HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Wall, G. J. Articles by Smeck, N. E. Search for Related Content PubMed Articles by Wall, G. J. Articles by Smeck, N. E. Agricola Articles by Wall, G. J. Articles by Smeck, N. E.

Physical, Chemical, and Mineralogical Properties of Fluvial Unconsolidated Bottom Sediments in Northwestern Ohio¹

ABSTRACT

Fluvial unconsolidated bottom sediments that have the potential to become part of the suspended sediment load in the Maumee River Basin, Ohio, ranged in texture from sandy loams to clays. Particle size analysis by water dispersion and electrolyte dispersion procedures revealed that an average of 34% of the total clay fraction was aggregated into the silt and sand-sized range, indicating that the coarser fraction of bottom sediments may be physically-chemically active. The water-dispersible clay was lower in mica but higher in expandable 14Å (smectite) and quartz constituents than the electrolyte-dispersible clay. The mineralogy of clay-sized bottom sediments (mica, 65 ± 5%; chlorite-vermiculite, 12 ± 5%; quartz, 14 ± 5%; expandable 14Å (smectite) and kaolinite, 5 ± 5%) from upstream agricultural drainage ditches, major Basin tributaries, and from the Maumee River are essentially identical.

The 2- to 50-µm fraction was dominated by quartz with secondary amounts of mica, kaolinite, feldspars, and carbonates. Mean calcite, dolomite, and calcium carbonate equivalent values were 4.1, 3.4, and 7.8%, respectively. Calcite dissolution in transport is probable on the basis of observed calcite-dolomite ratios.

Organic matter content of the fluvial bottom sediments (3 to 7%) was analogous to Lake Erie bottom sediments and Maumee River suspended sediments. CEC values ranged from 39 to 55 meq/100 g for the total clay fraction collected by electrolyte and water dispersion procedures. Enrichment of heavy metals of bottom sediments over surficial soil materials occurred for Cu, Ni, Zn, Ca, and Pb by factors of 1.6, 2.0, 2.3, 3.5, and 3.0, respectively. Traces of herbicides (atrazine, 2-4-D) and insecticides (DDT metabolites, endosulfan) were detected in the filtered stream water samples and bottom sediment materials.

Downstream trends in selected physical, chemical, and mineralogical properties could not be related to increased urban influences or increased stream discharge.

Key Words: clay mineralogy • water quality • sediment origin • heavy metal enrichment

¹ Contribution from Dep. of Agron., Ohio Agric. Res. and Dev. Center, Wooster, OH 44691; approved for publication J. Article no. 171-77, presented before Div. A-5, Am. Soc. of Agron., 15 Nov. 1974, Chicago, Ill.

² Soil Scientist, Agric. Canada, Univ. of Guelph, Ontario, Canada NIG 2W1; Professor, Soil and Crop Sci. Dep., Texas Agric. Exp. Stn., College Station, Tex., and Associate Professor, Dep. of Agron., Ohio State Univ. and Ohio Agric. Res. and Dev. Center, Columbus, OH 43210, respectively. The first two authors were formerly Graduate Research Assistant and Professor, respectively, Dep. of Agron., OARDC.

Received for publication July 9, 1977.