Quantitative Chemical Analysis, Band 2J. Wiley & Sons, 1915 |
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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
according to Vol acetic acid acidulate alcohol alkali ammonia ammonium analysis analyt antimony apparatus arsenic ascertain barium barium chloride beaker boiling bromine calcium calcium-chloride tube calculated carbon dioxide carbonic acid cent Chem chloric acid chloride color combustion tube compounds containing copper crucible cupric oxide decomposed determine dilute dish dissolve distilled dried dryness employed evaporate excess ferrous filled filter filtrate flask fused glass tube heat hydrochloric acid hydrogen sulphide hydroxide Ibid ignite insoluble iodine iron Journ latter lead lime liquid litre magnesium manganese mercury metals method mixture neutralize nickel nitrate nitric acid nitrogen obtained organic matter oxalate oxygen permanganate phosphate phosphoric acid platinum porcelain portion potassium potassium chlorate powder precipitate present pure residue salt separate silicic acid silver small quantity soda solution soda-lime sodium carbonate stopper substance sulphate sulphuric acid temperature tion treat volume wash water-bath weighed Zeitschr zinc
Beliebte Passagen
Seite 1055 - The clear, supernatant fat is poured off and filtered through a dry filter-paper in a jacketed funnel containing boiling water. Should the filtered fat, in a fused state, not be perfectly clear, it must be filtered a second time.
Seite 1019 - C. for one hour, filter, and wash with ammonium nitrate solution. (Test the filtrate by renewed digestion and addition of more molybdic solution.) Dissolve the precipitate on the filter with ammonia and hot water and wash into a beaker to a bulk of not more than 100 cc.
Seite 1120 - C. and its separate entry in the analysis is advisable as not infrequently affording at once to the lithologist an indication of the mineral character of one or more of the rock constituents, thus perhaps confirming the microscopical evidence or suggesting further examination in that line. An unusually high loss at 100° would be regarded as probable evidence of the presence of zeolites or other minerals carrying loosely combined water. It has been objected that the true hygroscopic moisture varies...
Seite 1111 - ... reagents, however carefully purified, still contain or extract from the vessels used traces of impurities, which are eventually weighed in part with the constituents of the rock. The dust entering an analysis from first to last is considerable, washings of precipitates may be incomplete, and if large filters are used for small precipitates the former may easily be insufficiently washed.
Seite 1023 - Next add 50 cc of the soda solution, or sufficient to make the reaction strongly alkaline, pouring it down the side of the flask so that it does not mix at once with the acid solution.
Seite 1156 - ... per cent of a rock is ordinarily of small moment compared with the ability to certify to its presence with approximate correctness. With such small amounts of barium as are usually found in rocks it is doubtful if...
Seite 1106 - ... of quantitative work, and their presence or absence noted among the results. If present in little more than traces, that knowledge alone may suffice, for it is often more important to know whether or not an element is present than to be able to say that it is there in amount of exactly 0.02 or 0.06 per cent. In the tabulation of analyses a special note should be made in case of intentional or accidental neglect to look for substances which it is known are likely to be present.
Seite 1155 - A single solution of the ignited barium sulphate in concentrated sulphuric acid and reprecipitation by water suffices to remove traces of calcium which might contaminate it if the rock was one rich in calcium, and even strontium is seldom retained by it in quantity sufficient to give concern.
Seite 1160 - TiO2 are dissolved in hot hydrochloric acid and filtered into a large platinum crucible, the filter burned and added, the solution evaporated to pastiness, a little water added to dissolve the salts, and dry sodium carbonate added in portions and stirred in thoroughly to prevent lumpiness in the fusion to follow, which is continued for half an hour. Addition of sodium nitrate is not necessary. The fused mass is boiled out with water and washed with very dilute sodium-carbonate solution. In the residue...
Seite 1179 - ... narrow limits if due care be given to the reduction of the volume of residual alcohol before filtration. The filtrate and washings are evaporated to dryness, treated with...