***0.68 |
***0.81 |
| ***0.95 |
***0.93 |
| ***0.94 |
***0.93 |
| *-0.34 |
*-0.28 |
| ***0.72 |
***0.56 |
| C4 Loading |
***0.98 |
| ***0.68 |
***0.80 |
| ***0.95 |
***0.93 |
| ***0.95 |
***0.94 |
| *-0.34 |
*-0.29 |
| ***0.73 |
***0.58 |
| C5 Loading |
***0.89 |
| **0.50 |
**0.44 |
| ***0.85 |
***0.90 |
| ***0.92 |
***0.92 |
| **-0.37 |
*-0.29 |
| ***0.69 |
***0.49 |
| Qualitative constituents |
| SUVA |
***0.49 |
| **0.44 |
***0.59 |
| ***0.72 |
***0.67 |
| ***0.73 |
***0.73 |
| **-0.39 |
**-0.37 |
| ***0.78 |
***0.70 |
| Spectral slope (S275–295) |
***-0.46 |
| **-0.40 |
-0.27 |
| ***-0.45 |
**-0.42 |
| ***-0.45 |
***-0.45 |
| 0.23 |
0.12 |
| ***-0.52 |
***-0.56 |
| Spectral slope (S290–350) |
-0.18 |
| -0.30 |
-0.19 |
| -0.18 |
-0.23 |
| -0.26 |
-0.26 |
| -0.04 |
-0.10 |
| -0.26 |
-0.28 |
| Spectral slope (S350–400) |
0.24 |
| 0.05 |
0.23 |
| 0.26 |
0.23 |
| 0.19 |
0.18 |
| -0.03 |
0.04 |
| 0.18 |
0.09 |
| Spectral slope ratio |
**-0.43 |
| -0.30 |
**-0.37 |
| **-0.44 |
-0.41 |
| **-0.4 |
**-0.39 |
| 0.19 |
0.08 |
| **-0.45 |
**-0.39 |
| Fluorescence Index |
0.18 |
| -0.25 |
**-0.44 |
| *0.28 |
0.23 |
| 0.17 |
0.17 |
| -0.01 |
0.09 |
| 0.13 |
0.20 |
| Humic Index |
0.07 |
| -0.12 |
-0.03 |
| 0.21 |
0.10 |
| 0.04 |
0.03 |
| 0.10 |
0.08 |
| 0.07 |
0.15 |
| Percent component 1 |
***0.55 |
| -0.04 |
-0.11 |
| ***0.57 |
***0.52 |
| ***0.48 |
***0.48 |
| -0.23 |
-0.19 |
| *0.29 |
*0.28 |
| Percent component 2 |
-0.02 |
| *0.37 |
***0.55 |
| -0.03 |
-0.09 |
| -0.08 |
-0.08 |
| 0.16 |
0.07 |
| 0.03 |
0.15 |
| Percent component 3 |
-0.16 |
| 0.02 |
0.23 |
| -0.14 |
-0.18 |
| -0.24 |
-0.25 |
| **0.38 |
*0.32 |
| -0.18 |
-0.10 |
| Percent component 4 |
-0.23 |
| 0.03 |
0.20 |
| -0.16 |
-0.23 |
| -0.24 |
-0.25 |
| **0.36 |
0.26 |
| -0.06 |
0.04 |
| Percent component 5 |
-0.24 |
| -0.21 |
**-0.45 |
| **-0.41 |
*-0.30 |
| -0.24 |
-0.23 |
| -0.10 |
-0.06 |
| -0.18 |
-0.27 |
|
First posted February 11, 2013
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U.S. Department of the Interior |
U.S. Geological Survey