Arabian Journal for Science and Engineering

, Volume 44, Issue 1, pp 179–187 | Cite as

Voltammetric Detection of Hg(II) in Real Wastewater Using Red Alga Modified Carbon Paste Electrode: Mechanism Insight

  • Maria ZaibEmail author
  • Muhammad Makshoof Athar
Research Article - Chemistry


Mercury is one of the persistent environmental pollutants, and its detection has gained massive attention these days. The study exploited the ability of unicellular red alga Porphyridium cruentum-based carbon paste electrode to detect Hg(II) in wastewater. Hg(II) is initially deposited as Hg\(^{0}\) on the surface of electrode by applying deposition potential of − 0.5 V, which afterward stripped off using anodic scan between − 0.5 and \(+\) 0.5 V. Experimental parameters like biomass-to-carbon ratio, deposition potential, accumulation time, pH of accumulating medium were optimized. Best response of P. cruentum-based electrode for Hg(II) was obtained using 10% biomass at pH 7. Carboxylate and phosphate functional moieties on the surface of modified electrode are mainly involved in accumulation and stripping procedure of Hg(II). The limit of detection for Hg(II) by the proposed electrochemical sensor was found to be 0.95 \(\upmu \)\(\hbox {L}^{-1}\). The efficiency of modified electrode was studied in the presence of several interfering ions. In the end, intraday and interday precision studies were carried out for real wastewater samples, and further, these results were compared to a standard analytical method for evaluating efficacious working of modified electrode.


Carbon paste electrode Voltammetry Chloralkali industry Red alga 


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Copyright information

© King Fahd University of Petroleum & Minerals 2018

Authors and Affiliations

  1. 1.Department of ChemistryGovernment College Women UniversitySialkotPakistan
  2. 2.Institute of ChemistryUniversity of the PunjabLahorePakistan

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