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Ion chromatographic determination of hydrazine in excess ammonia for monitoring graphene oxide reduction reaction

journal contribution
posted on 2023-05-20, 07:19 authored by Koreshkova, AN, Vipul GuptaVipul Gupta, Peristyy, A, Nesterenko, PN, Thomas RodemannThomas Rodemann, Brett PaullBrett Paull
A new ion chromatography method has been developed to study graphene oxide (GO) reduction by monitoring hydrazine concentration in the GO suspension. The method is based on ion chromatographic separation of hydrazine (from excess ammonia) and its selective determination by electrochemical detection. The developed analytical protocol overcame the significant practical challenges of atmospheric hydrazine oxidation and minimised the matrix interference in both separation and detection which result from the excess of ammonium with respect to hydrazine (up to 5.8 × 104 times) in GO reduction experiments. Chromatographic separations were achieved using a high capacity IonPac CS16 cation-exchange column with a 30 mM methanesulfonic acid (MSA) eluent, within an analysis time of less than 20 min. Detection of hydrazine as hydrazinium ion using electrochemical detector was linear between 10 μM and 4 mM, with LOD and LOQ values of 3 μM and 10 μM, respectively. Standard additions confirmed 103 ± 0.8% recovery. The developed method was successfully used to determine the point of complete GO reduction with hydrazine. Reaction curves for GO reduction generated using the method were compared to results from Fourier-transform infrared spectroscopy and Raman spectroscopy to verify the utility of the approach.

History

Publication title

Talanta

Volume

205

Article number

120081

Number

120081

Pagination

1-7

ISSN

0039-9140

Department/School

School of Natural Sciences

Publisher

Elsevier

Place of publication

Amsterdam, Netherlands

Rights statement

Copyright 2019 Elsevier B.V.

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the chemical sciences