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Books Bücher 1 - 9 von 9 in ... absence of iron. Should there be fear of a trace of silica being present, it...
" ... absence of iron. Should there be fear of a trace of silica being present, it can be removed by a drop of hydrofluoric and sulphuric acids before weighing the barium sulphate.6 b. "
Bulletin - United States Geological Survey - Seite 198
von Geological Survey (U.S.) - 1910
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The Chemical News and Journal of Industrial Science; with which is ..., Band 78

1898
...sulphate obtained is hardly ever needful, especially as it has been precipitated in absence oi iron. Should there be fear of a trace of silica being present,...sulphuric acids before weighing the barium sulphate. This, of course, gives the toial sulphur in the rock. If soluble sulphates and sulphides as well as...
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Analyses of Rocks, with a Chapter on Analytical Methods ..., Band 8,Ausgabe 148

Frank Wigglesworth Clarke, William Francis Hillebrand - 1897 - 306 Seiten
...sulphate obtained is hardly ever needful, especially as it has been precipitated in absence of iron. Should there be fear of a trace of silica being present,...sulphuric acids before weighing the barium sulphate. This, of course, gives the total sulphur in the rock. If soluble sulphates and sulphides as well as...
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Survey of the Northwestern Boundary of the United States ..., Band 8,Ausgabe 174

Marcus Baker - 1900 - 78 Seiten
...sulphate obtained is hardly ever needful, especially as it has been precipitated in absence of iron. Should there be fear of a trace of silica being present,...sulphuric acids before weighing the barium sulphate. This, of course, gives the total sulphur in the rock. If soluble sulphates and sulphides as well as...
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Bulletin, Ausgaben 303-308

1907
...sulphate obtained is hardly ever needful, especially as it has been precipitated in the absence of iron. Should there be fear of a trace of silica being present,...hydrofluoric and sulphuric acids before weighing the barium sulphate.6 b. FRACTIONAL DETERMINATIONS. If traces of water-soluble sulphates are present, they can...
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The Areas of the United States, the States, and the Territories

Henry Gannett - 1906 - 9 Seiten
...sulphate obtained is hardly ever needful, especially as it has been precipitated in the absence of iron. Should there be fear of a trace of silica being present,...hydrofluoric and sulphuric acids before weighing the barium sulphate.6 b. FRACTIONAL DETERMINATIONS. If traces of water-soluble sulphates are present, they can...
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The analysis of silicate ad carbonate rocks

William Francis Hillebrand - 1907 - 200 Seiten
...sulphate obtained is hardly ever needful, especially as it has been precipitated in the absence of iron. Should there be fear of a trace of silica being present,...hydrofluoric and sulphuric acids before weighing the barium sulphate.6 b. FRACTIONAL DETERMINATIONS. If traces of water-soluble sulphates are present, they can...
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Results of Spirit Leveling in Illinois, 1896-1908, Inclusive

1910 - 74 Seiten
...silica with the barium sulphate.0 It is well that this is so, for evaporation on a bath heated b}r gas to remove silica would in many cases involve an...traces of water-soluble sulphates are present , they ran he removed when desired by boiling water. o The results of CW Stoddart (Jour. Am. Chem. Soc., vol....
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Bibliography of North American Geology for 1918 with Subject Index

John Milton Nickles - 1919 - 148 Seiten
...present, by contamination from I he sulphur of the gas burned. With a steam bath this difficulty does mil present itself. Should there be fear of a trace of...sulphuric acids before weighing the barium sulphate. In order to reduce greatly the error caused by the presence of sodium chloride resulting from the sodium...
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Bulletin, Ausgabe 700

1919
...so, for evaporation on a bath heated by gas, in order to remove silica, would involve in many cases an error fully equal to the sulphur present, by contamination...sulphuric acids before weighing the barium sulphate. In order to reduce greatly the error caused by the presence of sodium chloride resulting from the sodium...
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