Standard methods for the examination of water and sewageAmerican Public Health Association, 1920 - 115 pages |
Common terms and phrases
Acidify Add 10 cc Add 5 cc agar alkaline aluminium ammonia ammonia nitrogen ammonia-free water ammonium hydroxide amyl alcohol boiled distilled water bottle calcium carbonate carbon dioxide cent alcohol Chem chloride containing cool cubic centimeters determination digestion dilute sulfuric acid dilute the solution diluted to 50 Dissolve distilled water equal equivalent Evaporate to dryness fermentation tubes filter filtrate flask gas-formation grams of potassium heat hot water hydrochloric acid hydrogen sulfide ignite incubation iodine liquid liter of distilled magnesium manganese method methyl orange million of calcium minutes N/50 sulfuric acid Nessler tube neutral nitrate solution nitric acid nitrogen number of cubic odor organic matter oxide percentage PERMANENT STANDARDS phenolphthalein plates platinum dish potassium permanganate potassium sulfide precipitate present Procedure quantity Reagents.-1 salt sample saturated sewage sludge small amount soap solution sodium carbonate sodium hydroxide sodium nitrate standard solution sterilized sulfuric acid temperature tion turbidity wash weight zinc
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Page 18 - 50 grams of potassium iodide in a minimum quantity of cold water. Add a saturated solution of mercuric chloride until a slight precipitate persists permanently. Add 400 cc. of 50 per cent solution of potassium hydroxide, made by dissolving the potassium hydroxide and allowing it to clarify by sedimentation before using. Dilute to
Page 27 - evolved hydrogen escapes freely. The small amount of ammonia escaping into the trap may be neglected. Allow the action to proceed for a minimum period of four hours or over night. Pour the contents of the tube into a distilling flask, dilute with 250 cc. of ammonia-free water, distill,
Page 50 - of purest potassium permanganate in about 100 cc. of distilled water. Acidify the solution with sulfuric acid and heat to boiling. Add slowly a sufficient quantity of dilute solution of oxalic acid to discharge the color. Cool and dilute to 1 liter. One cc. of this solution contains 0.1 mg. of manganese.
Page 44 - so that 1 cc. will be exactly equivalent to 0.0005 gram of chloride. 3. Potassium chromate indicator. Dissolve 50 grams of neutral potassium chromate in a little distilled water. Add enough silver nitrate to produce a slight red precipitate. Filter and dilute the filtrate to 1 liter with distilled water. 4.
Page 18 - liter, allow to settle, and decant. This solution should give the required color with ammonia within five minutes after addition and should not produce a precipitate with small amounts of ammonia within two hours.
Page 110 - ROUTINE PROCEDURE FOR EXAMINATION OF SAMPLES OF WATER. First Day: 1. Prepare dilutions as required. 2. Make two (2) gelatin plates from each dilution, and incubate at 20° C. 4. Inoculate lactose broth fermentation tubes with appropriate amounts for B. coli tests, inoculating two (2) tubes with each amount.
Page 29 - If the sample contains both oxidizable mineral compounds and gaseous organic substances the latter should be driven off by heat and the sample allowed to cool before applying this test for the correction factor. If such corrections are made the fact should be stated with the amount of correction. Period and temperature of
Page 37 - or similar glass Erlenmeyer flasks. Treat the contents of each flask in the following manner. Boil 15 minutes to expel free carbon dioxide. Add 25 cc. of soda reagent. Boil 10 minutes, cool, rinse into 200 cc. graduated flasks, and dilute to 200 cc. with boiled
Page 11 - and by comparing it with the standards. The observation shall be made by looking vertically downward through the tubes upon a white or mirrored surface placed at such angle that light is reflected upward through the column of liquid.
Page 111 - lactose-litmus-agar plates. If typical colonies have developed, select two and transfer each to a lactose broth fermentation tube and an agar slant, both of which are to be incubated at 37° C. 2. If no typical B. coli colonies are found, incubate the plates another 24 hours. Fifth Day: