Circular of the National Bureau of Standards, Issue 440U.S. Government Printing Office, 1942 |
From inside the book
Results 1-5 of 100
Page v
... mixing of samples - 115 2. Direct polarization_ 3. Clarification ( a ) General . ( b ) Alumina cream_ 116 119 119 119 ( c ) Basic lead acetate . 120 ( 1 ) Preparation . 120 ( 2 ) Analysis - 121 ( 3 ) Correction for volume of precipitate ...
... mixing of samples - 115 2. Direct polarization_ 3. Clarification ( a ) General . ( b ) Alumina cream_ 116 119 119 119 ( c ) Basic lead acetate . 120 ( 1 ) Preparation . 120 ( 2 ) Analysis - 121 ( 3 ) Correction for volume of precipitate ...
Page 54
... mixed with mercury to make a soft alloy , the cracking of the lamp is effectively prevented , but the mercury vapor then carries most of the current , since the vapor pressure of mercury is much greater than that of cadmium . On the ...
... mixed with mercury to make a soft alloy , the cracking of the lamp is effectively prevented , but the mercury vapor then carries most of the current , since the vapor pressure of mercury is much greater than that of cadmium . On the ...
Page 108
... mixing by shaking , with no loss by spilling . ( 3 ) SPECIAL . A number of flasks designed for special purposes are shown in figure 30 . Flask 1 is the Bates - type sugar flask , specifications of which are given above . This flask is ...
... mixing by shaking , with no loss by spilling . ( 3 ) SPECIAL . A number of flasks designed for special purposes are shown in figure 30 . Flask 1 is the Bates - type sugar flask , specifications of which are given above . This flask is ...
Page 109
... mixing of the contents of the flask without the solution coming in contact with the grinding or the thumb until the mixing is complete . Before making to volume , the bulb is dried inside by a current of filtered air . The glass tube is ...
... mixing of the contents of the flask without the solution coming in contact with the grinding or the thumb until the mixing is complete . Before making to volume , the bulb is dried inside by a current of filtered air . The glass tube is ...
Page 115
... MIXING OF SAMPLES The importance of a correct method of sampling raw sugar cannot be overestimated . If this step is carelessly or erroneously carried out , the most careful work on the part of the chemist is vitiated . The details of ...
... MIXING OF SAMPLES The importance of a correct method of sampling raw sugar cannot be overestimated . If this step is carelessly or erroneously carried out , the most careful work on the part of the chemist is vitiated . The details of ...
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Common terms and phrases
acetate added alpha amount analysis analyzer apparatus aqueous azimuth beaker beam beta boiling Brix Bureau of Standards calcium calculated cell CH₂OH Chem chloride coefficient color components concentration configuration constant containing cooled copper correction crystalline crystals decolorizing carbon determined deut dextrose dilute direction dissolved distilled electrode equation equilibrium evaporated FIGURE filter filtrate flask galactose glass glycosides grams HCOH heating hydrochloric acid hydrogen hydrolysis instrument invert sugar invertase Isbell lactose lamp levulose liquid measurements mercury method methyl alcohol mixture modifications molasses mutarotation nicol nicol prism normal weight obtained optical rotation oscillation oxide percent plane polarized polariscope polarized light potassium precipitate prism procedure pyranose quantity quartz quartz control plates raffinose reaction reducing sugars refracting saccharimeter sample sirup sodium sodium hydroxide solubility specific rotation sucrose sugar solution sulfate sulfuric acid temperature thickness tion titration tube turbidity vacuo volume washed wave length
Popular passages
Page 382 - NOTE. — For the purpose of interpreting these specifications the following definitions apply: The total length is the over-all length of the finished instrument. The diameter is that measured with a ring gage. The length of the bulb is the distance from the bottom of the bulb to the beginning of the enamel backing. The top of the thermometer is the top of the finished instrument.
Page 158 - If the analyst is in doubt as to the completion of the hydrolysis, allow a portion of the solution to remain for several hours and again polarize. If there is no change from the previous reading, the inversion is complete, and the reading and temperature of the solution should be carefully noted.
Page 181 - Titrate at once with the thiosulphate solution until the brown tinge has become weak, then add sufficient starch liquor to produce a marked blue coloration. Continue the titration cautiously until the color due to free iodin has entirely vanished.
Page 768 - ... to test the correctness of saccharimeters ; for those who execute commercial analyses, the repeated control of the instruments is to be accomplished, now as before, by quartz plates. 4. In effecting the polarization of substances containing sugar, half-shade instruments, or triple field, only are to be employed.
Page 177 - By consulting the table it will be seen that the vertical column headed 150 is nearest to Z, 145, and the horizontal column headed 95 : 5 is nearest to the ratio of R to I, 95.1 : 4.9.
Page 782 - ... not imported to be commercially used for the extraction of sugar, or for human consumption...
Page 776 - After bringing the solution exactly to the mark at the proper temperature, and after wiping out the neck of the flask with filter paper, pour all of the wellshaken clarified sugar solution on a rapidly acting filter. Reject the first portions of the filtrate and use the rest, which must be perfectly clear for polarization.
Page 667 - If the number is less than 1, make the characteristic of the logarithm negative, and one unit more than the number of zeros between the decimal point and the first significant figure of the given number.
Page 789 - ... test of the importation and also the quantity and test of each lot from which such average test is obtained.
Page 787 - Receptacles — How sampled. — Sugar in hogsheads and other wooden packages shall be sampled by putting the long trier diagonally through the package from chime to chime, one trierful to constitute a sample, except in small lots, when an equal number of trierfuls shall be taken from each package to furnish the required amount of sugar necessary to make a sufficient sample. In the sampling of baskets, bags, seroons, and mats the short trier shall be used, care being exercised to have each sample...