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Average Results of the Chemical and Bacteriological Examination of
the water supplied to Hornsey during the year 1959.
Milligrammes per Litre (unless otherwise stated)
River Thames New River
(Ashford Common) (Stoke Newington
&
Hornsey)
Ammonia Nitrogen 0.031 .018
Albuminoid Nitrogen . 077 .050
Oxidised Nitrogen: Nitrate 3.3 5.4
Chlorides as C1. 27 32
Oxygen abs. from permanganate
4 hrs. at 27°C. 1. 02 0. 50
Turbidity in terms of Silica 0. 4 0.1
Colour m.m. brown 2ft. Tube
Burgess's Tintometer 9 5
Hardness (Total) 254 298
Hardness (non-carbonate) 54 70
pH. Value 7.9 7.8
Phosphate as PO4 0. 90 0. 55
Silicate as SiO2 9 12
Sulphate as SO4 54 59
Fluoride as F. 0.2 0.2
Magnesium as Mg. 4. 0 5. 0
B. O. D. 5 days at 20°C.
Electrical Conductivity
(gemmhos) 525 625
16