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 Twickenham]
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AVERAGE RESULTS GP THE CHEMICAL EXAMINATION OP WATER SUPPLIED TO THE BOROUGH OF TWICKENHAM
DURING I960
Milligrammes per litre (unless otherwise stated)
Description of the Sample | No. of samples | Ammonia Nitrogen | Albuminoid Nitrogen | Oxidised Nitrogen Nitrate | Chlorides as Cl | Oxygen abs. from Permanganate 4 hrs, at 27°C. | Turbidity units | Colour m.m. brown 2 ft. Tube BurgessDs Tintometer | Hardness (Total) | Hardness (non"carbonate) | pH Value | Phosphate as POt, | Silicate as S1O2 | Sulphate as SOtj | Fluoride as F | Magnesium as Mg | Surface Active Material as Manoxol | B.OcD* 5 days at 20^C | Electrical Conductivity (gemmhos) |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
River Thames derived | |||||||||||||||||||
(Southern Group) | 156 | 0.038 | 0.080 | 4.0 | 28 | 1.26 | 0.3 | 14 | 254 | 68 | 7.8 | 1.00 | 9 | 58 | 0.25 | 4 | 0.12 | 525 |
BACTERIOLOGICAL RESULTS - YEARLY AVERAGES,, 1960
Source of supply | After Treatment | ||||
---|---|---|---|---|---|
Number of Samp Ies | Agar plate count per ml„ | Coliform count | EoColi count | ||
20=24 hours at 37°CI | 3 days at 22°C* | Per cent» samples negative in 100 mlo | Per cento samples negative in 100 ml, | ||
River Thames derived (Southern Group) | 1,874 | 8,6 | 99.57 | 100o0 |
Table 7