[Report 1967] / Medical Officer of Health, Darlington R.D.C.

  • Darlington (England). Rural District Council.
Date:
1967
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1967] / Medical Officer of Health, Darlington R.D.C. Source: Wellcome Collection.

    26/60 (page 24)
    Chemical Examination of Water Results in respect of water samples taken for chemical analysis were as follows:— Samples taken as a result of a complaint from occupier of 36 Durham Road, Coatham Mundeville: Results of Analysis of Sediment Appearance .. .. Dark brown flocculent matter Microscopical appearance Miscellaneous vegetable and mineral matter with the general appearance of mains silt Organic matter .. .. .. .. .. .. 35.1% Iron oxide (Fe203) .. .. .. .. .. 21.0% Manganese (Mn02) .. .. .. .. .. 11.6% Sulphates (S04) .. .. .. 10.1% Silica (Si02) 8.8 % Calcium carbonate (CaC03) .. .. .. .. 8.1% The amount of manganese in this deposit is a little unusual but apart from this the analysis is fairly typical of a mains deposit, or silt. A further sample was taken after the mains were flushed. The result was as follows:— Results of Analysis Appearance .. .. .. Clear and free from sediment Odour .. .. .. .. .. .. .. Normal pH value .. .. .. .. .. .. .. 7.7 Parts per million Total solid matter (dried at 180°C) .. .. .. 85 Nitrogen: as free and saline ammonia .. .. Nil as albuminoid ammonia .. .. .. 0.08 as nitrate .. .. .. .. .. Nil Hardness: Temporary .. .. .. .. .. 59 Permanent .. .. .. .. .. Nil Total 59 Chloride .. .. .. .. .. .. .. 16 Sulphate .. .. .. .. .. .. .. 18 Alkalinity .. .. .. .. .. .. .. 70 Oxygen absorbed from permanganate in 4 hours .. 0.24 Metals: Calcium.. .. .. .. .. .. 18 Magnesium .. .. .. .. .. 3 Sodium .. .. .. .. .. .. 4 Potassium .. .. .. .. .. ] Lead Nil Copper 0.2 Iron Nil Excess alkalinity .. 13 On this occasion the water was found to be completely free from the mains silt which was the cause of the previous complaint. It was of good chemical quality and satisfactory for all domestic purposes.