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 | Ammoniacal Nitrogen | Albuminoid Nitrogen | Nitrate Nitrogen | Chlorides as CI | Oxygen abs. from Perman-ganate 4 hrs. at 27°C | Turbidity Units | Colour (Burgess Units) | Hardness (Total) Ca C03 | Hardness (non-carbonate) Ca CO3 | PH Value | Phosphate as P04 | Silicate as Si O2 | Sulphate as so4 | Natural Fluoride as F | Magnesium as Mg. | Sodium as Na | Potassium as K | Surface Active Material as Manoxol OT | Electrical Conductivity (micromhos) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
New River derived | 104 | 0.013 | 0.063 | 4.8 | 40 | 0.67 | 0.1 | 7 | 306 | 76 | 7.9 | 1.7 | 10 | 66 | 0.30 | 5 | 29.9 | 5.2 | 0.01 | 630 |
Park well | 13 | 0.076 | 0.028 | 0.8 | 0.28 | 0.1 | 0 | 272 | 62 | 7.6 | 0.75 | 530 | ||||||||
*Thames derived N. of River | 207 | 0.019 | 0.085 | 3.8 | 1.19 | 0.1 | 14 | 287 | 78 | 8.0 | 1.9 | 9 | 62 | 0.30 | 5 | 23.4 | 5.2 | 0.02 | 570 |
BEFORE TREATMENT | AFTER TREATMENT | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Number of samples | Agar plate count per mI | Coliform count | Escherichia Coli count | Number of samples | Agar plate count per mil. | CoIiform count | Escherichia Coli count | |||||
20-24 hours at 37°C | 3 days at 22ºC | 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 22ºC | Per cent samples negative in 100 ml. | Per cent samples negative in 100 ml. | |||
New River derived | 514 | 11.9 | 100.0 | 100.0 | ||||||||
Park well | 111 | 0.3 | 68 | 90.99 | 0.3 | 94.59 | 0.1 | 113 | 6.9 | 28 | 100.0. | 100.0 |
*Thames derived N. of River | 1,720 | 12.1 | 99.94 | 99.94 | ||||||||
*Ashford Common, Kempton Park, Hanworth and Barn Elms |