U.S. flagAn official website of the United States government
                    Here's how you know **Official websites use .gov**
                            
                            A **.gov** website belongs to an official government organization in the United States.
 **Secure .gov websites use HTTPS**
                            
                            A **lock** (                            
                              A locked padlock                                                      
                            
                            ) or **https://** means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.


Menu Agricultural Research Service
						
                    U.S. DEPARTMENT OF AGRICULTURE
 Hydrology and Remote Sensing Laboratory: Beltsville, MD
 close



    Research

                    Research Projects
                                    Publications
                                    Collaborations
                                    News
                                    Software
                People

                    Staff Listing
                                    CareersSearch small
                    Search
            
            ARS Home
                                About ARS
                                Contact Us




ARS Home Northeast Area Beltsville, Maryland (BARC) Beltsville Agricultural Research Center Hydrology and Remote Sensing Laboratory Research Publications at this Location





- ARS National Programs
- Search for a scientific manuscript
- Search for a research project
- ARS Software
- Programs and Projects
- Collaborations
- Subjects of Investigation
- Publications
- People
- Research Sites
- Pesticide Volatilization
- Watershed Modeling
- Climate Change
- Soil Moisture
- Drought and ET
- HRSL Brochure

Title:   Author  item
                                            Hapeman, Cathleenitem
                                            McConnell, Lauraitem
                                            Rice, Clifforditem
                                            McCarty, Gregoryitem
                                            Bialek Kalinski, Krystynaitem
                                            GOEL, ANUBHA - Indian Institute Of Technologyitem
                                            TORRENTS, ALBA - University Of Maryland
  Submitted to: Meeting Abstract
                                    Publication Type: Abstract Only
                                    Publication Acceptance Date: 5/22/2013
                                    Publication  Date: 9/8/2013
                                    Citation: Hapeman, C.J., Mcconnell, L.L., Rice, C., Mccarty, G.W., Bialek Kalinski, K.M., Goel, A., Torrents, A. 2013. Determining contaminate sources to the Chesapeake Bay and developing mitigation strategies. Meeting Abstract. ENVR 147.Interpretive Summary:
                                Technical Abstract: Contaminants and excess nutrients from atmospheric deposition and non-point sources contribute to water quality impairment in the Chesapeake Bay watershed.  Assessment of landscape metrics and air and water quality data have provided insight into the fate, delivery, and transport mechanisms of pollutants, particularly those associated with agriculture.  Three cases studies will be presented.  1) Riparian areas are known to decrease nutrient contamination from agricultural runoff and can capture pesticide spray drift.  In some cases, however, the riparian tree canopy can also provide a direct conduit to local streams for pesticide residues. 2) MESA {2-[2-ethyl-N-(1-methoxypropan-2-yl)-6-methylanilino]-2-oxoethanesulfonic acid}, a metabolite of the extensively-used herbicide metolachlor, was used to track nitrate-N concentrations within the mainstem of the Choptank River, a Chesapeake Bay tributary.  Very little nitrate-N consumption was observed in the estuary suggesting that excessive eutrophication was due to an alternative nitrogen source, most likely ammonia-N deposition.  Furthermore, conservation practices should focus on reducing nitrate-N loads and enhancing denitrification further upstream in the cropland areas (headwaters) prior to entry into the estuary.  3) Polybrominated diphenyl ethers (PBDEs), frequently found in waste water treatment effluent, were detected in significantly higher concentrations in air samples collected downwind from sprayfields utilized for wastewater disposal.  Examination of land use data, physio-chemical properties of PBDEs, and back-trajectory analysis revealed that the PBDEs were volatilized from spray droplets and may be an important source of these contaminants in the region.


Return to top


Connect with ARS Sign up


ARS Home
                            USDA.gov
                            Plain Writing
                            Policies & Links
                            Civil Rights Statements
                            FOIA
                            Accessibility Statement
                            Privacy Policy
                            Non-Discrimination Statement
                            Quality of Information
                            USA.gov
                            WhiteHouse.gov