The Analyst, Volumes 20-21

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Royal Society of Chemistry, 1895 - Chemistry, Analytic
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Page 301 - I, the undersigned, public analyst for the do hereby certify that I received on the day of 18 , fromf , a sample of for analysis (which then weighed]: ), and have analysed the same, and declare the result of my analysis to be as follows...
Page 50 - Here the analyst may insert at his discretion his opinion as to whether the mixture (if any) was for the purpose of rendering the article portable or palatable, or of preserving it, or of improving the appearance, or was unavoidable, and may state whether in excess of what is ordinary, or otherwise, and whether the ingredients or materials mixed are or are not injurious to health.
Page 87 - ... with chlorides. Much albuminoid ammonia (which generally comes over slowly), little free ammonia, and almost entire absence of chlorides, is indicative of vegetable contamination, and is exemplified by the well at the Leek Workhouse. Such water is very injurious to health.* The analytical characters, as brought out by the ammonia process, are very distinctive of good and bad waters, and are quite unmistakable.
Page 50 - ... unavoidable, and may state whether in excess of what is ordinary, or otherwise, and whether the ingredients or materials mixed are or are not injurious to health. In the case of a certificate regarding milk, butter, or any article liable to decomposition, the analyst shall specially report whether any change had taken place in the constitution of the article that would interfere with the analysis.
Page 87 - in soluble, vegetable, and animal organic matters vary in opposite directions during oxidation, — a fact which renders more difficult the decision as to whether the organic matter present in any given sample of water is of animal or vegetable origin." All nitrogenous organic matter, whether of vegetable or animal origin, yields more or less ammonia when boiled with a strongly alkaline solution of permanganate of potash, and the ammonia so yielded by potable waters is called " albuminoid," or "...
Page 100 - ... water supplies. The results gave evidence of the multifarious character of the organisms in question, and illustrated the need for caution against drawing general conclusions from the results of cultivating water organisms by any single method. In the same year Dr. Dupre, FRS, reported to the Board on changes effected in the aeration of certain waters by the life processes of particular micro-organisms under different conditions of temperature, light, and nutrient material, but the results obtained...
Page 81 - ... who rarely hesitate to pass judgment upon a water from the determination of the chlorides, nitrates, phosphates and ammonia, of the organic carbon and nitrogen, of the oxygen consumed, and of the ammonia derivable from the organic constituents. All these factors are of more or less importance as an index of the degree of pollution, recent or remote, but their real value can in very few cases be assessed without some previous knowledge of the source of the water. The inorganic constituents can...
Page 74 - PROCEDURE : 5 gm. of the pulverized ore are treated with 100 cc of concentrated hydrochloric acid in a covered beaker, using a gradually increasing heat, and adding more acid if necessary. When there is no further action, 50 cc of a mixture of equal volumes of sulphuric acid and water are added, and the liquid evaporated until it fumes strongly. After cooling, 200 cc of water are added, the whole heated until the sulphates dissolve, and the liquid filtered into a liter flask.
Page 90 - ... can be used with safety. In commenting upon a recent paper in which I expressed these views, a writer in the Chemist and Druggist says : " It would seem, therefore, that we are face to face with the question, ' Is water analysis a failure ?' It has been so exclusively the province of chemical analysts to pronounce judgment upon domestic waters, and they generally have given so little attention to the large issues attached to analysis, and so very much to sets of standard figures for chlorine,...
Page 195 - Portland cement, or other cement of equal quality, to be approved by the district surveyor, mixed with clean sharp sand or grit, in the proportions of one of cement to four of sand or grit. Burnt ballast or broken brick may be substituted for sand or grit, provided such material be properly mixed with lime in a mortar mill. Every wall of a house or building shall have a damp course...

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