Author
Fritz Feigl
Bio: Fritz Feigl is an academic researcher from Ministry of Agriculture. The author has contributed to research in topics: Spot analysis & Cyanide. The author has an hindex of 11, co-authored 89 publications receiving 704 citations.
Topics: Spot analysis, Cyanide, Reagent, Nitrous acid, Acetic acid
Papers published on a yearly basis
Papers
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TL;DR: In this paper, the Abspaltung von Schwefeldioxyd bei der Einwirkung von Quecksilber(II)-chlorid sowie die Umsetzung mit o-Dinitrobenzol, wobei salpetrige Saure gebildet wird.
Abstract: Zum selektiven Nachweis von Arylsulfinsauren eignet sich die Abspaltung von Schwefeldioxyd bei der Einwirkung von Quecksilber(II)-chlorid sowie die Umsetzung mit o-Dinitrobenzol, wobei salpetrige Saure gebildet wird. Beide Reaktionsprodukte sind mit Hilfe von Tupfelreaktionen feststellbar. Es werden mikroanalytische Erfassungsgrenzen erreicht.
2 citations
TL;DR: In this paper, azo dyes containing a p-phenylenediamine or p-nitroaniline structure are fused with a dry mixture of sodium formate and sodium hydroxide at 210-230°C.
Abstract: When Bandrowski's base and azo dyes containing a p-phenylenediamine or a p-nitroaniline structure are fused with a dry mixture of sodium formate and sodium hydroxide at 210–230°C. p-phenylenediamine is formed by reductive cleavage. Under these conditions the diamine sublimes and the vapour reacts with an acetic-acid solution of aniline and alkali-metal persulphate to yield the indamine dye Phenylene Blue. This procedure may be conducted by the technique of spot test analysis and serves to detect such dyes. The detection limits are in the range 5–10 μg., as has been verified by testing thirteen pertinent compounds.
2 citations
TL;DR: In this article, a new and sensitive test for free sulfur in mixtures with organic or inorganic substances is proposed, which is done in a test-tube, whose mouth carries lead acetate paper.
Abstract: Hydrogen sulfide is formed when free sulfur is heated with fused benzoin. This is the basis of a new and sensitive test for free sulfur in mixtures with organic or inorganic substances. The heating is done in a test-tube, whose mouth carries lead acetate paper. The limit of identification is 0.5µ. Selenium does not interfere. Tests of a wide variety of commercial products gave satisfactory results.
1 citations
TL;DR: In der Tupfelanalyse zur Unterscheidung von Naphthol-and Naphthylaminsulfonsauren anwendbar; es werden Erfassungsgrenzen von 0,1 bis 3μg Naphthsulfonauren erhalten as discussed by the authors.
Abstract: Eine Uberprufung des Verhaltens von 12 Naphthol- und Naphthylaminsulfonsauren gegenuber einer Mischung von Hexamethylentetramin und konz. Schwefelsaure zeigte, das mit einer Ausnahme lediglich Naphtholsulfonsauren charakteristische Farbungen liefern. Bei gewissen Naphtholmonosulfonsauren fluoreszieren die Produkte der Farbreaktionen im UV-Licht. Der Chemismus der Farbreaktionen wird diskutiert. Die Farbreaktionen sind in der Tupfelanalyse zur Unterscheidung von Naphthol- und Naphthylaminsulfonsauren anwendbar; es werden Erfassungsgrenzen von 0,1 bis 3μg Naphtholsulfonsauren erhalten.
1 citations
TL;DR: In this paper, the authors described a test for bivalent sulphur in organic compounds based on the finding that hydrogen cyanide can be detected in the gas phase if the sample is heated with mercuric cyanide to 180°.
1 citations
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270 citations
TL;DR: Colloidal silver nanoparticles synthesized by reacting aqueous AgNO(3) with Medicago sativa seed exudates under non-photomediated conditions were effective anti-bacterial agents and nanoplates are notably smaller and better faceted compared with those synthesizing by vascular plant extracts previously reported.
258 citations