Water-analysis: A Practical Treatise on the Examination of Potable Water

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Page 67 - ... parts per million, the water belongs to the class of very pure water. When the albuminoid ammonia amounts to .05, then the proportion of free ammonia becomes an element in the calculation ; and I should be inclined to regard with some suspicion a water yielding a considerable quantity of free ammonia along with more than .05 parts of albuminoid ammonia per million.
Page 2 - A Practical Treatise on the Examination of Milk and its Derivatives, Cream, Butter and Cheese.
Page 35 - The weaker solution, which therefore contains -jJ-^ milligramme of ammonia in one cubic centimetre, is generally useful. (3) The solution of Potash and Permanganate of Potash is made by dissolving 200 grammes of solid potash and 8 grammes of crystallised permanganate of potash in a litre of water. The solution is boiled for some time, in order to get rid of all traces of ammonia and organic nitrogenous matter ; and after about one quarter of the liquid has boiled off, it may be filled up with pure...
Page 32 - ... particular from that described in 1867. The ammonia-process, like the permanganate-process above described — and as every adequate method for the determination of its organic matter in water must do — operates on the water itself, and not on the residue got on evaporation. The principle of the method is measurement of the nitrogenous organic matter in waters by the quantities of ammonia yielded by the destruction of the organic matter.
Page 49 - When the free ammonia exceeds 0.08 parts per million, it almost invariably proceeds from the fermentation of urea into carbonate of ammonia, and is a sign that the water in question consists of diluted urine in a very recent condition. In these instances the water will likewise be found to be loaded with chlorides.
Page 67 - ... .02 or to less than .05 parts per million the water belongs to the class of very pure water. When the albuminoid ammonia amounts to .05 then the proportion of free ammonia becomes an element in the calculation; and I should be inclined to regard with some suspicion a water yielding a considerable quantity of free ammonia along with .05 parts of albuminoid ammonia per million.
Page 34 - ... and it remains to render it sufficiently alkaline, and to render it sensitive. This is accomplished by adding 160 grammes of solid caustic potash, or 120 grammes of caustic soda, to the liquid, which is afterwards to be diluted with water, so that the whole volume of the solution may equal one litre. In order to render the Nessler reagent sensitive, it is mixed finally with a little more cold saturated solution of corrosive sublimate, and allowed to settle.
Page 68 - Albuminoid ammonia above o.Io per million begins to be a very suspicious sign ; and over 0.15 ought to condemn a water absolutely. The absence of chlorine or the absence of more than one grain of chlorine per gallon, is a sign that the organic impurity is of vegetable rather than of animal origin, but it would be a great mistake to allow water highly contaminated with vegetable matter to be taken for. domestic use.
Page 141 - ... in alkaline solutions is very remarkable and characteristic. Urea, when quite pure, may be boiled for a long time with alkalies without evolving a trace of ammonia ; and even when impure, though slowly decomposed, yet the decomposition is exceedingly slow. But at temperature some way above 100° c., the decomposition is very rapid and complete. In presence of permanganate and excess of potash, urea is doubtless decomposed, but it yields no ammonia, which is a very extraordinary and noteworthy...
Page 42 - ... milligramme. In the instance of the albuminoid ammonia, it is necessary to Nesslerise each separate 50 cc of distillate, and to add the amounts together, in order to arrive at the total albuminoid ammonia. Since half a litre of water is taken for the analysis, the results must be multiplied by two, in order to make them count upon the litre ; and if that be done, we shall then have the " free ammonia " and " albuminoid ammonia " expressed in milligrammes per litre, or in parts per million (which...

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