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Research articles

ScienceAsia 48 (2022):ID 434-442 |doi: 10.2306/scienceasia1513-1874.2022.068

Potentiometric sensor for chromium(VI) using a composite of diphenylcarbazide-natural zeolite-modified membrane electrodes

Rudi Heryantoa,b,*, Eti Rohaetia, Laela Wulansarib, Zulhan Arifa, Wulan Tri Wahyunia,b, Budi Riza Putrac

ABSTRACT:     The construction and performance of ion selective electrodes (ISEs) for the determination of chromium(VI) based on PVC membranes modified with 1,5-diphenylcarbazide (DPC) and natural zeolite as ionophores are reported in this study. ISE was fabricated in an optimum composition of chromium(VI)-selective membrane consisting of 29 mol% DPC, 43.6 mol% natural zeolite, 25 mol% plasticizer, and 2.2 mol% PVC. The investigation of the performance of the proposed ISE was evaluated in terms of the Nernstian response, range of concentration, limit of detection, response time, and selectivity coefficient. The proposed ISE displayed a linear potential response over a concentration range of 10?1 ?10?6 M K2 Cr2O7 with a Nernstian response of ?28.8 mV/decade. Adequate sensitivity for chromium(VI) was offered by the proposed ISE with a limit of detection of 2.14?10?6 M and a response time of ?250 s. The fabricated ISE has also been investigated in selectivity studies in the presence of Cu2+ and Fe3+ and was found to be more selective in the concentration range of 10?1 ?10?6 M. Therefore, a novel membrane electrode using a composite of DPC and natural zeolite as an ionophore has shown a satisfactory result for the direct potentiometric measurement of chromium(VI) in the presence of Cu2+ and Fe3+ , which may have the potential to be used in real sample analysis.

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a Analytical Chemistry Division, Department of Chemistry, Faculty of Mathematics and Natural Sciences, IPB University, Bogor 16680 Indonesia
b Tropical Biopharmaca Research Center, Institute of Research and Community Empowerment, IPB University, Bogor 16680 Indonesia
c National Research and Innovation Agency (BRIN) Republic of Indonesia, Jakarta 10340 Indonesia

* Corresponding author, E-mail: kemometrik@gmail.com

Received 22 Oct 2021, Accepted 9 Feb 2022