, by employing a more electro-positive
metal to precipitate a less electro-positive one from its solution.
The quantitative electrolytic methods of analysis, some of which I had
the honor of bringing before the notice of the Society some time back
(this Journal, 1889, 256), have placed a number of methods of
determination and separation of metals in the hands of chemists, which
can be employed with advantage in qualitative analysis, especially in
case of medical and medico-legal inquiry. These methods are not
supposed to supersede in any way the ordinary methods of qualitative
analysis, but to serve as a final and crucial means of identification,
and thus to render it possible to detect very small quantities of the
substances in question with very great certainty. As such they fulfill
the required conditions admirably, being readily carried out,
comparatively free from contamination with impure reagents, and
capable of being rendered quantitative whenever desired.
In conjunction with Mr. E.V. Ellis, B.Sc., I have examined the
applicability of the electrolytic methods for the detection of the
chief mineral poisons (with the exception of arsenic, an electrolytic
process for the detection of which has already been devised, as
described), viz.
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