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 Orpington]
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25.
Average Results of the Chemical Examination of the waters supplied to the Orpington Urban District Council
MILLIGRAMMES PER LITRE (unless otherwise stated)
Description of the Sample | Sundridge Well | Lullingstone Well | Eynsford Well | Horton Kirby Well | Orpington Yell | North Orpingto Well |
---|---|---|---|---|---|---|
No. of Samples | 15 | 8 | 8 | 8 | 4 | 8 |
Ammoniacal Nitrogen | 0.005 | 0.005 | 0.001 | 0.003 | 0.007 | 0.006 |
Albuninoid Nitrogen | 0.020 | 0.014 | 0.018 | 0.022 | 0.015 | 0.016 |
Nitrate Nitrogen | 3.2 | 4.0 | 4.2 | 4.8 | 6.9 | 4.8 |
Chlorides as C1. | 18 | 15 | 16 | 19 | 16 | 14 |
Oxygen abs from KMn04 4 hrs. at 27°C. | 0.06 | 0.09 | 0.08 | 0.04 | 0.12 | 0.06 |
Turbidity units | Nil | Nil | Nil | Nil | Nil | Nil |
Colour (Burgess) scale | Nil | Nil | Nil | Nil | Nil | Nil |
Hardness (total) | 214 | 254 | 260 | 264 | 284 | 268 |
Hardness (non- Carbonate) | 42 | 24 | 28 | 40 | 36 | 24 |
pH Value | 7.4 | 7.3 | 7.3 | 7.3 | 7.1 | 7.2 |
(Phosphate as P04 | ||||||
Silicate as Si02 | ||||||
Sulphate as SO 4 | -........ | |||||
Magnesium as Hg. | ||||||
Natural Fluoride as F. | 0.15 | 0.15 | 0.2 | 0.15 | 0.1 | 0.1 |
Free C02 | ||||||
Surface-active material as Manaxol OT | . | |||||
B.O.D, 5 days at 20oC. | ||||||
Electrical Conductivity (micromhos) | 410 | 450 | 470 | 480 | 510 | 480 |