Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Islington, Parish of St Mary]
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WATER ANALYSIS.
In the following Tables I have stated the analyses (made monthly) of the New River Company's Water, and recorded by me during the year.
Analyses of Samples taken from the Works of the Company.
1882. | Total Solid Matter. | Chlorine. | Equal to Chloride of Sodium. | Nitrogen as Nitrates. | Nitrogen as Ammonia. | Oxygen required to oxidise Organic Matter. | Degree of Hardness. | Degree after boiling ¼ of an hour. | Organic Carbon. | Organic Nitrogen. |
---|---|---|---|---|---|---|---|---|---|---|
January | 22.00 | 1.08 | 1.77 | 0.188 | 0.001 | 0.066 | 17.05° | 4.2° | .. | .. |
February | 21.00 | 1.22 | 2.01 | 0.240 | 0 001 | 0.062 | 15.95° | 3.75° | .... | .. |
March | .. | 116 | 1.91 | 0.029 | 0.000 | 0.020 | 15.84° | .. | 0.079 | 0.010 |
April | 18.09 | 1.08 | 1.77 | 0.219 | 0.000 | 0.015 | 15.4° | 3.3° | .. | .. |
May | 19.00 | 1.224 | 2.006 | 0.208 | 0.000 | 0.040 | 15.4° | 2.4° | .. | .. |
June | 18.5 | 1.22 | 2.00 | 0.167 | 0.000 | 0.022 | 15.4° | 2.85° | .. | .. |
July | 19.00 | 1.224 | 2.006 | 0.167 | .. | 0.026 | 15.9° | 3.3° | .. | .. |
August | 17.4 | 1.33 | 2.18 | 0.156 | 0.000 | 0012 | 14.3° | 3.3° | .. | .. |
September | .. | 1.252 | 2.053 | 0.164 | 0.000 | 0.008 | 14.1° | .. | 0.011 | 0.013 |
October | 22.40 | 1.224 | 2.000 | 0198 | 0.000 | 0.018 | 15.4° | 3.3° | .. | .. |
November | 22.80 | 1.080 | 1.77 | 0.188 | 0.000 | 0.012 | 17.5° | 2.5° | .. | |
December | 24.00 | 1.224 | 2.006 | 0.229 | 0.000 | 0 040 | 16.0° | 4.1° | .. | .. |
Average | 17.01 | 1.193 | 1.915 | 0.179 | 0.000 | 0.028 | 15.7° | 2.7° | 0.045 | 0.059 |
A nalyses of S amples taken from the M ains of the C ompany.
1882. | Total Solid Matter. | Chlorine. | Equal to Chloride of Sodium. | Nitrogen as Nitrates. | Nitrogen as Ammonia. | Oxygen required to oxidise Organic Matter. | Degree of Hardness. | Degree after boiling ¼ of an hour. | Organic Carbon. | Organic Nitrogen. |
---|---|---|---|---|---|---|---|---|---|---|
.. | 0.000 | .. | ||||||||
.. | 16.70° | .. | 0.108 | 0.018 | ||||||
.. | .. | .. | .. | .. | .. | .. | .. | .. | .. | |
.. | 1.81 | .. | 0.010 | |||||||
.. | 0.016 | .. | ||||||||
.. | 0.169 | 0.018 | 16.9° | |||||||
.. | 0.000 | .. | 0.011 | |||||||
.. | .. | |||||||||
.. | .. | .. | .. | .. | .. | .. | .. | .. | .. | |
.. | 1.888 | 0.016 | .. | 0.018 | ||||||
.. | .. | 0.011 | ||||||||
.. | .. | |||||||||
.. | 0.201 | .. | 0.061 | 0.015 |