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 1961
[Report of the Medical Officer of Health for Chislehurst]
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Milligrammes per litre (unless otherwise stated).
| Description of the Sample | Southern Group | Bexley | Darenth | Eynsford | Horton Kirby | North Orpington | Shortlands | Wilmington |
|---|---|---|---|---|---|---|---|---|
| No. of Samples | 156 | 4 | 4 | 8 | 8 | 5 | 8 | 3 |
| Ammonia Nitrogen | 0.041 | 0.020 | 0.022 | 0.022 | 0.021 | 0.017 | 0.019 | 0.023 |
| Albuminoid Nitrogen | 0.076 | 0.043 | 0.033 | 0.031 | 0.039 | 0.037 | 0.041 | 0.041 |
| Oxidised Nitrogen—Nitrite | — | — | — | — | — | — | — | — |
| Oxidised Nitrogen—Nitrate | 4.1 | 5.9 | 4.5 | 4.1 | 4.8 | 4.7 | 4.6 | 9.0 |
| Chlorides as Cl. | 27 | 17 | 17 | 16 | 17 | 14 | 18 | 23 |
| Oxygen abs. from Permanganate 4 hrs. at 27°C. | 1.06 | 0.14 | 0.08 | 0.04 | 0.08 | 0.08 | 0.04 | 0.14 |
| Turbidity Units | 0.2 | Nil | Nil | Nil | Nil | 0.1 | Nil | 1.0 |
| Colour m.m. brown 2 ft. Tube Burgess's Tintometer | 13 | Nil | Nil | Nil | Nil | Nil | Nil | 3 |
| Hardness (Total) | 262 | 292 | 270 | 270 | 260 | 274 | 284 | 298 |
| Hardness (non-carbonate) | 52 | 48 | 28 | 30 | 32 | 28 | 52 | 54 |
| pH Value | 7.9 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 | 7.2 |
| Phosphate as PO4 | 1.0 | — | — | — | — | — | — | — |
| Silicate as SiO3 | 9 | — | — | — | — | — | — | — |
| Sulphate as SO4 | 50 | — | — | — | — | — | — | — |
| Fluoride as F | 0.20 | — | — | — | — | — | — | — |
| Magnesium as Mg | 6 | — | — | — | — | — | — | — |
| Surface Active Material as Manoxol | 0.11 | — | — | — | — | — | — | — |
| Free CO2 | — | 37 | 34 | 32 | 31 | 40 | 30 | 37 |
| Electrical Conductivity (Micro-mhos) | 525 | 550 | 500 | 475 | 500 | 500 | 525 | 550 |