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17 Vandal, G.M., R.P. Mason, W.F. Fitzgerald. 1991. Cycling of Volatile Mercury in Temperate Lakes. Water, Air, and Soil Pollution.
56:791-803.
18 Amyot, M. D. Lean, G. Mierle. 1997. Photochemical Formation of Volatile Mercury in High Arctic Lakes. Environmental
Toxicology and Chemistry. 16(10): 2054-2063.
19 Ulrich, S.M. T.W. Tanton, S.A. Abdrahitova. 2001. Mercury in the Aquatic Environment: A Review of Factors Affecting
Methylation. Critical Reviews in Environmental Science and Technology. 31 (3): 241-293.
20 Gilmour, C.C., Riedel, G.S. 1995. Measurement of Hg Methylation in Sediments Using High Specific-Activity 203Hg and Ambient
Incubation. Water, Air, and Soil Pollution. 80:747-756.
21 Hintelmann, H. K. Keppel-Jones, R.D.Evans. 2000. Constants of Mercury Methylation and Demethylation Rates in Sediments and
Comparison of Tracer and Ambient Mercury Availability. Environmental Toxicology and Chemistry. 19(9): 2204-2211.
22 Stordal, M.C. and G.A.Gill. 1995. Determination of Mercury Methylation Rates Using a 203-HG Radiotracer Technique. Water,
Air, and Soil Pollution. 80: 725-734.
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Selecting this entry will take you to a page where you can search this site for other documents you might need.

Selecting this entry will take you to the Advanced search page. This provides more control over what documents will be selected, how many results are returned, how the search will be carried out and numerous other features.

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This will link you to a series of pages that represent a catalog of the full content of the repository. Some prefer this method when searching titles as it permits the use of the browsers search capability. These pages can be rather large.

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This entry location shows the number of pages to be loaded for display at one time. The default is 1 but is user selectable up to 20. The number of pages can be selected by moving the bottom slider until it reflects the desired quantity or enter the page number here...

The number of pages loaded will also be displayed in the upper right of the window.

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This tool will use the content of the current document to create another search to try to locate additional documents that address the same topics as this one. Note: When the results list is generated in response to this control, the terms selected will appear at the top of the list. If the results list is too small, try copying the terms for a new search but eliminate any that seem too restrictive. To further restrict a large results list, try using the Search Cloud feature available in the results list display.

This will take you to the current results list. If you have changed your search terms using the "Search in document" feature, your results list may be different than the one that got you here!

The NEPIS system will provide the current document packaged as a Multipage TIFF in a new window. This format can be useful if you have Microsoft's document imaging, as that application can OCR the document delivered, making it searchable without using the NEPIS system.

The NEPIS system will provide the current document packaged as a PDF in a new window. Some PDFs are documents that were created in that format, others were created from the scanned images you see displayed online. Of this later type, some have been created in advance to expedite delivery, others are created at the time they are requested. If the one you request fits this last category, please be patient, as it may take several minutes for our servers to collect, package, format, and deliver the resulting document. The larger the document (either because of a large number of pages or color content) the longer the delivery time.

The NEPIS system will provide the full text of the document as seen by our OCR engine. Sometimes useful if you wish to access the text for 'cut and paste' references.

This control toggles the display of addtional metadata associated with each document. Click this to display information describing such things as publication number, document title, and etc., then again to remove that information from the display

This selection will save a link to this document in your document basket. You may use this to avoid searching for the document again in the future or, if available in hardcopy, you can use that entry to order the publication (all EPA Publications are free of charge)

By selecting this checkbox, keep the search terms already highlighted and simply add the new entry to the list.

This feature allows you change the focus of your search by selecting a new search term to be found in this document.

This feature allows you to alert EPA to a problem with the document or page you are viewing. Whenever posible, document images or structure will be repaired in response to these reports.

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