Rapid and green detection of manganese in electrolytes by ultraviolet-visible spectrometry to control pollutant discharge

Zhehua Xue; Lei Li

doi:10.1371/journal.pone.0264532

Rapid and green detection of manganese in electrolytes by ultraviolet-visible spectrometry to control pollutant discharge

PLoS One. 2022 Feb 25;17(2):e0264532. doi: 10.1371/journal.pone.0264532. eCollection 2022.

Authors

Zhehua Xue^{1

2}, Lei Li^{1

2}

Affiliations

¹ State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai, China.
² Shanghai Institute of Pollution Control and Ecological Security, Shanghai, China.

Abstract

Controlling the manganese (Mn2+) concentration is important to product quality in the electrolytic manganese industry. Conventional methods for detecting Mn2+ are complex and reagent-consuming, which makes them slow and polluting. It is of great significance to develop a new fast and environmentally friendly method to quantify Mn2+ in electrolyte. The characteristic ultraviolet-visible (UV-vis) absorbance at 401 nm of Mn2+ will vary linearly with the Mn2+ concentration after data correction. Adjusting the pH, calibrating the spectral bandwidth (SBW) and optical path length (OPL), and subtracting the interference from coexisting substances by linear interpolation improve the measuring accuracy. Mn2+ concentration can be determined by direct fast UV-vis absorbance measurement at characteristic peaks without using harmful reagents which facilitates such measurement to be applicated as on-line detection method for electrolytic manganese industry. The method developed in this study will help achieve the goal of improving the detection speed while cutting back on pollutant discharge from concentration analysis process in electrolytic manganese industry.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Calibration
Electrolytes / chemistry*
Environmental Pollutants / analysis
Hydrogen-Ion Concentration
Limit of Detection
Manganese / analysis*
Manganese / standards
Spectrophotometry, Ultraviolet* / standards

Substances

Electrolytes
Environmental Pollutants
Manganese

Grants and funding

This work was supported by the Fundamental Research Funds for the Central Universities (No grant number, received by Lei Li, URL: www.moe.gov.cn). The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.