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

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 3. Confidence intervals of sample means for samples from the Tualatin River basin, Oregon.

	Mean 95-percent confidence interval (number of samples)
	δ¹³C	δ¹⁵N	C/N atomic ratio
All splits acidified	± 0.32 (55)	± 0.44 (55)	± 1.7 (55)
All splits unacidified	± 0.33 (90)	± 0.79 (89)	± 2.3 (90)
Mixed acidification	± 0.53 (32)	± 0.74 (32)	± 1.2 (32)

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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