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《Acta Chimica Sinica》 1957-04
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STUDIES ON THE APPLICATIONS OF ORGANIC CATIONS AS ANALYTICAL REAGENTS I.N, N-DIMETHYLPIPERIDINIUM IODIDE AS A REAGENT FOR PALLADOUS IONS

YUNG CH'ING-HSIN and WANG K'UEI (Department of Chemistry, Peking Medical College)  
1. N, N-Dimethylpiperidinium iodide is recommended as a reagent for palladous ions. In neutral or acidic solution, it forms a black or brown precipitate with palladous ions depending on the amount of the latter present. The sensitivity is 0.2 γ (1:200,000) on the spot plate and 0.006 γ(1:200,000) on the filter paper. 2. Pt(IV) gives a brown precipitate with the reagent similar to that of Pd(II), but by the addition of a large amount of phosphate, 2 γ of Pd(II) can be detected in the presence of Pt(IV) on the spot plate, the proportion limit being Pd: Pt=1:20.Bi(III) and Hg(II) ions are also found to interfere with the reaction, giving a red or yellow precipitate, but they are soluble in concentrated hydrochloric acid. Thus by using concentrated hydrochloric acid to dissolve the precipitates formed, 16 γ of Pd(II) in the presence of ten times of its quantity of Bi(III) ions, and 0.4 γ of Pd(II) in the presence of twenty five times of its quantity of mercuric ions can be detected on the spot plate.3. The proportion limit of silver, lead, cupric, ferric, thallous and antimonous ions with palladous ions are studied, and the identification limits for Pd(II) in each case are given.4. Using spot test on filter paper, it is possible to detect 0.006 γ of Pd(II) in the presence of twenty four cations, including Bi(III), Hg(II) and Pt(IV), the proportion limits being 1:50,
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