Here we go again with (MeHg) bs?

[Hefty1]

https://www.fbo.gov/index?s=opportu...c2235957b6e3f4290a44e&tab=core&tabmode=list&=



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F--CDFG MeHg Research at Cosumnes River Preserve
Solicitation Number: 0040022978
Agency: Department of the Interior
Office: Bureau of Land Management
Location: California RegionPrintLink
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Notice DetailsPackagesInterested Vendors ListOpportunity History
Original Synopsis
Nov 23, 2011
2:41 pm
Solicitation Number:
0040022978 Notice Type:
Sources Sought Synopsis:
Added: Nov 23, 2011 2:41 pm
THIS IS AN NOTICE ONLY AND NOT A REQUEST FOR PROPOSALThe Bureau of Land Management Mother Lode Field Office, Cosumnes River Preserve intents to award a contract to California Department of Fish and Game, Moss Landing Marine Laboratory(CDFG) is uniquely qualified to be the only responsible source for this project. CDFG is a co-authors with the BLM and others on the grant proposal that was submitted to, and funded by, the U.S. EPA. As such, the CDFG is obligated to be a collaborator in the implementation of the project with BLM and others because the grant funding was awarded to the BLM on the basis of the content of the proposal, the merit of the project, and the background and expertise of the project proponents, as was evidenced by the EPAs requirement to submit information about all of the co-authors and collaborators professional experience.Mr. Stephenson with CDFG is a recognized expert in the field of MeHg research. Specifically, Mr. Stephenson will assess MeHg in water samples that have been collected from previous field work. Analysis will be conducted according to the following description:MeHg samples will be collected following clean techniques. Two hundred fifty milliliter VWR trace cleaned bottles will be dipped 2-4 cm under the water until filled. Samples will be kept on ice and in the dark prior to preservation. Samples will be acidified within 48 hours of collection with reagent grade Baker HCl to bring the final concentration of acid to 0.5%. The samples will be analyzed for MeHg using an ethylation distillation method (EPA 1630) that has a detection limit of 0.02 ngL-1. All samples will be analyzed within 6 months of collection. The general Quality Assurance/Quality Control (QA/QC) program consists of approximately one field blank, field duplicate, standard reference material, analytical duplicate, matrix spike recovery (MS), and matrix spike recovery duplicate (MSD) for every 20 samples.The value of the proposed services is $69,930.00 The contract will be awarded on or about Thursday, December 8, 2011. If there are any questions or concerns feel free to email me at [email protected], or call me at 916-978-4322. Contracting Office Address:
BLM CA-STATE OFC BUS SVC BR (CA944)2800 COTTAGE WAY, SUITE W-1834SACRAMENTOCA95825US
Point of Contact(s):
Deborah R. Dokes 916-978-4322

Contracting Officer
General Information
Notice Type:
Sources Sought
Posted Date:
November 23, 2011
Response Date:
December 8, 2011
Archiving Policy:
Automatic, on specified date
Archive Date:
January 7, 2012
Original Set Aside:
N/A
Set Aside:
N/A
Classification Code:
F -- Natural resources & conservation services
NAICS Code:
813 -- Religious, Grantmaking, Civic, Professional, and Similar Organizations/813312 -- Environment, Conservation and Wildlife Organizations
For Help: Federal Service DeskAccessibility.

 

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[2cmorau]

i noticed that they don't mention the word Methylmercury but use the symbol instead

 

[russau]

i think these people need tobe dipped also! and kept on ice!

 

[Hefty1]

Interesting




4 - Methylation Control Study—Development of BMPs to reduce
methylmercury discharges from seasonal wetlands in the Yolo Bypass Area (Mark Stephenson, CDFG)

During Yolo Bypass flooding events, the methylmercury produced in the Yolo Bypass is 40% of the methylmercury load from the entire Sacramento River Watershed. Methylmercury production increases with higher flows in the Bypass. Methylmercury in seasonal wetlands monitored found consistently higher levels in and in discharges from them compared to inflowing waters.
Best Management Practices considered for reduction of methylmercury included temporary storage in ponds and vegetative management. Six hypotheses will be tested to evaluate BMP effectiveness:

1. MeHg is removed in permanent ponds
2. Pond physical size, age, depth and hydraulic residence time affect MeHg removal rates
3. MeHg is removed in permanent ponds by particle settling
4. MeHg is removed in permanent ponds by photodemethylation
5. MeHg production can be minimized by selecting for specific summer plants in seasonal wetlands
6. MeHg production can be minimized by summer grazing in seasonal wetlands


Jar experiments were conducted to characterize the effects of sediment and vegetation on methylation rates. Three conclusions were drawn from the findings:

Mass of Plant Material had an effect on MeHg —the more plant material the more MeHg

Dissolved Oxygen also had an effect on MeHg —the lower the DO the more MeHg

Amount of Sediment had no effect on MeHg

Culture addition experiments were also conducted, drawing the following conclusions:

MeHg production is far greater in sediment and plant experiment than in plant
experiment and in sediment only experiment

Addition of unfiltered culture (with bacteria) stimulated MeHg production in vegetation only experiment

MeHg production may occur in the water column but bacteria from sediment is probably needed

For more information: Mark Stephenson, 831-771-4177, [email protected].