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| Title: | Effects of Sorbate speciation on sorption of selected Sulfonamides in three loamy soils |
| Author (s): | Kurwadkar, Sudarshan T. Adams, Craig D. Meyer, Michael T. Kolpin, Dana W. |
| Department/Lab Affiliations: | Civil, Architectural & Environmental Engineering Environmental Research Center |
| Keywords: | Antimicrobials Soil pH Soil sorption Speciation Sulfamethazine Sulfathiazole Sulfonamides |
| Issue Date: | 2007 |
| Publisher: | American Chemical Society |
| Citation: | Kurwadkar, S., Adams, C., Meyer, M., Kolpin, D. (2007) “Effects of Sorbate Speciation on Sorption of Selected Sulfonamides in Three Loamy Soils,” J. Agriculture and Food Chemistry, 55, 1370-1376. |
| Abstract: | Sorption of sulfamethazine (SMN) and sulfathiazole (STZ) was investigated in three soils, a North Carolina loamy sand, an Iowa sandy loam, and a Missouri loam, under various pH conditions. A significant increase in the sorption coefficient (KD) was observed in all three soils, as the sulfonamides converted from an anionic form at higher pH to a neutral/cationic form at lower pH. Above pH 7.5, sulfonamides exist primarily in anionic form and have higher aqueous solubility and no cationic character, thereby consequently leading to lower sorption to soils. The effect of speciation on sorption is not the same for all sulfonamides; it is a function of the pH of the soil and the pKa of the sulfonamides. The results indicate that, for the soils under investigation, SMN has comparatively lower KD values than STZ. The pH-dependent sorption of sulfonamides was observed to be consistent in all three soils investigated. The KD values for each speciated form-cationic, neutral, and anionic-were calculated using an empirical model in which the species-specific sorption coefficients (KD0, KD1, and KD2) were weighted with their respective fractions present at any given pH. |
| Type: | Article - Journal text |
| Copyright Notice: | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. FULL COPYRIGHT INFORMATION: |
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| title | Effects of Sorbate speciation on sorption of selected Sulfonamides in three loamy soils |
| contributor.author | Kurwadkar, Sudarshan T. |
| contributor.author | Adams, Craig D. |
| contributor.author | Meyer, Michael T. |
| contributor.author | Kolpin, Dana W. |
| contributor.deptlab | Civil, Architectural & Environmental Engineering |
| contributor.deptlab | Environmental Research Center |
| contributor.sponsor | Geological Survey |
| contributor.sponsor | Missouri department of natural resources |
| subject | Antimicrobials |
| subject | Soil pH |
| subject | Soil sorption |
| subject | Speciation |
| subject | Sulfamethazine |
| subject | Sulfathiazole |
| subject | Sulfonamides |
| date.issued | 2007 |
| publisher | American Chemical Society |
| identifier.citation | Kurwadkar, S., Adams, C., Meyer, M., Kolpin, D. (2007) “Effects of Sorbate Speciation on Sorption of Selected Sulfonamides in Three Loamy Soils,” J. Agriculture and Food Chemistry, 55, 1370-1376. |
| identifier.pub.URI | |
| description.abstract | Sorption of sulfamethazine (SMN) and sulfathiazole (STZ) was investigated in three soils, a North Carolina loamy sand, an Iowa sandy loam, and a Missouri loam, under various pH conditions. A significant increase in the sorption coefficient (KD) was observed in all three soils, as the sulfonamides converted from an anionic form at higher pH to a neutral/cationic form at lower pH. Above pH 7.5, sulfonamides exist primarily in anionic form and have higher aqueous solubility and no cationic character, thereby consequently leading to lower sorption to soils. The effect of speciation on sorption is not the same for all sulfonamides; it is a function of the pH of the soil and the pKa of the sulfonamides. The results indicate that, for the soils under investigation, SMN has comparatively lower KD values than STZ. The pH-dependent sorption of sulfonamides was observed to be consistent in all three soils investigated. The KD values for each speciated form-cationic, neutral, and anionic-were calculated using an empirical model in which the species-specific sorption coefficients (KD0, KD1, and KD2) were weighted with their respective fractions present at any given pH. |
| type | Article - Journal |
| type.DCMIType | text |
| type.status | Final version |
| rights | This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder. |
| rights.URI | |
| date.accessioned | 2007-04-11T17:00:48Z |
| date.available | 2007-10-01T15:51:03Z |
| identifier.persist.URI |