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Methylmercury Degradation Rates

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Metadata:

Identification_Information:
Citation:
Citation_Information:
Originator:
Ronald Oremland

Mark Marvin-DiPasquale

Publication_Date: 2005
Title: Methylmercury Degradation Rates
Geospatial_Data_Presentation_Form: spreadsheet
Online_Linkage: <http://sofia.usgs.gov/exchange/marvin-dipasquale/mmdindex.html>
Description:
Abstract:
The spreadsheet contains the data for 12 sites for sediment methylmercury degradation potential rate measurements
Purpose:
High concentrations of methyl-mercury (CH3Hg+), a toxic substance to both animals and humans, recently have been measured in a number of top predators (including panthers and game fish) native to the Florida Everglades. The objective of this research was to provide ecosystem managers with CH3Hg+ degradation rate data from a number of study sites that represent a diversity of hydrologic and nutrient regimes common to the Everglades. The focus was on better understanding the microbial and geochemical controls regulating CH3Hg+ degradation. At the time of the study, little was known about the specific factors influencing this process in natural systems.
Time_Period_of_Content:
Time_Period_Information:
Multiple_Dates/Times:
Single_Date/Time:
Calendar_Date: 199606
Single_Date/Time:
Calendar_Date: 199612
Single_Date/Time:
Calendar_Date: 199704
Single_Date/Time:
Calendar_Date: 199707
Single_Date/Time:
Calendar_Date: 199801
Single_Date/Time:
Calendar_Date: 199806
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -81
East_Bounding_Coordinate: -80
North_Bounding_Coordinate: 26.75
South_Bounding_Coordinate: 25
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: biology
Theme_Keyword: geology
Theme_Keyword: chemistry
Theme_Keyword: methylmercury
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: 007
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions, Federal Information Processing Standard (FIPS) 10-4, Washington, DC, National Institute of Standards and Technology
Place_Keyword: United States
Place_Keyword: US
Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, DC, NIST
Place_Keyword: Florida
Place_Keyword: FL
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1990, Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas, FIPS 6-3, Washington, DC, National Institute of Standards and Technology
Place_Keyword: Palm Beach County
Place_Keyword: Miami-Dade County
Place_Keyword: Monroe County
Place_Keyword: Broward County
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System
Place_Keyword: Everglades National Park
Place_Keyword: Loxahatchee National Wildlife Refuge
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Central Everglades
Place_Keyword: Greater Lake Okeechobee
Place_Keyword: Everglades Nutrient Removal area
Place_Keyword: WCA3
Place_Keyword: WCA2B
Place_Keyword: Water Conservation Area 3
Place_Keyword: Water Conservation Area 2B
Access_Constraints: none
Use_Constraints:
none All MeHg production and degradation rates were calculated as potential rates (i.e. based on the amount of radiolabel added) and not as in-situ rates.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Mark Marvin-DiPasquale
Contact_Organization: U.S. Geological Survey
Contact_Position: Project manager
Contact_Address:
Address_Type: mailing address
Address:
345 Middlefield Road,

Building 15, McKelvey Building

City: Menlo Park
State_or_Province: CA
Postal_Code: 94025
Country: USA
Contact_Voice_Telephone: 650 329 4442
Contact_Facsimile_Telephone: 650 329-4463
Contact_Electronic_Mail_Address: mmarvin@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name: <http://sofia.usgs.gov/exchange/marvin-dipasquale/mmdsitemap.gif>
Browse_Graphic_File_Description: map showing location of sampling sites
Browse_Graphic_File_Type: GIF
Native_Data_Set_Environment: MS Excel
Cross_Reference:
Citation_Information:
Originator:
Marvin-DiPasquale, Mark C.

Oremland, Ronald S.

Publication_Date: 1998
Title:
Bacterial methylmercury degradation in Florida Everglades peat sediment
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Environmental Science and Technology
Issue_Identification: v. 32, n. 17
Publication_Information:
Publication_Place: Washington, DC
Publisher: American Chemical Society
Other_Citation_Details:
All users may view the abstract of this article. If you are a subscriber, you may view the article. If you are not a subscriber, you may purchase and download the PDF version of the article.
Online_Linkage:
<http://pubs3.acs.org/acs/journals/doilookup?in_doi=10.1021/es971099l>
Cross_Reference:
Citation_Information:
Originator:
Marvin-DiPasquale, Mark C.

Agee, Jennifer; McGowan, Chad; Oremland, Ronald S.; Thomas, Martha; Krabbenhoft, David; Gilmour, Cynthia C.

Publication_Date: 2000
Title:
Methyl-mercury degradation pathways: a comparison among three mercury-impacted ecosystems
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Environmental Science and Technology
Issue_Identification: v. 34 , n. 23
Publication_Information:
Publication_Place: Washington, DC
Publisher: American Chemical Society
Other_Citation_Details:
All users may view the abstract of this article. If you are a subscriber, you may view the article. If you are not a subscriber, you may purchase and download the PDF version of the article.
Online_Linkage:
<http://pubs3.acs.org/acs/journals/doilookup?in_doi=10.1021/es0013125>
Data_Quality_Information:
Logical_Consistency_Report:
Data were collected at a suite of sites between 1995 and 1998 in the Water Conservation Areas and Everglades National Park. Due to changes in methodology, only data collected since June 1996 is included in the dataset
Completeness_Report: Not all sites have data for all dates
Lineage:
Process_Step:
Process_Description:
Periodic field measurements of methylmercury (MeHg) degradation potential rates in sediment were conducted between 1995 and 1998, at a suite of study sites in the Water Conservation Areas and Everglades National Park. Intact sediment cores were collected by hand with polycarbonate core tubes (8 cm i.d. x 15-30 cm). The unconsolidated surface floc layer was treated as one discrete interval for June 1996, December 1996, and January 1998. Sediment below this zone was sectioned into 2 cm to 4 cm discrete depth intervals. Discrete depths were sampled for the whole core during April 1997, July 1997, and June 1998. For each interval, sediment from 3-6 cores was pooled for a homogenized composite sample. Subsamples (3 cc) were amended with radiolabeled 14C-MeHg (0.5 to 10 nCi) and incubated anoxically for 0.2 to 7 days at 18-25 deg C in 13 cc serum bottles. Incubations were arrested by adding 1 ml of 3 M NaOH. All incubations were initiated within 10 hours of sample collection, except during April 1997, which were initiated three days after collection. All site/depth discrete sample sets included n=3 replicates and one autoclave killed control. The gaseous 14 C endproducts (14 CH4 and 14 CO2) were assayed by a CH4 combustion/CO2 trapping assay as described in Marvin-DiPasquale and Oremland (1998) Environ. Sci. Tech. 32:2256-2263.
Process_Date: 1998
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Mark Marvin-DiPasquale
Contact_Organization: U.S. Geological Survey
Contact_Position: Project manager
Contact_Address:
Address_Type: mailing address
Address:
345 Middlefield Road,

Building 15, McKelvey Building

City: Menlo Park
State_or_Province: CA
Postal_Code: 94025
Country: USA
Contact_Voice_Telephone: 650 329 4442
Contact_Facsimile_Telephone: 650 329-4463
Contact_Electronic_Mail_Address: mmarvin@usgs.gov
Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: Water Conservation Areas and Everglades National Park
Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Data collected for each site contain site id, date, sediment depth interval (cm), incubation time (days), 14C-MeHG injected (ng/cc wet sed), MeHg degradation first-order rate constant (k), and Me-Hg degradation potential rate (ng/cc set sed/d)
Entity_and_Attribute_Detail_Citation: USGS personnel
Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Heather S.Henkel
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing address
Address: 600 Fourth St. South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: hhenkel@usgs.gov
Resource_Description:
Everglades Sediment Methylmercury Degradation Potential Rate Measurements
Distribution_Liability: The data have no explicit or implied guarantees.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: MS Excel
Format_Version_Number: unknown
Transfer_Size: 0.041
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://sofia.usgs.gov/exchange/marvin-dipasquale/mmdindex.html>
Access_Instructions: Data may be downloaded from the SOFIA website.
Fees: none
Metadata_Reference_Information:
Metadata_Date: 20080122
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Heather Henkel
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: sofia-metadata@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
This page is <http://sofia.usgs.gov/metadata/sflwww/MeHg_degrad_rates.html>

U.S. Department of the Interior, U.S. Geological Survey
Comments and suggestions? Contact: Heather Henkel - Webmaster
Generated by mp version 2.8.18 on Tue Jan 22 11:59:38 2008