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67
Chemical Examination
Milligrammes per litre
Description of sample (unless otherwise stated)
Thames derived filtered water
Ammonia nitrogen 0.032
Albuminoid nitrogen 0.073
Oxidised nitrogen-nitrate 3.8
Chlorides as CI 29,0
Oxygen abs, from Permanganate
4 hours at 27 °C 1.06
Turbidity in terms of silica 0.4
Colour m.m. brown 2 ft tube
Burgess's Tintometer 10.0
Hardness (total) 244.0
Hardness (non carbonate) 54.0
PH value 7.7
Phosphate as P04 1.0
Silicate as Si02 9.0
Sulphate as S04 54.0
Fluoride as F 0.2
Magnesium as Mg 4.0
Electrical Conductivity (Gemmhos) 525. 0
Becteriological Examination after CMorination
Water passing into supply)
Plate counts (average per ml.)
Colonies counted on agar 37°C (20-24 hours) 8.1
Coliform count percentage samples negative
in 100 ml 99.31
Escherichia count percentage samples
negative in 100 ml 99.94
Water from Wells
There are a number of wells in use, the majority of which
however supply water used only for industrial purposes. The
water from two wells is used for drinking purposes, or for the
preparation of food. Reports of the analyses of water from
these two welIs arereceived regularlyand have been satisfactory
the year under review.