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
Beckenham 1964
[Report of the Medical Officer of Health for Beckenham]
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-36
AVERAGE RESULTS
Milligrammes per litre (unless otherwise stated)
| Description of sample | Thames-derived South of River | Shortlands Well | West Wickham Well | Orpington |
|---|---|---|---|---|
| Number of samples | 159 | 11 | 4 | 4 |
| Ammoniacal nitrogen | 0.031 | 0.008 | 0.006 | 0.007 |
| Albuminoid nitrogen | 0.075 | 0.027 | 0.028 | 0.015 |
| Nitrate nitrogen | 5.0 | 5.2 | 5.7 | 6.9 |
| Chloride as Cl. | 34 | 18 | 15 | 16 |
| Oxygen abs. from KMno 4 hrs. at 27 C | 1.06 | 0.06 | 0.06 | 0.12 |
| Turbidity units | 1 | Nil | Nil | Nil |
| Colour (Burgess) scale | 11 | Nil | Nil | Nil |
| Hardness (total) | 264 | 284 | 266 | 284 |
| Hardness (non-carbonate) | 64 | 64 | 28 | 36 |
| pH value | 7.6 | 7.2 | 7.2 | 7.1 |
| Phosphate as Po4 | 1.0 | — | — | — |
| Silicate as Si02 | 9 | — | — | — |
| Sulphate as SO4 | 60 | — | — | — |
| Magnesium as Mg. | 5 | — | — | — |
| Surface-active material as Manoxol OT | 0.09 | — | — | — |
| Electrical conductivity (micromhos) | 550 | 520 | 480 | 510 |
| Natural fluoride as F. | 0.25 | 0.15 | 0.l | 0.1 |