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60
Chemical Examination
Milligrammes per litre
(unless otherwise stated)
Description of sample
Thames derived filtered water
Ammonia nitrogen
Albuminoid nitrogen
Oxidised nitrogen-nitrate
Chlorides as C1
Oxygen abs. from Permanganate
4 hours at 27 ºC
Turbidity in terms of silica
Colour m.m. brown 2 ft tube
Burgess's Tintometer
Hardness (total)
Hardness (non-carbonate)
pH value
Phosphate as PO4
Silicate as Si02
Sulphate as S04
Fluoride as F
Magnesium as Mg
Electrical Conductivity (Gemmhos)
Bacteriological Examination after Chlorination
(Water passing into supply)
0.027
0.077
4. 2
26.
1.26
0.3
12.
270.
66.
7.9
0.85
9.
58.
0. 15
5.
550.
Plate counts (average per ml.)
Colonies counted on agar 37 °C (20-24 hours) 9.7
Coliform count percentage samples negative
in 100 ml 99.07
Escherichia count percentage samples
negative in 100 ml 99.88
Hater 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 wells are
received regularly and have been satisfactory for the year under
review.