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 1962
[Report of the Medical Officer of Health for Chislehurst]
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Average Results of the Chemical Examination of the water supplied to the Urban District of Chislehurst and Sidcup during
1962
Milligrammes per litre (unless otherwise stated).
| Description of the Sample | River Thames Southern Group | Bexley | Darenth | Eynsford | Horton Kirby | North Orpington | Short lands | Wilmington |
|---|---|---|---|---|---|---|---|---|
| No. of Samples | 156 | 4 | 4 | 8 | 8 | 7 | 10 | 4 |
| Ammonia Nitrogen | 0.042 | 0.011 | 0.01 | 0.013 | 0.015 | 0.013 | 0.013 | 0.017 |
| Albuminoid Nitrogen | 0.076 | 0.031 | 0.023 | 0.026 | 0.027 | 0.021 | 0.024 | 0.033 |
| Oxidised Nitrogen—Nitrite | — | — | — | — | — | — | — | — |
| Oxidised Nitrogen—Nitrate | 4 | 5.5 | 5.3 | 3.7 | 4.2 | 3.9 | 4.4 | 9.3 |
| Chlorides as CI. | 31 | 19 | 17 | 16 | 18 | 14 | 18 | 23 |
| Oxygen abs. from Permanganate 4 hrs. at 27°C. | 1.12 | 0.1 | 0.1 | 0.04 | 0.1 | 0.06 | 0.08 | 0.14 |
| Turbidity Units | 0.2 | Nil | Nil | Nil | Nil | 0.2 | Nil | Nil |
| Colour m.m. brown 2 ft. Tube Burgess's Tintometer | 12 | Nil | Nil | Nil | Nil | 2 | Nil | Nil |
| Hardness (Total) | 256 | 318 | 266 | 264 | 264 | 266 | 282 | 292 |
| Hardness (non-carbonate) | 58 | 68 | 26 | 28 | 36 | 20 | 54 | 48 |
| pH Value | 7.8 | 7.2 | 7.2 | 7.3 | 7.3 | 7.2 | 7.2 | 7.2 |
| Phosphate as PO4 | 1.3 | — | — | — | — | — | — | — |
| Silicate as SiOa | 10 | — | — | — | — | — | — | — |
| Surface Active Material as Manoxol | 0.12 | _ | _ | _ | — | — | — | — |
| Sulphate as SO4 | 61 | — | — | — | — | — | — | — |
| Fluoride as F ... | 0.25 | — | — | — | — | — | — | — |
| Magnesium as Mg | 6 | — | — | — | — | — | — | — |
| Electrical Conductivity (Micro-mhos) | 550 | 580 | 500 | 470 | 490 | 480 | 530 | 550 |