USGS Scientific Investigations Report 2010–5154 - Use of Stable Isotopes of Carbon and Nitrogen to Identify Sources of Organic Matter to Bed Sediments of the Tualatin River, Oregon

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Scientific Investigations Report 2010–5154

Use of Stable Isotopes of Carbon and Nitrogen to Identify Sources of Organic Matter to Bed Sediments of the Tualatin River, Oregon

Table 2. Relation between acidified and unacidified δ¹³C, δ¹⁵N, and C/N results for samples from the Tualatin River basin, Oregon.

[Abbreviations: r², square of the Pearson correlation coefficient; N, number of points in regression]

Parameter	Regression statistics			Significantly different from y=x? (α=0.05)	Correction equation
Parameter	r²	Standard error	N	Significantly different from y=x? (α=0.05)	Correction equation
δ¹³C	0.95	0.588	32	No	None
δ¹⁵N	0.95	0.487	32	Yes	Unacidified = (Acidified + 0.3675) / 0.9385
C/N	0.96	1.360	32	Yes	Unacidified = (Acidified – 0.8405) / 1.0131

First posted August 17, 2010

Report PDF (2.6 MB)

For additional information contact:
Director, Oregon Water Science Center
U.S. Geological Survey
2130 SW 5th Ave.
Portland, Oregon 97201
http://or.water.usgs.gov

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