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Titrimetric Methods: Types and Commonly Used Strategies

Titrimetric Methods: Types and Commonly Used Strategies

In chemistry, titrimetric methods are broadly classified into three types: volumetric, gravimetric, and coulometric. Volumetric titrations involve measuring the volume of a titrant of known concentration that is required to react completely with an analyte. In gravimetric titrations, the standard solution reacts with the analyte to form an insoluble precipitate, which is filtered, dried, and weighed. In coulometric titrations, current is applied to an electrochemical reaction until the reaction...

Controlled-Current Coulometry: Coulometric Titration

Controlled-Current Coulometry: Coulometric Titration

Coulometric titrations are a form of titrimetric analysis where the reagent is generated electrically, and its amount is evaluated based on current and generating time. The electron serves as the standard reagent. The procedure is similar to conventional titrations, such as endpoint detection.
The fundamental requirements for coulometric titrations are (1) 100% efficiency in the reagent-generating electrode reaction and (2) a stoichiometric and preferably rapid reaction between the generated...

Precipitation Titration: Endpoint Detection Methods

Precipitation Titration: Endpoint Detection Methods

In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...

Precipitation Gravimetry

Precipitation Gravimetry

Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...

End Point Prediction: Gran Plot

End Point Prediction: Gran Plot

A Gran plot is used to predict the equivalence volume or endpoint of a potentiometric or acid-base titration without reaching the endpoint. Typically, titration data is collected as a function of the titrant's volume up to a point less than the equivalence volume and then transformed into a linear format. The straight line is extended to the x-axis, indicating the necessary titrant volume to achieve the equivalence point.
For potentiometric titration, the Gran plot is created by plotting the...

Precipitation Titration: Overview

Precipitation Titration: Overview

Precipitation titration involves the reaction of a titrant and an analyte to generate an insoluble precipitate. While precipitation titration uses various precipitating agents, silver nitrate is the most common precipitating reagent; titrations involving Ag+ are called argentometric titrations. Usually, the endpoint in a precipitation titration can be detected by visual indicators.
A precipitation titration curve demonstrates the change in concentration of the titrant or analyte upon adding the...

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Related Experiment Video

Updated: Jun 28, 2026

Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil

Two-Dimensional Visualization and Quantification of Labile, Inorganic Plant Nutrients and Contaminants in Soil

Published on: September 1, 2020

High accuracy pre-formed gradient discontinuous flow titrimetry.

J D Petty¹, D A Petty, R M Peachey

¹Ionode Pty. Ltd., PO Box 52, Holland Park, Queensland 4121, Australia.

|March 1, 1994

Summary

This study introduces a novel Discontinuous Flow Analysis (DFA) titrimetry method using pre-formed gradients for enhanced precision. The automated technique achieves high accuracy and linearity, comparable to traditional batch titrations.

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Area of Science:

Analytical Chemistry
Chemical Analysis Techniques

Background:

Conventional titrimetry methods can be time-consuming and may lack precision.
Discontinuous Flow Analysis (DFA) offers potential for automation and improved analytical efficiency.

Purpose of the Study:

To develop and evaluate a variant of Discontinuous Flow Analysis (DFA) titrimetry using pre-formed gradients.
To assess the accuracy, linearity, and efficiency of this novel titrimetric approach.

Main Methods:

A pre-formed gradient between two titrant concentrations was established.
Analyte was aspirated into the gradient at a constant rate.
Photometric endpoint detection was employed for a simple acid-base titration model.

Main Results:

The method achieved accuracy comparable to conventional batch titrimetry (approx. 0.1% relative error).
Excellent calibration linearity was observed (r(2) = 0.9997, SE approx. 0.05% relative).
Titrations were rapid (1 per 25 sec) with minimal reagent consumption (0.8 mL analyte, 0.85 mL titrants).

Conclusions:

The developed DFA titrimetry variant offers a highly accurate and efficient automated analytical method.
The use of pre-formed gradients in DFA enhances encoder pulse resolution and analytical performance.
This method presents a viable alternative to conventional titrimetry for routine analysis.