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Nutrient 2005 Metadata

Cruises: Fixed Station cruises for May, June, July, August, and September 2005
Ship: EPA Lake Guardian
Data type: Particulate and dissolved nutrients on discrete water samples collected from Niskin bottles on CTD rosette.

Analytical Methods
All nutrient analyses were conducted using standard automated colorimetric procedures on a Technicon AutoAnalyzer II following the details of Davis and Simmons (1979).
Total Phosphorus (TP) : molybdate/ascorbic acid method after persulfate digestion
Total Dissolved Phosphorus (TDP): molybdate/ascorbic acid method after persulfate digestion of 0.2 uM filtered samples
Soluble Reactive Phosphorus (SRP) : molybdate/ascorbic acid method of 0.2 uM filtered samples
Nitrate + Nitrite (NO3): cadium reduction method on 0.2 uM filtered samples
Ammonium (NH4): phenol method on 0.2 uM filtered samples
Soluble Reactive Silica (SiO2): molybdate/ascorbic acid method on 0.2 uM filtered samples

Units
TP (ug/L)
TDP (ug/L)
SRP (ug/L)
NO3 (mg/L)
NH4 (ug/L)
SiO2 (mg/L)

Contact Information:

Tom Johengen
CILER
University of Michigan
Phone: 734-741-2203
Email: