London's Pulse: Medical Officer of Health reports 1848-1972
View report page
Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
Hackney 1966
[Report of the Medical Officer of Health for Hackney]
This page requires JavaScript
| Source of supply | No. of samples | Agar Plate Count per ml. after 20- 24 hours at 37°C | Coliform count per cent. samples negative in 100 ml. | E. Coli count per cent samples negative in 100 ml. |
|---|---|---|---|---|
| New River - Derived | 256 | 12.9 | 100.0 | 100.0 |
| All Thames - Derived | 3, 569 | 14.1 | 99.44 | 99.97 |
| New River-derived | All Thames derived | |
|---|---|---|
| No. of samples | 52 | 363 |
| Ammoniacal Nitrogen | 0.038 | 0.030 |
| Albuminoid Nitrogen | 0.069 | 0.088 |
| Nitrate Nitrogen. | 5.4 | 4.1 |
| Oxygen abs. from KMn04 4 hrs. at 27°C. | 0.74 | 1. 26 |
| Hardness (total) CaC03 | 315 | 285 |
| Hardness (non-carbonate) CaC03 | 82 | 78 |
| Magnesium as Mg | 4 | 5 |
| Sodium as Na | 27.8 | 24.5 |
| Potassium as K | 4.7 | 4.9 |
| Chloride as Cl | 36 | 32 |
| Phosphate as PO4. | 1. 4 | 1.7 |
| Silicate as Si02 | 10 | 8 |
| Sulphate as So4 | 64 | 64 |
| Natural Fluoride as F | 0. 20 | 0.20 |
| Surface - active material as Manoxol OT | 0.01 | 0.01 |
| Turbidity units | 0. 1 | 0.1 |
| Colour (Burgess units) | 9 | 15 |
| pH Value | 7.8 | 7.9 |
| Electrical Conductivity (microhms) | 630 | 570 |