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10
Typical Analysis of South West S.W. Co. Supply. (Parts
per million.)
Chemical
Appearance : Clear and bright.
Turbidity (Silica Scale) Nil
Colour (Hazen) Faint yellow brown on the alkaline
side 10
Odour Nil
Reaction pH of neutrality 7.7
Free Carbon Dioxide 6
Electric Conductivity at 20°C 550
Total Solids, dried at 180°C 370
Chlorine in Chlorides 27
Alkalinity as Calcium Carbonate 205
Hardness:
Total 280 Carbonate (Temporary) 205
Non-carbonate (Permanent) 75
Nitrogen in Nitrates 4.4
Nitrogen in Nitrites Absent
Free Ammonia 0.016
Oxygen absorbed in 4 hrs. at 27°C 1.1
Albubinoid Ammonia 0.084
Residual Chlorine Absent
Metals Absent
Bacteriological
Number of
Colonies developing
on
Agar per c.c. 1 day at 37°C 2 days at 37°C 3 days at 20°C
or ml. in 4 7 2
Presumptive Coliform Reaction Absent from 100 ml.
Bact. coli Absent from 100 ml.
CI. welchii Reaction Present in 100 ml. Absent from 10 ml.
This sample is clear and bright in appearance, has a
.eaction on the alkaline side of neutrality and is free from
metals. The water is hard in character but its hardness and
its content of mineral and saline constituents in solution are
not excessive. It is of satisfactory organic quality and of a
high standard of bacterial purity.
These results are indicative of a water which is pure and
wholesome in character and suitable for drinking and domestic
purposes.