| Abstract: | Suspended material samples were collected at 16 sites along the Mississippi River and some of its tributaries during July-August 1991, October-November 1991, and April-May 1992, and separated into colloid and particulate fractions to determine the organic carbon content of these two fractions of suspended material. Sample collection involved centrifugation to isolate the suspended particulate fraction and ultrafiltration to isolate the colloid fraction. For the first time, particulate and colloid concentrations and organic carbon and nitrogen content were investigated along the entire reach of the Mississippi River from above Minneapolis, Minnesota, to below New Orleans, Louisiana. Organic carbon content of the colloid (15.2 percent) was much higher than organic carbon content of the particulate material (4.8 percent). Carbon/nitrogen ratios of colloid and particulate phases were more similar to ratios for microorganisms than to ratios for soils, humic materials, or plants.Suspended material samples were collected at 16 sites along the Mississippi River and some of its tributaries during July-August 1991, October-November 1991, and April-May 1992, and separated into colloid and particulate fractions to determine the organic carbon content of these two fractions of suspended material. Sample collection involved centrifugation to isolate the suspended particulate fraction and ultrafiltration to isolate the colloid fraction. For the first time, particulate and colloid concentrations and organic carbon and nitrogen content were investigated along the entire reach of the Mississippi River from above Minneapolis, Minnesota, to below New Orleans, Louisiana. Organic carbon content of the colloid (15.2 percent) was much higher than organic carbon content of the particulate material (4.8 percent). Carbon/nitrogen ratios of colloid and particulate phases were more similar to ratios for microorganisms than to ratios for soils, humic materials, or plants. |
| Genre: | Article |
| ProdID: | 70019463 |
| Citation Author: | Rostad, C. E.; Leenheer, J. A.; Daniel, S. R. |
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| Citation End Page: | 3225 |
| Citation Issue: | 11 |
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| Citation Language: | English |
| Citation Larger Work Title: | Environmental Science and Technology |
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| Citation Number Of Pages: | 8 |
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| Citation Publisher: | ACS |
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| Citation Search Results Text: | Organic carbon and nitrogen content associated with colloids and suspended particulates from the Mississippi River and some of its tributaries; 1997; Article; Journal; Environmental Science and Technology; Rostad, C. E.; Leenheer, J. A.; Daniel, S. R. |
| Citation Start Page: | 3218 |
| Citation Volume: | 31 |
| Citation Year: | 1997 |
| Type: | citation/reference |
| Text: | Organic carbon and nitrogen content associated with colloids and suspended particulates from the Mississippi River and some of its tributaries; 1997; Article; Journal; Environmental Science and Technology; Rostad, C. E.; Leenheer, J. A.; Daniel, S. R. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| URL (DIGITAL OBJECT IDENTIFIER): | http://dx.doi.org/10.1021/es970196b |
| Date Other: | Wed, 1 Jan 1997 00:00 -0600 |
| Publisher: | ACS |
