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 1959
[Report of the Medical Officer of Health for Chislehurst]
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Milligrammes per litre (unless otherwise stated).
| Description of the Sample | Bexley | Eynsford | Orpington | North Orpington | Shortlands | Wilmington | Thames derived |
|---|---|---|---|---|---|---|---|
| No. of Samples | 4 | 8 | 4 | 4 | 13 | 5 | 386 |
| Ammonia Nitrogen | .008 | .009 | .010 | .014 | .009 | .012 | .030 |
| Albuminoid Nitrogen | .031 | .026 | .020 | .027 | .024 | .026 | .074 |
| Oxidised Nitrogen—Nitrite | — | — | — | — | — | - | - |
| Oxidised Nitrogen—Nitrate | 5.4 | 4.1 | 6.9 | 5.0 | 5.0 | 8.5 | 3.6 |
| Chlorides as Cl. | 18 | 16 | 16 | 14 | 16 | 22 | 28 |
| Oxygen abs. from Permanganate 4 hrs. at 27°C. | 0.10 | Nil | 0.02 | 0.06 | 0.06 | 0.08 | 1.04 |
| Turbidity in terms of Silica | Nil | Nil | Nil | Nil | Nil | Nil | 0.4 |
| Colour m.m. brown 2 ft. Tube Burgess's Tintometer | Nil | Nil | Nil | Nil | Nil | Nil | 9 |
| Hardness (Total) | 298 | 258 | 278 | 262 | 278 | 288 | 254 |
| Hardness (non-carbonate) | 60 | 34 | 44 | 30 | 64 | 58 | 56 |
| pH Value | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.1 | 7.8 |
| Phosphate as PO4 | — | — | — | — | — | — | 0.90 |
| Silicate as SiO2 | — | — | — | — | — | — | 9 |
| Potassium as K | 2.0 | 1.4 | 1.6 | 1.7 | 1.8 | 2.3 | - |
| Sulphate as SO4 | — | — | — | — | — | — | 54 |
| Fluoride as F | — | — | — | — | — | — | 0.2 |
| Magnesium as Mg | — | — | — | — | — | — | 4.0 |
| B.O.D. 5 days at 20°C. | — | — | — | — | — | — | - |
| Electrical Conductivity (gemmhos) | 575 | 475 | 525 | 475 | 525 | 550 | 525 |