A manual of practical hygiene / by Edmund A. Parkes ; edited by F.S.B. Francois de Chaumont.

Date:
1887
Catalogue details

Licence: Public Domain Mark

Credit: A manual of practical hygiene / by Edmund A. Parkes ; edited by F.S.B. Francois de Chaumont. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

    757/838 (page 705)
    CLASSIFICATION—SUSPICIOUS WATER. 3. Suspicious Water. 705 Character or Constituents. Remarks. Physical characters, Yellow or strong gi'een colour; tuibid; sus- pended matter con- siderable; no smell, but any marked taste. Chemical Constituents. 1. Chlorine in chlorides, 2. Solids in solution : total, ,, ,, volatile, 3. Ammonia, free or saline, ,, albuminoid, 4. Nitric acid (NO3), in nitrates. Nitrous acid (NOg), in nitrites. Nitrogen in nitrates and nitrites, . . . . Total combined nitrogen, in- cluding that in free am- monia, .... Total nitrogen, including that in albuminoid am- monia, .... 5. Oxygen absorbed by organic matter within half an hour by permanganate and acid, at 140° F. (80° C.), . Do. do. in 15 minutes, at 80° F. (27° C), Do. do. in 4 hours, at 80° F. (27° C), 6. Hardness, total, . above ,, fixed, . above 7. Phosphoric acid in phos- phates, .... Sulphuric acid in sul- phates, . . above 8. Heavy metals—iron, 9. Hydrogen sulphide, alkaline sulphides, .... Microscopic characters, Grains per gallon, 1 in 70,000. 3 30 3 0 0 0 0 0 0 0 to 5 to 50 to 5 ■0035 to •0070 •0070 to ■0087 •35 to ■70 ■0350 Centi- grammes per litre, 1 in 100,000. 0^0870 to 0^1661 ©•0871 to 0^1718 0^0879 to 0^]726 0-0700 to 0-1050 4 to 7 43 to 71 4 to 7 0-0050 to 0-0100 0-0100 to 0-0125 0^5 to 1^0 0^0500 0^1243 to 0^2373 0^1247 to 0-2455 0-1255 to 0-2465 0-1000 to 0-1500 0-0350 to 0-0500 to 0-0700 0-1000 0^1500 to 0-2000 to 0-2800 0-4000 12°-0 17°-0 4°-0 5°-7 heavy traces 2-000 3-000 traces traces nil nil Vegetable and animal forms more or less pale and colourless; organic debris ; fihrcs of clntli- ing, or other evidence of liouse refuse. Where the impurity is mostly vegetable, the colour may be very marked in usable water. In some cases the chlor- ine may be greater. / This may sometimes be \ larger. A water .such as the above ought to excite suspicion ; its iise ought to be suspended until mquiries about it can be made; if it must be used, it ought to be boiled and filtered 2 y'