 | 1898 - 356 Seiten
...introduce further uncertainty. In general, it would be safe enough to assume the composition Fe7Ss for pyrrhotite. However carefully all these separate...than approximations when much sulphide is present. Boron. To the best of the writer's belief it has never been necessary in this laboratory to estimate... | |
 | 1901 - 392 Seiten
...aft ion could take place, and probably before the ferric salts were largely attacked, but of couise the small proportion of sulphur set free as such from...it would be safe enough to assume the composition Fc7Ss for pyrrhotite. However carefully all these separate determinations may be carried out, the final... | |
 | 1896 - 1020 Seiten
...introduce further uncertainty. In general, it would be safe enough to assume the composition Fe7S8for pyrrhotite. However carefully all these separate determinations...than approximations when much sulphide is present. BOBON. •* To the best of the writer's belief it has never been necessary in this laboratory to estimate... | |
 | Geological Survey (U.S.) - 1896 - 1090 Seiten
...hydrogen sulphide would be expelled before any such action could take place and probably before the ierric salts were largely attacked, but of course the small...it would be safe enough to assume the composition Fe, S8 for pyrrhotite. However carefully all these separate determinations may be carried out, the... | |
 | Frank Wigglesworth Clarke, William Francis Hillebrand - 1897 - 342 Seiten
...introduce further uncertainty. In general, it would be safe enough to assume the composition Fe7 S8 for pyrrhotite.. However carefully all these separate...than approximations when much sulphide is present. BORON. To the best of the writer's belief it has never been necessary in this laboratory to estimate... | |
 | 1907 - 874 Seiten
...introduce further uncertainty. In general, it would be safe enough to assume the composition FejS8 for pyrrhotite. However carefully all these separate...approximations when much sulphide is present (see p. 138, c. «). 25 BORON. To the best of my belief it has never been found necessary in this laboratory... | |
 | Henry Gannett - 1906 - 644 Seiten
...introduce further uncertainty. In general, it would be safe enough to assume the composition FejSg for pyrrhotite. However carefully all these separate...approximations when much sulphide is present (see p. 138, c. a). 25. BORON. To the best of my belief it has never been found necessary in this laboratory... | |
 | William Francis Hillebrand - 1907 - 212 Seiten
...carbon-dioxide atmosphere, and that of the decomposable sulphides by collecting the hydrogen sulphide evolved.0 In the residue the sulphur of the insoluble sulphides...approximations when much sulphide is present (see p. 138, c. <*). 25. BORON. To the best of my belief it has never been found necessary in this laboratory... | |
 | Geological Survey (U.S.) - 1907 - 220 Seiten
...carbon-dioxide atmosphere, and that of the decomposable sulphides by collecting the hydrogen sulphide evolved.0 In the residue the sulphur of the insoluble sulphides...approximations when much sulphide is present (see p. 138, c. «). 25. BORON. To the best of my belief it has never been found necessary in this laboratory... | |
 | William Francis Hillebrand - 1910 - 252 Seiten
...carbon-dioxide atmosphere, and that of the decomposable sulphides by collecting the hydrogen sulphide evolved.0 In the residue the sulphur of the insoluble sulphides...approximations when much sulphide is present (see c. a, p. 165). 25. BORON. No doubt boron occurs occasionally in rocks in amounts superior to those... | |
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The error involved in the above estimation of the sulphur of soluble sulphides, due to the possible reducing effect of hydrogen sulphide on ferric salts, is probably negligible. Most of the hydrogen sulphide would be expelled before any such action could... 
