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 Haringey]
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(Milligrams per litre (unless otherwise stated))
Description of the Sample | No. of samples | Ammonia Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Chlorides as C1 | Oxygen abs. from Permanganate 4 hrs. at 27°C | Turbidity Units | Colour Burgess Units | Hardness (Total) | Hardness (non-car-bonate) | PH Value | Phosphate as P04 | Silicate as Si02 | Sulphate as S04 | Fluoride as F | Magnesium as Mg. | Surface Active Material as Manoxol | Electri- ical Conductivity (micro-mhos) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
New River derived | 104 | 0.053 | 0.065 | 5.7 | 42 | 0.72 | 0.1 | 7 | 302 | 66 | 7.7 | 1.4 | 12 | 60 | 0.25 | 5 | 0.07 | 610 |
Park well | 3 | 0.135 | 0.045 | 0.1 | 26 | 0.26 | 0.2 | 3 | 264 | 46 | 7.3 | 0.7 | 500 | |||||
Thames derived N. of River | 207 | 0.060 | 0.091 | 4.2 | 41 | 1.20 | 0.1 | 15 | 272 | 68 | 7.6 | 1.9 | 10 | 64 | 0.25 | 4 | 0.11 | 570 |
BEFORE TREATMENT | AFTER TREATMENT | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of samples | Agar plate count per ml. | Conform count | Escherichia coil count | Number of samples | Agar plate count per ml. | Coliform count | Escherichia coil count | |||||
20-24 hours at 37°C | 3 days at 22°C | Per cent samples negative in 100 ml. | Count per 100 ml. | Per cent samples negative in 100 ml. | Count per 100 ml. | 20-24 hours at 37°C | 3 days at 22°C | Per cent samples negative in 100 ml. | Per cent samples negative in 100 ml. | |||
New River derived | 514 | 6.4 | 100.0 | 100.0 | ||||||||
Park well | 62 | 0.8 | 62 | 85.48 | 0.5 | 90.32 | 0.2 | 63 | 0.5 | 38 | 100.00 | 100.0 |
Thames derived N. of River | 2046 | 7.4 | 99.95 | 100.0 |