[Report 1957] / Medical Officer of Health, Bedford Borough.

  • Bedford Borough Council
Date:
1957
Catalogue details

Licence: Attribution 4.0 International (CC BY 4.0)

Credit: [Report 1957] / Medical Officer of Health, Bedford Borough. Source: Wellcome Collection.

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    A siinimaiy of chemical analyses of the raw water and the fully iR'ated water is gi\'en in the following table. HoKOiaUl Ol-' HkDFOIU) Wa I'ER ] )El’AJri\MEN'L' ( hlKMlCAL AxAI.YSKS, Y 1A R h]1) 1N G d 1 S'r December, 1 Raw water Treated water Range .Average Range Average Reaction (pH) 7.3-8.8 8.2 7.3-8.0 7.3 Tiirbiclity (silica scalt') 4-134 27 Less than 1.0 Less than 1.0 Colour (liazen units) 12-204 38 2-20 4 Carbonate hardness as CaC03 ... 153-270 232 138-253 218 Xon-carbonate hardness as CaC03 82-192 128 98-182 142 Total hardness 252-452 330 280-433 330 Free carbon dioxide 1.03-8.94 2.97 8.14-25.2 11.13 Total solids 420 300 523 — 530 Chlorine in Chlorides Electric Conductivity (reci])rocal 28 45 34 30-48 33 megohms per c.c. at 2{FC) Ammoniacal Nitrogen (free and 480-720 332 530-710 370 saline Ammonia) ... 0.01-0.53 0.03 Nil-0.2 0.004 .Albuminoid Nitrogen 0.13-1.33 0.34 0.03-0.23 0.103 Nitrogen in Nitrites — 0.03 Nil Nil Nitrogen in Nitrates 0.5-4.8 2.3 0.4-4.18 2.4 0.2 absorbed in 4 hrs. at 23.7' C — 1.4-3.3 3.1 0.3-2.0 1.2 Iron 0.01-0.2 0.03 Less than 0.02 Less than 0.02 Copper Trace Trace Nil-0.1 Less than 0.05 Lead Trace to Nil Nil Nil Nil Zinc Trace tc Nil Nil Nil Nil Calcium 93-130 131 102-130 131 Magnesium 5.3-12 7.9 5.0-12.5 7.9 Fluorine 0.11-0.33 0.21 0.11-0.35 0.2 Sodium as Na — 22 ■—- 20 Sulphates ... 84-193 138 115-190 140 Silica 2.4-17.0 8.5 — 8.1 Phosphates 0.24-0.7 0.39 0.19-0.72 0.31 ■Aluminium Anionic detergent (as Manoxol Nil Less than 0.1 T.ess than 0.1 O.T. after Longwell and Maniece) 0.10 to 0.45 0.24 Trace to 0.35 0.17 Results in parts per million. d'he following tables show the result of examinations undertaken at the Public Health Laboratory. pACTEKToiaxacAL Pesi l/l'S, P)5‘ FeLEA’ T |{EA'rEl) WaI'EIJ No. of samples of water in the course of distribution Presump tive conforms Faecal coliforms Pos. av. orgs. per 100 ml. Pos. av. orgs. per 100 ml. 151 4 4 — —