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 Beckenham]
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AVERAGE RESULTS OF THE CHEMICAL EXAMINATION OF WATER SUPPLIED TO THE BOROUGH OF BECKENHAM DURING 1961
Milligrammes per litre (unless otherwise stated)
Description of Samples | Thames-derived Southern Group | Shortlands | West Wickham | Orpington |
---|---|---|---|---|
Number of Samples | 156 | 8 | 4 | 4 |
Ammonia Nitrogen | 0. 041 | 0.019 | 0.015 | 0.018 |
Albuminoid Nitrogen | 0. 076 | 0 .041 | 0 .036 | 0 .040 |
Oxidised Nitrogen—Nitrite | — | — | — | — |
Oxidised Nitrogen—Nitrate | 4.1 | 4.6 | 5.2 | 6.8 |
Chlorides as CI. | 27 | 18 | 13 | 18 |
Oxygen abs. from Permanganate (4 hrs. at 27°C.) | 1.06 | 0.04 | 0.10 | 0.18 |
Turbidity Units | 0.2 | Nil | Nil | Nil |
Colour mm. brown 2 ft. Tube (Burgess's Tintometer).. | 13 | Nil | Nil | Nil |
Hardness (Total) | 262 | 284 | 272 | 300 |
Hardness (non-carbonate) | 52 | 52 | 28 | 60 |
pH Value | 7.9 | 7.2 | 7.2 | 7.2 |
Phosphate as P04 | 1.0 | — | — | — |
Silicate as SiO2 | 9 | — | — | — |
Surface active material as Manoxol | 0.11 | — | — | — |
Sulphate as SO2 | 50 | — | — | — |
Natural Fluoride as F. | 0.20 | — | — | — |
Magnesium as Mg. | 6 | — | — | — |
Free CO2 | — | 30 | 32 | 38 |
Electrical Conductivity micromhos | 525 | 525 | 475 | 550 |