Abstract
A new and validated method was described for the resolution of a ternary mixture of copper β‑resorcylate (CuR2), lead β-resorcylate (PbR2), and lead oxide in double base (DB) solid propellants without prior separation steps in accordance with military guidelines. Two sets of reaction and determination conditions were developed. The first set was based on reaction of Cu(II) and Pb(II) with 4-(2-pyridylazo)resorcinol reagent in alkaline media and using derivative ratio spectrophotometry for the simultaneous determination of Cu(II) and Pb(II) by measuring the peak intensities at 539 and 543 nm, respectively. In the second set, with hydrolysis of CuR2 and PbR2 in acetic acid medium, the released resorcylic acid was determined via complex formation of resorcylic acid with Fe(III) and absorbance measurement at 526 nm. The amounts of CuR2 and total lead can be determined by derivative ratio spectrophotometry. So, according to the obtained data for resorcylic acid, CuR2, and total lead by derivative ratio spectrophotometry, the amounts of PbR2 and PbO were determined by applying stoichiometric equations. The proposed method was successfully applied for the determination of CuR2, PbR2, and PbO in DB propellants. The results of the method were statistically compared based on t- and F-tests with those obtained by inductively coupled plasma atomic emission spectrometry. The results showed that the proposed method offers an accurate and reliable approach for the determination of these compounds in DB propellants and can be suggested as a routine method in military quality control laboratories.
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Zarei, A., Mardi, K. Development of Derivative Ratio Spectrophotometric Method for Simultaneous Determination of Copper β-resorcylate, Lead β-resorcylate, and Lead Oxide in Double base Propellants. J Anal Chem 77, 1247–1255 (2022). https://doi.org/10.1134/S1061934822100161
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DOI: https://doi.org/10.1134/S1061934822100161