G. Svehla's Organic Spot Test Analysis The History of Analytical PDF

By G. Svehla

Spot assessments are outlined as an analytical approach which allows the analyst to complete passable semi-micro, micro and ultra-micro checks with uncomplicated gear and minimal intake of pattern and time. those basic exams utilize the colour and scent of the natural compound within the initial degree of research and in addition the id of convinced vapors and gases developed in the course of pyrolysis. quantity X comprises chapters. the 1st, on natural spot attempt research, is complementary to P.W. West’s shorter bankruptcy on inorganic spot try out strategies, released in quantity IA greater than two decades in the past. the second one bankruptcy provides a short historical past of analytical chemistry. along with being a useful resource of references to early analytical paintings, this bankruptcy makes such a lot fun examining.

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54—60 25 in the gas phase with tetrabase copper ethylacetoacetate reagent [132]. 2 RS~ + Mg(CN) 2 -> Mg(SR) 2 + 2 CNT All sulfonic acids are pyrohydrolyzed with succinic acid at 200° C. The superheated steam liberated reacts with the solid sulfonic acid which is hydrolyzed to give sulfuric acid which is thence reduced to sulfurous acid. The latter is detected with iron(III) hexacyanoferrate(III) indicator [133] (see test procedure 20, p. 48). e. iodobismuthate solution. This reagent gives an orange to red colored precipitate with sulfoxides.

Another color reaction which permits the identification of formic References pp. 54—60 31 acid (and formates) is based on the red color obtained from citric or aconitic acid with formic acid in the presence of acetic anhydride and isopropanol [ 1 6 0 ] . (XIX) F U R F U R A L Furfural, like other aromatic aldehydes, reacts with phloroglucinol and hydrochloric acid to give an orange condensation product. However, in contrast to other aldehydes, the product obtained from furfural rapidly changes to green [ 1 6 1 ] .

4 7 ( 1 9 7 5 ) 1 4 2 4 . 5 0 A . L . L e R o s e n , R . T . K. Carlton, Anal. C h e m . , 2 4 ( 1 9 5 2 ) 51 52 53 54 55 56 57 58 1335. W. Y u r o w a n d S. S a s s , M i c r o c h e m . , 1 2 ( 1 9 6 7 ) 2 0 7 . L. L é g r â d i , M i c r o c h e m . J . , 1 6 ( 1 9 7 1 ) 4 8 3 . F . F e i g l , L. B e n - D o r a n d R. C o h e n , M i k r o c h i m . A c t a , ( 1 9 6 4 ) 1 1 8 1 . F. Feigl and V . Anger, in F . Feigl and V . Anger, S p o t Tests in Organic Analysis, Elsevier, A m s t e r d a m , 7 t h e d n .

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