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Subject is Ammonia
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View Resource New Information on the Long-Term Fate of Ammonium in Ground Water

The ammonium (NH4+) dissolved in ground water in the center of a contaminant plume on Cape Cod, Massachusetts, has persisted for decades after it entered the subsurface, while other forms of nitrogen...

http://toxics.usgs.gov/highlights/nh4_gw/
View Resource summary of Sample Containers, Preservation Methods, and Holding Times

List of analytes and holding times with recommended volumes and container types - nitrite, nitrate, pH, turbidity, E. coli, ammonia, heavy metals, etc.

http://chemlab.cc/sample.pdf
View Resource Sample Analysis Holding Time/Container/Preservation Check Sheet

Record sheet for samples and holding times of common analytes - BOD, chlorine, ammonia, oil and grease, nitrate, nitrite, mercury, total phosphates, etc.

http://www.deq.state.va.us/export/sites/default/vpdes/checkl...
View Resource Holding Time for Common Analyses

Access Washington Lab Accreditation Program, table of holding times, extensive list of commonly sampled substances including heavy metals, pesticides, BOD, oil and gas.

http://www.ecy.wa.gov/programs/eap/labs/holdtime.htm
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