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Article – Journal of Nanoscience and Technology

Journal of Nanoscience and Technology, Volume 5,Issue 1,2019 Pages 637-639


Detection of Nitrates in Water Sample by Voltammetric Analysis on Modified Carbon Nanotube Electrode
J. Rathidevi, H. Mary Helen*

https://doi.org/10.30799/jnst.214.19050115

This work is licensed under a Creative Commons Attribution 4.0 International License

The present study was carried out to determine the physico-chemical characteristics of water from selected tourist spots of Kanyakumari district during the period of twelve months from June 2016 to May 2017. Five sampling stations were selected and water samples were collected for the study. Surface water temperature varies from 24.2 to 31.5 °C and pH is ranged as 6.23 to 8.12. Variation of dissolved oxygen content was 4.2 to 6.7 mg/L. The ranges of chloride from 10 to 21100 mg/L. TDS value ranges from 30 to 41234 mg/L. Total hardness ranges from 12 to 17300 mg/L. Nitrite monitoring is particularly important in drinking water and food because of its increased relative toxicity to humans. High nitrite concentrations in humans have been linked to methemoglobinemia and stomach cancer. Nanoparticle-based materials have played an important role in the development of new electrochemical sensors and have recently gained enormous attention for the detection of hazardous ions such as nitrate compounds. The modified carbon nanotube were made by a simple citrate technique and then prepared with black carbon powder on a glassy carbon electrode for the measurement of nitrate ions in water using cyclic voltammetry and differential pulse voltammetry. CNTs electrocatalytic reduction of NO3 in acid solution was used to calculate the concentration of NO3− in water samples by measuring the reduction current on the working electrode during the NO3 reduction reaction on the surface of carbon nanotube. The ranges of nitrate, nitrite and phosphate were found to be 0.5 to 4 mg/L, 0.03 to 0.43 mg/L and 0.1 to 1.05 mg/L respectively. Electrical conductivity ranges from 45 to 62114 μs/cm.

Keywords: Physico-Chemical; Nitrates; Voltammetry; MWCNT;

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