| Main Title |
Paraquat Sorption as a Function of Particle Size in Natural Sediments. |
| Author |
Karickhoff, Samuel W. ;
Brown., David S. ;
|
| CORP Author |
Environmental Research Lab., Athens, Ga. |
| Year Published |
1977 |
| Report Number |
EPA/600/J-78/013; |
| Stock Number |
PB-282 232 |
| Additional Subjects |
Particle size distribution ;
Pyridinium compounds ;
Herbicides ;
Sediments ;
Adsorption ;
Isotherms ;
Numerical analysis ;
Water pollution ;
Paraquat herbicide ;
Bipyridinium/dimethyl ;
Reprints
|
| Holdings |
| Library |
Call Number |
Additional Info |
Location |
Last
Modified |
Checkout
Status |
| NTIS |
PB-282 232 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
| Collation |
10p |
| Abstract |
The distribution of sorbed paraquat (1,1'-dimethyl-4,4'-bypyiridinium ion) as a function of particle size (sand through clay) was determined on five natural sediments. Paraquat concentrations in individual size fractions varied as much as two orders of magnitude within a given sediment, showing a pronounced preference for the fine silt and clay fractions. Adsorption isotherms were measured for individual size separates on one sediment. Paraquat distributions in the whole sediment agreed well with those computed using the isotherm coefficients determined on individual size separates. Paraquat sorbs by ion exchange, and sorption partition coefficients showed a definite correlation with the cation exchange capacity (CEC) of individual size fractions. However, exchange sites in different fractions differed in their effectiveness in sorbing paraquat, with the fine silt and clay exchange sites being more effective than those of the larger separates. |
| Supplementary Notes |
Pub. in Jnl. of Environmental Quality, v7 n2 p246-252 Apr-Jun 78. |
| NTIS Title Notes |
Journal article. |
| Title Annotations |
Reprint: Paraquat Sorption as a Function of Particle Size in Natural Sediments. |
| PUB Date Free Form |
6 Jun 77 |
| Category Codes |
13B; 68E; 68D |
| NTIS Prices |
PC A02/MF A01 |
| Primary Description |
600/01 |
| Document Type |
NT |
| Cataloging Source |
NTIS/MT |
| Control Number |
323743428 |
| Origin |
NTIS |
| Type |
CAT |
