Spectrophotometric determination of platinum in glass after extraction with polyurethane foam

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

“…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. The reagents phenanthrenequinone monoximes 20,21 and 1-(2-pyridylazo)-2-naphthol 22 have been used for spectrophotometric determination of platinum after solid-liquid extraction.…”

“…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.…”

Selective Extraction of Calcium on Tri-n-butyl Phosphate Plasticized Selective Extraction of Calcium on Tri-n-butyl Phosphate Plasticized Polyurethane Foam for Its Spectrophotometric Determination in Glass and Ceramics

“…Braun [8][9][10][11] and Palagyi 12 published some reviews about the use of PUF in separation and preconcentration procedures applied to several systems of analytical interest. PUF can be used without pretreatment [13][14][15][16][17] and also after reagent immobilization or plasticizing. [18][19][20][21][22][23] Braun and Farag suggested the loading of PUF membranes with tri-n-butyl phosphate (TBP) and described the analytical use of TBP-foam membranes in batch and column operations.…”

A highly sensitive spectrophotometric determination of platinum(IV) using leuco xylene cyanol FF

“…Platinum vessels are often used when melting special types of glasses, which results in traces of platinum being introduced into the glass matrix and affecting the expected properties of the glass. Therefore, determination of platinum in such glasses is often necessary for evaluation and quality control [4]. Owing to its corrosion resistant nature and alloying ability, platinum and its alloys are used in dental and medicinal devices and in manufacture of jewelry [5].…”