Birge and Juday code number
current lake name
depth at which the sample or measurement was taken
apparent color (mg Pt/L) [mg PT relative to color scale]
The log base ten of hydrogen ion concentration in a given sample
secchi disk reading
residue (2-6 liters evaporated to 25 ml at 70-75 deg c then dried and weighed)
The quantity of carbon bound to organic compounds in a given sample.
The quantity of nitrogen bound to organic molecules in a given sample.
The ratio of organic carbon to organic nitrogen in a given sample.
The total quantity of protein in a given sample.
The quantity of nitrogen in a sample that is not associated with proteins. For example nitrogen associated with DNA or other inorganic sources.
The quantity of ether extracted from a given sample.
The total amount of organic material in a given sample.
plankton biomass (weight loss on ignition (600 degc) of dried (60 degc) residue centrifuged from 1 l samples.
The total amount of inorganic material in a given sample.