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29
Average Chemical Composition of the Metropolitan
Waters for the Year 1873.
Names of Water
Companies, &c.
Total
Solid
Matter
per
gallon.
Common
Salt.
Oxygen
required
by
Organic
Matter,
&c.
Nitrogen.
Hardness.
As
Nitrates,
&c.
As
Ammonia.
Before
Boiling.
After
Boiling.
Thames Water
Companies.
Grains.
Grains.
Grains.
Grains.
Grains.
Degrees.
Degrees.
Grand Junction
19.67
1.87
0.073
0.133
0.002
15.2
3.6
West Middlesex
18.77
1.81
0.035
0.135
0.001
14.6
3.4
Southwark and Vauxhall
19.41
1.85
0.067
0.122
0.002
15.0
3.6
Chelsea
19.29
1.82
0.079
0.123
0.002
15.0
3.0
Lambeth
19.28
1.83
0.073
0.117
0.002
14.9
3.6
Other Companies.
Kent
28.25
2.62
0.007
0.224
0.000
21.0
5.8
New River
19.13
1.73
0.033
0.134
0.000
14.9
3.3
East London
19.55
1.97
0.055
0.153
0.001
15.0
3.9
So that the average amount of saline matter in the
water derived from the Thames and supplied to the
Metropolis by the Grand Junction, the West Middlesex,
the Vauxhall, the Chelsea, and the Lambeth Companies,
has ranged from 18.77 to 19.67 grains per
imperial gallon. The water of the New River Company
has contained 19.13 grains of such matter per
gallon; that of the East London Company, from the
River Lea and the Thames, has averaged 19.55
grains; and that from the chalk wells of the Kent
Company has been 28.25 grains. The saline matter
has in all cases consisted for the most part of carbonate
of lime, with a little carbonate of magnesia,
sulphate of lime, nitrate of magnesia, and chloride of