London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Chigwell 1968
[Report of the Medical Officer of Health for Chigwell]
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"Water Samples:
(a) Average results of Chemical Examination. Milligrammes per litre (unless otherwise stated):-
| Copper mills | Ferry Lane | Lee Bridge | Chingford Mill | Waltham Abbey | |
|---|---|---|---|---|---|
| No. of samples taken during the year | 33 | 3 | 52 | 4 | 4 |
| Ammoniacal Nitrogen | 0.021 | 0.014 | 0.025 | 0.142 | 0.170 |
| Albuminoid Nitrogen | 0.105 | 0.082 | 0.092 | 0.029 | 0.040 |
| Nitrate Nitrogen | 3.3 | 4.1 | 3,7 | 0.4 | 0.2 |
| Oxygen abs. from KMnO. 4 hours at 27°C | 1.24 | 1.11 | 1.15 | 0.33 | 0.18 |
| Hardness (total) CaCO3 | 314 | 371 | 316 | 276 | 286 |
| Hardness (non-carbonate) CaC03 | 98 | 149 | 96 | 59 | 76 |
| Magnesium as Mg | 6 | 6 | 6 | - | - |
| Sodium as Na | 33.5 | 33.5 | 33.5 | - | - |
| Potassium as K | 7.3 | 7.3 | 7.3 | - | - |
| Chloride as CI | 42 | 45 | 44 | 25 | 27 |
| Phosphate as PO4 | 2.7 | 2.4 | 2.8 | - | - |
| Silicate as SiO2 | 8 | 12 | 10 | - | - |
| Sulphate as SO4 | 96 | 96 | 96 | - | - |
| Natural Fluoride as F | 0.35 | 0.35 | 0.35 | 0.55 | 0.75 |
| Surface-active material as Manoxol OT | 0.03 | 0.03 | 0.03 | - | - |
| Turbidity units | 0.2 | 0.1 | 0.1 | 0.1 | 0.5 |
| Colour (Burgess units) | 13 | 7 | 14 | 2 | 8 |
| pH value | 8.2 | 7.7 | 8.1 | 7.5 | 7.5 |
| Electrical Conductivity (microhms) | 620 | 790 | 670 | 560 | 550 |
(b)
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