Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[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
1960
Milligrammes per litre (unless otherwise stated).
Description of the Sample | Bexley | Darenth | Eynsford | Horton Kirby | Orpington | North Orpington | Shortlands | Wilmington | Thames derived |
---|---|---|---|---|---|---|---|---|---|
No. of Samples | 4 | 6 | 7 | 6 | 4 | 4 | 12 | 3 | 156 |
Ammonia Nitrogen | 0.011 | 0.011 | 0.013 | 0.012 | 0.015 | 0.013 | 0.016 | 0.012 | 0.038 |
Albuminoid Nitrogen | 0.016 | 0.022 | 0.020 | 0022 | 0.021 | 0.023 | 0.026 | 0.028 | 0.080 |
Oxidised Nitrogen—Nitrite | - | - | - | - | - | - | - | - | - |
Oxidised Nitrogen—Nitrate | 5.8 | 5.5 | 4.1 | 4.5 | 6.6 | 5.0 | 5.3 | 7.8 | 4.0 |
Chlorides as CI. | 18 | 17 | 16 | 17 | 15 | 14 | 18 | 22 | 28 |
Oxygen abs. from Permanganate 4 hrs. at 27°C. | 0.10 | 0.06 | 0.06 | 0.04 | 0.04 | 0.04 | 0.04 | 0.10 | 1.26 |
Turbidity Units | Nil | 0.7 | Nil | Nil | Nil | 0.1 | Nil | Nil | 03 |
Colour mm. brown 2 ft. Tube Burgess's Tintometer | Nil | Nil | Nil | Nil | Nil | Nil | Nil | Nil | 14 |
Hardness (Total) | 286 | 268 | 258 | 258 | 278 | 266 | 282 | 284 | 254 |
Hardness (non-carbonate) | 50 | 40 | 32 | 38 | 42 | 30 | 64 | 54 | 68 |
pH Value | 7.2 | 7.2 | 7.3 | 7.2 | 7.1 | 7.1 | 7.2 | 7.1 | 7.8 |
Phosphate as PO | - | - | - | - | - | - | - | - | 1.00 |
Silicate as SiO2 | - | - | - | - | - | - | - | 9 | |
Sulphate as SO 4 | 32 | 22 | 16 | 20 | 16 | 12 | 44 | 30 | 58 |
Fluoride as F | 0.1 | 0.2 | 0.2 | 0.15 | 0.1 | 0.1 | 0.15 | 0.13 | 0.25 |
Magnesium as Mg | - | - | - | - | - | - | - | - | 4 |
Surface Active Material as | |||||||||
Maroxol | - | - | - | - | - | - | - | - | 0.12 |
Free CO2 | 35 | 35 | 32 | 30 | 38 | 36 | 31 | 38 | - |
Electrical Conductivity (gemmhos) | 500 | 500 | 475 | 475 | 500 | 475 | 525 | 550 | 525 |