The heterometric microdetermination of mercury with mercaptobenzthiazole in the presence of an excess of foreign metals

1. A general method is presented for the determination of 1–2 mg mercuric mercury, in the absence of complexing agents, in 20 ml solution, with an error of 0–3 %. The solution may contain: Ca, Ba, Mg, Zn, Mn, Ni, Co or Cd as nitrate of sulphate in a concentration of 0.2M. The concentration of Pb should be <0.1M and that of Al, Cr or Fe ?0.05M. 2. A special method is presented for the determination of mercury (1–2 mg Hg in 20 ml) in the presence of large excesses of bismuth (?98%) by using ethylendiammetetraacetate. Error 0–3 %. 3. A method is presented for the determination of mercury in excesses of copper in an acetic acid solution which contains ethylendiaminetetraacetate. 4. A special method is presented which permits the determination of 1–2 mg mercury in 30 ml solution which contains large excesses of copper (up to 98% or more). The titration is carried out in an alkaline solution of trisodiumcitrate. The titration proceeds rapidly. Error 0–2%.