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Related Concept Videos

Voltammetry: Stripping Methods01:13

Voltammetry: Stripping Methods

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)
ASV is used to determine metals and metalloids at trace levels. It involves two steps: deposition and stripping. First, a negative potential is applied to the...
Voltammetric Techniques: Linear-Scan (E vs Time)01:12

Voltammetric Techniques: Linear-Scan (E vs Time)

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...
Electrogravimetric Analysis: Overview01:30

Electrogravimetric Analysis: Overview

Electrogravimetric analysis measures the weight of an analyte deposited electrolytically onto a suitable working electrode. This method involves applying a potential to a pre-weighed electrode submerged in a solution, which results in the desired substance being deposited through reduction at the cathode or oxidation at the anode. The electrode's weight is recorded after deposition, and the difference in weight gives the analyte's weight in the solution.
To test the completeness of the...
Electrodeposition01:08

Electrodeposition

Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
Voltammetric Techniques: Pulse Voltammetry01:17

Voltammetric Techniques: Pulse Voltammetry

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...
Voltammetric Techniques: Cyclic Voltammetry01:10

Voltammetric Techniques: Cyclic Voltammetry

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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Application of sequential injection analysis to anodic stripping voltammetry.

A Ivaska1, W W Kubiak

  • 1Laboratory of Analytical Chemistry, Abo Akademi University, FIN-20500, Turku-Abo, Finland.

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Summary

Sequential injection analysis (SIA) coupled with anodic stripping voltammetry (ASV) offers sensitive and selective copper determination. This method reduces mercury waste and enhances detection through on-line mercury film plating and repeated sample passage.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry

Background:

  • Anodic stripping voltammetry (ASV) is a sensitive electrochemical technique.
  • Mercury-based electrodes are common in ASV but pose environmental concerns.
  • Sequential injection analysis (SIA) offers precise fluid handling capabilities.

Purpose of the Study:

  • To integrate SIA with ASV for improved analytical performance.
  • To reduce mercury waste generation during ASV analysis.
  • To enhance sensitivity and selectivity in electrochemical measurements.

Main Methods:

  • On-line mercury film plating within the SIA system.
  • Repeated sample passage through the detector during deposition.
  • Medium exchange procedures using SIA for enhanced selectivity.
  • Determination of copper in tap water using calibration and standard addition methods.

Main Results:

  • SIA effectively controlled sample and reagent volumes.
  • On-line plating significantly reduced mercury-containing waste.
  • Repeated sample passage enhanced analytical sensitivity.
  • Medium exchange improved method selectivity, demonstrated by potential shifts.

Conclusions:

  • SIA-ASV is a viable technique for sensitive and selective metal ion determination.
  • The method offers an environmentally friendlier alternative to traditional ASV.
  • The SIA system allows for robust control over analytical parameters, leading to improved results.