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8
Supply. (Parts per million.) Water filtered and chlorinated
at Hampton Works :
No. of Samples 234
Ammonical Nitrogen 0.008
Albuminoid Nitrogen 0.077
Oxidised Nitrogen (Nitrate) 3.5.
Chlorides as C1. 26.6
Oxygen abs. from Permanganate 4 hours at 27°C 1.04
Turbidity in terms of Silica 0.3
Colour m.m. brown 2ft. tube Burgess's Tintometer 13
Hardness Total 263
Hardness (Non-Carbonate) 64
pH Value 7.9
Phosphate A.S. P.O. 1114 0.62
Silica as SIO2 11
Magnesium 3.8
Sulphate 49
Conductivity 500
Bacteriological Results
No. of Samples 873
Colony Count on agar at 37°C (20-24 hours) 6.0
BACT. COLI TEST
Percentage of samples negative per 100 ml. 99.8
Bact. Coli per 100 ml 0.004
Typical Analysis of South West S.W. Co. Supply
(Parts per 100.000):
Chemical
Total solids (dried at 120°C.) 36.0
Combined chlorine (as C1.) 3.0
equivalent to Sodium Chloride (NaCl) 5.0
Nitric Nitrogen (Nitrates) 0.48
Nitrous Nitrogen (Nitrites) Nil.
Ammoniacal Nitrogen Nil.
Albuminoid Nitrogen 0.0104
Oxygen absorbed in 4 hours at 27° C 0.103
Lead or Copper Nil.