Title: A Further Study on the Analysis of Anions (II) Inclusion of Tungstate, Vanadate and Molybdate in the System of Anion Analysis.
Abstract:A Scheme of Systematic analysis of anions proposed by one of the anthors (Tingping chao) twenty-two years ago is very Similar to those proposed by Dobbins and Ljung, Dobbins and Kapp and some others i...A Scheme of Systematic analysis of anions proposed by one of the anthors (Tingping chao) twenty-two years ago is very Similar to those proposed by Dobbins and Ljung, Dobbins and Kapp and some others in that a similar method is used in the separation of common anions into five or six groups systematically as in the separation of cations into groups. This scheme of systematic analysis of anions has been adopted as a part of qualitative analysis by some universities (as the Central University and Futan Uninersity) and verified to be adequate. But, due to the demand of raising the quality and quantity in education, it seems that these schemes still have a common defect. They deal with only the common anions and not witn those anions formed from the so-called rare elements, such as tungstate, vanadate and molybdate. Tungsten, vanadium and molybdenum not only are the most important materials in the socialist construction, but also occur abundantly in the earth's crust and are frequently present in the samples to be analyzed. The first step in the analysis of anions is usnally the preparation of the Prepared Solution, i. e., the treatment of the sample with sodium carbonate solution. After the sodium carbonate treatment, any tungsten, vanadium or molybdenum present in the sample will be wholly or partially converted into tungstate, vanadate or molybdate respectively. They enter into the Prepared Solution together with the common anions. If the possible presence of tungetate, vanadate or molybdate is not considered during the systematic analysis of anions, not only these will be neglected but also the detection of common anions will be interfered with. In attempting to remedy this defect, the present investigation was undertaken. The experiments performed in this investigation consist of two series: (Ⅰ) Preliminary experiments, and (Ⅱ) Systematic analysis including tungtate, vanadate and molybdate. The prelininary experiments are further divided into three sections: (1) To verify whether tungsten, vanadium or molybdenum, when present in the sample, is actually converted into tungstate, vanadate or molybdate respectiuely and enters into the Prepared Solution during the treatment with sodium carbonate solution. (2) To test, in the course of the systematic analysis of anions, where tungstate, vanadate or molybdate is precipitated if each of them is singly analyzed. (3) To test the influences of some possibly interfering ions. The second series of experiments is consisted in the proposed procedures for the separation and identification of anions in the systematic analysis including tungstate vanadate and molybdate. Only the first four groups of anions are described, because no tungstate, vanadate or molybdate is retained in the subsequent groups. The detailed procedures are given in the following five tables.Read More
Publication Year: 1957
Publication Date: 1957-01-01
Language: en
Type: article
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