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Polarography is a classical voltammetric technique used to analyze electrochemical reactions. This method applies a linear potential sweep to a dropping mercury electrode (DME), and the resulting current is measured. A dropping mercury electrode is commonly used as the working electrode in polarography. It consists of a capillary tube filled with mercury, where the tiny droplet forms at the tip. This droplet continuously drops from the capillary, creating a new electrode surface for each...
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Cyclic voltammetry (CV) is an electrochemical technique used to investigate the redox properties of a chemical species. It involves measuring the current response of an electrochemical cell as a function of the applied potential. The setup for cyclic voltammetry typically consists of a working electrode, a reference electrode, and a counter electrode—all immersed in an electrolyte solution. The working electrode is where the redox reaction of interest occurs, while the reference electrode...
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The utilization of strain gauges as transducers for converting mechanical strain into electrical signals is a common practice in various engineering applications. These strain gauges are frequently integrated into Wheatstone bridge circuits to accurately measure parameters such as force or pressure. Within this context, each element within the circuit exhibits a resistance that undergoes subtle variations when subjected to mechanical strain. The primary objective is to convert minuscule...
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Voltammetry is an electroanalytical technique in which the current flowing through an electrochemical cell is measured as a function of applied potential, typically under conditions of concentration polarization. The technique provides valuable information about redox-active species, and the current response is plotted as a voltammogram.
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Anodic Stripping Voltammetry (ASV), Cathodic Stripping Voltammetry (CSV), and Adsorptive Stripping Voltammetry (AdSV) are electrochemical techniques used to determine trace amounts of analytes in solution. These methods involve applying a potential to an electrode and measuring the resulting current.
Anodic Stripping Voltammetry (ASV)
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Differential-pulse voltammetry (DPV) is a type of voltammetry that involves applying a series of voltage pulses to an electrochemical cell while measuring the resulting current. In DPV, the differential pulse or small potential pulses are superimposed on a linear potential sweep. The magnitude of these pulses is typically small, often in the millivolt range. Each voltage pulse lasts a short duration, usually in the order of a few milliseconds, and is applied at regular intervals along the...
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Related Experiment Video

Updated: May 6, 2026

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[Design and development of trace Cr(VI) sensor].

Shou-Guo Zheng1, Miao Li, Xin-Hua Zeng

  • 1Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 231500, China. zhshg1985@163.com

Guang Pu Xue Yu Guang Pu Fen Xi = Guang Pu
|October 29, 2013
PubMed
Summary

A new sensor enables rapid, on-site detection of trace hexavalent chromium in medicine capsules. This portable device offers reliable, low-cost field analysis, overcoming laboratory limitations for hexavalent chromium (Cr(VI)) monitoring.

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Area of Science:

  • Analytical Chemistry
  • Materials Science

Context:

  • Traditional laboratory analysis of hexavalent chromium in medicine capsules is time-consuming and impractical for field applications.
  • There is a need for rapid, on-site methods to detect trace amounts of hexavalent chromium.

Purpose:

  • To design and develop a portable sensor for the on-site detection of trace hexavalent chromium in medicine capsules.
  • To achieve miniaturization of testing instruments for field-deployable analysis.

Summary:

  • A novel sensor integrating chemically sensitive materials, an optical sensing module, and a signal processing module was developed for hexavalent chromium detection.
  • The sensor utilizes a photoelectric acquisition, conversion, and signal processing system for rapid analysis.
  • Experimental results demonstrate a good linear relationship (R²=0.99862) for hexavalent chromium concentrations from 10-500 µg/L, with a detection limit of 10 µg/L and a response time of approximately 90 seconds.

Impact:

  • The developed sensor achieves miniaturization, enabling rapid, low-cost, and reliable on-site detection of trace hexavalent chromium.
  • This technology addresses the limitations of laboratory-based analysis, facilitating immediate quality control and safety assessments in various settings.
  • Validated with capsule samples, the sensor's quantitative data proves reliable for field applications.