By Mazor T.
Learn in natural chemistry, extending to the practise of latest compounds, institution in their constitution and the exam of the kinetics and mechanisms of the reactions concerned, additionally calls for the equipment, yet many of the analytical paintings employs glossy instrumental ideas, comparable to mass spectrometry, high-performance liquid and gasoline chromatography, nuclear magnetic resonance spectroscopy etc. quantity XV covers one subject: natural research. the current textual content describes the topic intensive and element and covers advancements that have happened so far.
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Additional info for Methods of organic analysis
These volatile copper compounds can easily be excited and produce a characteristic green or bluish green colour at the temperature of the flame of a Bunsen burner. 1 \ig of copper or halide can be detected in this way. This very favourable reaction has been investigated by several workers, and was found to be non-selective for the three halogens, as positive tests are obtained with all compounds that produce hydrogen cyanide, hydrogen cyanate or hydrogen thiocyanate during thermal decomposition.
Detection of sulphur In certain organic compounds, sulphur can be detected without decomposition by means of simple and rapid reactions. F o r example, the reactive — S H group in thiols will react with metal ions to form very insoluble sulphides, which also yield poorly soluble metal mercaptides: R—SH + Ag = R—SAg + H + R—SH + H g 2 + = R—SHg 4 R—SH + 2 C u 2 + + + + H + = 2 CuS—R + R—S—S—R + 4 H + Solutions of thiols eliminate the colour of iodine solution: 2 R — S H + 1 = R—S—S—R + 2 I 2 +2H + Thiols are capable of forming several coloured compounds.
The sensitivity of the reaction is 3-5 ng of sulphur. 7. Detection of halogens Methods on the macro- and semimicro-scale for the detection of halogens in organochlorine, -bromine and -iodine compounds have been known for many years. Organofluorine compounds, and thus methods designed for their detection, have been developed only recently. , drinking water, are relatively old. In the last 30 years, halogen-containing organic compounds have gained widespread application in herbicides and insecticides, and therefore sensitive reactions capable of detecting very small amounts of these compounds are required for their determination in plants, fruits, water and soil.