Spectrophotometric determination of ruthenium, rhenium, osmium and platinum with organic thiohydrazides

Sequential Separation and Spectrophotometric Determination of Osmium and Platinum with 5-Chloro-2-hydroxythiobenzhydrazide

“…20 formation. Pyrogallol red suffers from interference by many Various reagents, such as thiobenzhydrazides, [21][22][23] metal ions; osmium requires prior separation by extraction into phenanthrenequinone monosemicarbazone, 24 8-hydroxy-isobutyl methyl ketone and back-extraction into sodium hydroxide quinoline, 25 perpheneazine dihydrochloride, 26 4(5)-d-arabino-solution, which increases the time of determination. The tetrahydroxybutylimidazoline-2-thione, 27 ethylisobutrazine reagents used for the liquid-liquid extraction and hydrochloride, 28,29 allyl thiourea, 30 thiobarbituric acid, 31 4-(2-spectrophotometric determination of osmium require multiple pyridylazo)resorcinol, 32 pyrogallol red, 33 rhodamine B, 34 extractions for a quantitative recovery of the metal.…”

“…Such alloys are found in ball-point pen tips, fountain-pen many metal ions interfere in the determination of the osmium. tips, record-player needles, electrical contacts, hard coatings of 2-Furanthiocarboxhydrazide 23 complex with osmium being cutting tools and abrasives, [1][2][3] hydrogenation catalysts, 4 extracted into benzene, which is a hazardous chemical. electrochemical reactor devices, 5 pacemakers and heart valves, 6 Thiobenzhydrazide solutions in ethanol are unstable at room as well as heavy-fermion superconductor 7 and biocompatible temperature, and are affected by sunlight, and therefore must be substrates.…”

Spectrophotometric Determination of Traces of Platinum with 5-Chloro-2-hydroxythiobenzhydrazide after Extraction into Molten Naphthalene

“…These methods suffer from some drawbacks, such as a longer waiting period for color development, 7,9 a need for multiple extractions for quantitative recovery of the metal, 8 presence of stannous chloride, 12,14 narrow pH range, 10,13,19 high molarity of aqueous phase, 14,16 low absorptivity, 15 low sensitivity 13,20 and low stability of the reagents, [7][8][9] as shown in Table 1. None of these methods allow the separation and separate determination of platinum and rhenium.…”

“…Annually, over 5 million pounds of spent Reformer Catalysts are treated for the recovery of contained platinum and rhenium. 6 The use of thiohydrazides such as o-hydroxythiobenzhydrazide, 7 thiobenzhydrazide, 8 α-naphthalenethiocarboxhydrazide, 2-pyrrolthiocarboxhydrazide, furanthiocarboxhydrazide, thiophenethiocarboxhydrazide, 9 dibenzylidenethiocarbohydrazide, 10 and 2-furancarbothioic acid hydrazide 11 in the spectrophotometric determination of rhenium and platinum group metals has been described in a number of papers. Other reagents such as dithizone, 12 anisaldehyde-4-phenyl-3-thiosemicarbazone, 13 dithizone-polyurathane, 14 4-phenylthiosemicarbazide, 15 3-(2′-thiazolylazo)-2,6-diaminopyridine, 16 N-(m-methylphenyl)-N′-(sodium p-aminobenzenesulfonate)-thiourea, 17 piperonal thiosemicarbazone, 18 and leuco xylene cyanol FF, 19 have been reported for spectrophotometric determination of platinum after liquid-liquid extraction.…”