On poisons in relation to medical jurisprudence and medicine . ense any vapors thatmay pass over. The receiver, as well as the condensing-tube, shouldbe kept cool by wetting its surface with cold water diffused on a layerof bibulous paper placed over it. A perfect condensation of the distilledliquid is insured by this arrangement. The distillation may be carriedto dryness, or nearly so, on a sand-bath; and it may be sometimes ad-visable, in order to insure the separation of the whole of the arsenic aschloride, to add to the residue in the retort another portion of pure and 320 ARSENIC DISTILLA
On poisons in relation to medical jurisprudence and medicine . ense any vapors thatmay pass over. The receiver, as well as the condensing-tube, shouldbe kept cool by wetting its surface with cold water diffused on a layerof bibulous paper placed over it. A perfect condensation of the distilledliquid is insured by this arrangement. The distillation may be carriedto dryness, or nearly so, on a sand-bath; and it may be sometimes ad-visable, in order to insure the separation of the whole of the arsenic aschloride, to add to the residue in the retort another portion of pure and 320 ARSENIC DISTILLATION PROCESS. concentrated hydrochloric acid, and again distil to dryness. I have,however, found that portions of dried liver and stomach gave up everytrace of arsenic by one distillation, when a sufficient quantity of stronghydrochloric acid had been used, and the process slowly conducted bya regulated sand-bath heat. The liquid product may be colored, turbid, and highly offensive ifdistilled from decomposed animal matter. Exposure to the air for a Fig. Apparatus for distilling organic and mineral substances containing arsenic. few hours sometimes removes the offensiveness, and there is a precipita-tion of sulphur, or of some sulphide, without any absolute loss of distillate may be separated from any deposit by filtration, and, ifstill turbid, it may be again distilled at a lower heat to separate it fromany organic matter that may have come over. The first stage of theprocess therefore converts the arsenic into chloride. If arsenic was present in the solid, the distillate will contain chlorideof arsenic, which, although volatile at 270°, does not escape from adiluted solution at common temperatures. The quantity of dry organicsubstance used in the experiment must depend on the quantity of arse-nic present, as revealed by a preliminary trial with Reinschs large, two or three drachms of the dried substance, or even less,will yield sufficient chloride
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectpoisons, bookyear1875
