A combined micro‐gravimetric and titrimetric micro‐determination of thallium in toxicological material

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Abstract
A method is described for the specific determination of from 0.01 to 5 mg of thallium in excreta and organs. It is based upon the partial destructive oxidation with potassium chlorate and hydrochloric acid, extraction with ether as TlCl3, removal from the ether layer as TlCl with water containing SO2 and destruction of minute quantities of accompanying organic substances. The thallium is precipitated as TlI and isolated by centrifuging. The precipitate can be determined micro‐gravimetrically, however, with < 0.1 mg of thallium the error in weighing is relatively large.The iodometric titration of the TlI here first described is always more accurate. The principles of sources of error of the operations are discussed. The ions Pb, Hg, Cu, As, Sb, Bi and Fe do not interfere.

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