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The Pamphlet Collection of Sir Robert Stout: Volume 32

Estimation of Hardness, Nitrogenous Organic Matter, Nitrates and Nitrites

SOURCE. HARDNESS. Representing grains of Carbonate of Lime per gallon, or its equivalent in soap-consuming power. AMMONIA. Parts in one million, or seven hundredths of a grain per gallon. NITROGEN OF NITRATES AND NITRITES. Before Boiling. After Boiling. Already Formed. Derivable from Organic Matter, Albuminoid Ammonia. Grains per Gallon. DUNEDIN—Ross's Creek, above Reservoir ... 2.45 1.2 0.010 0.057 0.026 DUNEDIN—Small or Upper Reservoir ... 3.57 2.1 0.010 0.064 0.028 DUNEDIN—Lower Larger Reservoir ... ... 2.30 1.0 0.010 0.098 0.021 DUNEDIN—Salutation Hotel ... ... ... 2.55 1.0 0.080 0.069 0.070 DUNEDIN—Dunedin Corporation Offices ... 2.50 0.9 0.010 0.085 0.025 DUNEDIN—Last House in St. Andrew Street... 3.00 1.25 0.015 0 .061 0.021 DUNEDIN—Prof. Black's House, High Street... 2.7 1.10 0.040 0.075 0.035 LONDON SUPPLY—Moorgate Street ... ... 15.6 ... 0.015 0.084 0.250 LONDON SUPPLY—Southwark and Vauxhall Co. ... ... 0.015 0.15 ... MANCHESTER SUPPLY—Brazenose Street ... ... ... 0.016 0.06 0.0007 MANCHESTER SUPPLY—Palatine Hotel ... ... ... 0.014 0.10 ... EDINBURGH SUPPLY—University Laboratory ... ... ... 0.004 0.07 ... EDINBURGH SUPPLY—Colinton Reservoir ... ... ... 0.14 0.08 ... GLASGOW SUPPLY—Loch Katrine ... ... ... ... 0 .004 0.08 0.021 BALA LAKE—N. Wales ... ... ... 1.4 1.4 ... ... 0.000 ELLESWATER—Westmoreland, England ... 1.33 0.98 ... ... 0.003 LONDON SUPPLY—Lambeth Co. ... ... 14.1 ... 0.015 0.15 ... WELL, near Preston ... ... ... ... ... ... ... ... 1.726 *The average of these 7 samples of Dunedin water gives the Albuminoid Ammonia as 0.072; while that of Glasgow (Loch Katrine) is 0.080.

Estimation of Hardness, Nitrogenous Organic Matter, Nitrates and Nitrites.