Quantitative Analysis

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McGraw-Hill Book Company, 1914 - 511 pages

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Page 7 - Helium Holmium Hydrogen Indium Iodine Iridium Iron Krypton Lanthanum Lead Lithium Lutecium Magnesium Manganese Mercury...
Page 7 - Rh Rb Ru Sm Sc Se Si Ag Na Sr S Ta Te Tb Tl Th Tm Sn Ti W...
Page 295 - ... by again applying the flame of the taper as hereinbefore specified; if no flash occurs the test shall be repeated as often as the oil gains five degrees in temperature, three degrees with the lamp under the water bath, and two with the lamp removed.
Page 347 - Generally speaking, the shorter the time elapsing between the collection and the analysis of a sample, the more reliable will be the analytical results. Under many conditions, analyses made in the field are to be commended, as data so obtained are frequently preferable to those made in a distant laboratory after the composition of the water has changed en route. The allowable time that may elapse between the collection of a sample and the beginning of its analysis cannot be stated definitely, as...
Page 295 - Fahrenheit, the lamp shall be removed from under the water bath, and the oil shall then be allowed to rise to the temperature of one hundred degrees Fahrenheit by the residual heat of the water, and at that point the first test for flash shall be made as follows: A taper (hereinafter described) shall be lighted and the surface of the oil shall be touched with the flame of the taper (and it shall be lawful to apply this flame either to the center of the oil surface or to any or all parts of it) but...
Page 295 - ... and two degrees with the lamp removed. These tests shall be repeated until a flash is obtained. The inspector shall further test the oil by applying the taper at every two degrees rise, without removing the lamp or stirring; but if a flash is obtained by this means, by a less rise in temperature than five degrees herein required, he shall at once remove the lamp, stir the oil, and immediately apply the flame. The taper used for testing may be made of any wood, giving a clear flame, and it shall...
Page 310 - The acid value is a measure of the quantity of free fatty acids and is defined as the number of milligrams of potassium hydroxide required to neutralize the free fatty acids in one gram of substance.
Page 350 - Procedure. — Lower the rod vertically into the water as far as the wire can be seen and then read the level of the surface of the water on the graduated scale. This will indicate the turbidity.
Page 296 - ... be made to touch the oil, but the taper itself shall not be brought in contact with the oil: Provided, That, if the taper is so brought in contact with the oil, but not held there longer than for the space of one second, and the oil flashes, the test shall not thereby be vitiated, but the Inspector shall immediately remove the lamp, and again test the oil by the flame, without allowing the body of the taper to touch the oil.
Page 324 - C. ; if done at 20 add 0.0045 gram for each 10 cc. The melting point of arachidic acid thus obtained is between 71 and 72 C. Twenty times the weight of arachidic acid will give the approximate amount of peanut oil present. No examination for adulterants in olive oil is complete without making the test for peanut oil. Arachidic acid has a characteristic structure and can be detected by the microscope.

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