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
Chislehurst 1963
[Report of the Medical Officer of Health for Chislehurst]
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Milligrammes per litre (unless otherwise stated).
| Description of the Sample | River Thames Southern Group | Bexley Well | Darenth Well | Eynsford Well | Horton Kirby Well | N. Orpington Well | Shortlands Well | Wilmington Well |
|---|---|---|---|---|---|---|---|---|
| No. of Samples | 156 | 9 | 5 | 7 | 8 | 8 | 11 | 3 |
| Ammoniacal Nitrogen | 0.20 | 0.007 | 0.010 | 0.003 | 0.007 | 0.008 | 0.012 | 0.016 |
| Albuminoid Nitrogen | 0.079 | 0.018 | 0.015 | 0.021 | 0.018 | 0.019 | 0.016 | 0.016 |
| Nitrate Nitrogen | 3.8 | 4.3 | 4.8 | 3.7 | 4.4 | 4.3 | 4.4 | 6.9 |
| Chlorides as Cl. | 32 | 19 | 18 | 15 | 19 | 14 | 17 | 23 |
| Oxygen abs. from KMnO4 4 hrs. at 27°C. | 1.18 | 0.10 | 0.02 | 0.02 | 0.06 | 0.02 | 0.04 | 0.20 |
| Turbidity Units | 0.3 | Nil | Nil | Nil | Nil | 0.3 | Nil | 0.1 |
| Colour (Burgess) scale | 10 | Nil | Nil | Nil | Nil | Nil | Nil | Nil |
| Hardness (Total) | 266 | 316 | 266 | 260 | 264 | 270 | 288 | 282 |
| Hardness (non-carbonate) | 66 | 70 | 32 | 30 | 40 | 26 | 62 | 44 |
| pH Value | 7.8 | 7.1 | 7.1 | 7.2 | 7.2 | 7.1 | 7.2 | 7.2 |
| Phosphate as PO4 | 1.3 | — | — | — | — | — | — | — |
| Silicate as SiO2 | 11 | — | — | — | — | — | — | — |
| Sulphate as SO4 | 62 | — | — | — | — | — | — | — |
| Magnesium as Mg | 5 | — | — | — | — | — | — | — |
| Natural Fluoride as F | 0.25 | — | — | — | — | — | .— | — |
| Free CO2 | — | — | — | — | — | — | — | - |
| Surface Active Material as Manoxol OT | 0.08 | - | - | - | -_ | - | - | - |
| B.O.D. 5 days at 20° C. | — | — | — | — | — | — | — | — |
| Sodium as Na. | — | 13.0 | 11.0 | 9.0 | 10.0 | 8.5 | 12.0 | 15.0 |
| Potassium as K. | — | 2.1 | 1.9 | 1.2 | 1.8 | 1.8 | 1.8 | 2.2 |
| Electrical Conductivity (Micromhos) | 550 | 580 | 480 | 470 | 490 | 480 | 520 | 550 |