. A biological survey of the Erie-Niagara system. Supplemental to Eighteenth annual report, 1928. Natural history -- New York (State); Fishes -- Erie, Lake; Fishes -- Niagara River (N. Y. and Ont. ); Erie, Lake; Niagara River (N. Y. and Ont. ). Biological Survey—Erie-Niagara Watershed 109 conduct such additional determinations as biochemical oxygen demand, nitrogen ratios, and non-carbonate hardness when desirable. Analytical methods followed were essentially as outlined in ''Standard Methods of Water Analysis", 6th edition, 1925, Amer- ican Public Health Association. Ten day biochemical
. A biological survey of the Erie-Niagara system. Supplemental to Eighteenth annual report, 1928. Natural history -- New York (State); Fishes -- Erie, Lake; Fishes -- Niagara River (N. Y. and Ont. ); Erie, Lake; Niagara River (N. Y. and Ont. ). Biological Survey—Erie-Niagara Watershed 109 conduct such additional determinations as biochemical oxygen demand, nitrogen ratios, and non-carbonate hardness when desirable. Analytical methods followed were essentially as outlined in ''Standard Methods of Water Analysis", 6th edition, 1925, Amer- ican Public Health Association. Ten day biochemical oxygen demand was determined by incubation at 20° C. with dilution where necessary. All values for percentage saturation of dis- solved oxygen have been adjusted in accordance with the baromet- ric pressures of the regions. The heavy horizontal lines across the graphs represent 100 per cent of saturation. Dr. Peter R. Kosting, assistant chemist, United States Fixed Nitrogen Research Laboratory, was associated with the writer tliroughout the summer's A portable outfit for field work in pollution studies All data are listed in the accompanying tables, while a few series have been selected for graphical representation. Alkalinit}^ values are expressed as parts per million of calcium carbonate in all cases. The phenolphthalein end point having been accepted as the dividing line between free and fully bound or fixed carbon dioxide, the latter content, or as otherwise expressed content of normal carbonate is given by twice the phenolphthalein alkalinity. Total alkalinity as determined with methyl orange, minus twice the phenolphthalein alkalinity gives the bicarbonate (half bound carbon dioxide) expressed again as calcium carbonate. Such values may be converted into terms of bicarbonate by multiplying with the factor Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance o
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