Ultraviolet spectrophotometric determination of cyanide ion

Abstract

Elimination of D20 from deuterated 4 affords the abundant ion at m\e 270. As expected only one molecule of D20 is lost since the second hydroxyl group is attached to the aromatic ring. In contrast, the cardenolide, digitoxigenin (5), affords a CI(D20) spectrum containing peaks corresponding to the successive loss of D20 and HDO from the d2-5 + D+ion.In addition to the above examples, we have also obtained Cl (D20) spectra on a number of compounds containing one or more common organic functional groups. Our findings indicate that hydrogen bonded to heteroatoms in alcohols, phenols, carboxylic acids, amines, amides, and mercaptans undergoes essentially complete exchange in the ion source when D20 is employed as the reagent gas at a pressure of 0.4 Torr. Small amounts of deuterium incorporation (<15%) occur in some ketones, aldehydes, and esters but, in general, this does not complicate the analyses. At the usual sample pressures (<10"e Torr) unsaturated compounds such as benzene, stilbene, and 3,3-dimethyl-l-butene fail to undergo exchange in the ion source.In summary, the above results indicate that CIMS using D20 as the reagent gas provides a convenient method for determining the active hydrogen content of organic molecules.Abundant ions in the molecular weight region are usually observed in CI(D20) spectra and the method of exchange minimizes isotope and sample losses.

Magnetite Synthesis in the Presence of Cyanide or Thiocyanate under Prebiotic Chemistry Conditions

“…Determination of cyanide was performed through modification of the methodology described by Scoggins, which uses the formation of nickel complex with a cyanide binder. Nickel reactive solution was prepared using a concentration of nickel chloride 1.0 10 −3 mol L −1 and ammonium hydroxide 0.5 mol L −1 [36,37]. Standard cyanide solutions were prepared using potassium cyanide in concentrations from 0.25 to 600 mg L −1 .…”

Headspace single-drop microextraction with in-drop derivatization and capillary electrophoretic determination for free cyanide analysis

“…Cyanide reacts rapidly with Ni 21 in ammoniacal solutions and forms relatively stable Ni(CN) 4 22 complex which has an absorption maximum at 267 nm and a molar absorptivity of 11 300 [35]. Even limited amounts of cyanide ions cause a complete formation of Ni(CN) 4 22 anion and this reaction is widely used for the derivatization of free cyanide prior spectrophotometric [35], polarographic [36] or capillary electrophoretic [37,38] determinations.…”

“…Even limited amounts of cyanide ions cause a complete formation of Ni(CN) 4 22 anion and this reaction is widely used for the derivatization of free cyanide prior spectrophotometric [35], polarographic [36] or capillary electrophoretic [37,38] determinations. In the present work, a detection wavelength of 254 nm was chosen, as the CE instrument was equipped with a fixedwavelength detector.…”

Simultaneous derivatization and extraction of free cyanide in biological samples with home-made hollow fiber-protected headspace liquid-phase microextraction followed by capillary electrophoresis with UV detection

“…Cyanide reacts rapidly with Ni 2+ in ammoniacal solutions and forms relatively stable Ni(CN) 4 2− complex which has an absorption maximum at 267 nm and a molar absorptivity of 11,300 [27]. This reaction is widely used for the derivatization of free cyanide prior spectrophotometric [27], polarographic [28] or CE [29,30] determinations.…”

“…This reaction is widely used for the derivatization of free cyanide prior spectrophotometric [27], polarographic [28] or CE [29,30] determinations. In this work, a detection wavelength of 254 nm was chosen, as the CE instrument was equipped with a fixed wavelength detector.…”