[Report 1964] / Medical Officer of Health, Dunmow R.D.C.
- Great Dunmow (England). Rural District Council.
- Date:
- 1964
Licence: Attribution 4.0 International (CC BY 4.0)
Credit: [Report 1964] / Medical Officer of Health, Dunmow R.D.C. Source: Wellcome Collection.
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![Lee Valley Mater Company Tap in house 10 Copthall Close, G-reat Hallingbury Chemical Results in Parts Per Million tpearance: Bright with very slight Turbidity: less than 3 deposit. Microscopic exami nati on: f ew siliceous particles hour: Nil Odour: Nil i1 7.2 Pree Carbon Dioxide 35 Metric Conductivity 690 Dissolved Solids dried at 180 C 175 Lorine present as chloride 30 Alkalinity as Calcium Carbonate 300 hdness: Total 385 Garbona.te: 300 Non-carbonate 85 Ibrate Nitrogen 0.0 Nitrite Nitrogen absent Jnoniacal. L itrogen'- 0.02 Oxygen absorbed 0.20 ouminoid Nitrogen 0.03 Residual Chlorine absent [bals: Iron, Zinc, Copper & Lead absent To convert to Ammonia multiply by 1.21 of colonies developing n Agar Bacteriological Results „o. sumptive Coliform reaction :t. Coli (Type l) y. Relchii reaction 1 day at 37 C ... per ml. Present in ... per ml. ... ml. ... ml. 2 days at 37 C ... per ml. Absent from 100 ml. 100 ml. ... ml. 3 days at 20-22 C ... per ml. Probable number 0 per 3-00 ml. 0 per 100 ml. This sample is practically clear and bright in appearance, neutral in reaction free from metals. The water is very hard in character but contains no excess fmineral or saline constituents in solution. It conforms to the highest standard d organic quality and is also of very satisfactory bacterial purity. These results are indicative of a pure and wholesome water suitable for drinking domestic uses. h September, 1961. Counties Pub]/- :: health Laboratories](https://iiif.wellcomecollection.org/image/b29266166_0025.jp2/full/800%2C/0/default.jpg)
