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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 and Co-precipitation

Precipitation and Co-precipitation

Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...

Gravimetry: Inorganic And Organic Precipitating Agents

Gravimetry: Inorganic And Organic Precipitating Agents

In gravimetry, the precipitant is chosen carefully to obtain a pure solid that can be easily filtered. Common inorganic precipitants can be used to determine several cations and anions. In some cases, the formation of the same precipitate can be used to determine the cation and the anion. For example, the reaction of barium and chromate ions to give barium chromate is used to determine both barium and chromate. However, precipitates such as hydroxides, oxalates, and metal ammonium phosphates...

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After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...

Precipitation Gravimetry

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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...

Precipitation of Ions

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Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:

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Related Experiment Video

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Analysis of Organochlorine Pesticides in a Soil Sample by a Modified QuEChERS Approach Using Ammonium Formate

Analysis of Organochlorine Pesticides in a Soil Sample by a Modified QuEChERS Approach Using Ammonium Formate

Published on: January 20, 2023

A cleanup method for perchlorate determination in urine.

Qiuqiong Cheng¹, Fujun Liu, Jaclyn E Cañas

¹The Institute of Environmental and Human Health, Department of Environmental Toxicology, Texas Tech University, Box 41163, Lubbock, TX 79409-1163, USA.

|October 31, 2008

Summary

Concerns about perchlorate exposure are rising due to its thyroid disruption effects and widespread environmental contamination. A new method accurately measures perchlorate in urine, offering a reliable biomarker for exposure assessment.

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Analysis of Organochlorine Pesticides in a Soil Sample by a Modified QuEChERS Approach Using Ammonium Formate

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A Convenient Method for Extraction and Analysis with High-Pressure Liquid Chromatography of Catecholamine Neurotransmitters and Their Metabolites

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Published on: March 1, 2018

Area of Science:

Environmental Science
Toxicology
Analytical Chemistry

Background:

Perchlorate exposure is a growing concern due to its thyroid hormone disrupting potential and widespread environmental presence.
Urine is a primary excretion route for perchlorate, making urinary perchlorate analysis a viable method for exposure assessment.
Accurate perchlorate determination in urine is challenging due to interfering ions and biomolecules that affect ion chromatography.

Purpose of the Study:

To develop an efficient method for determining perchlorate in urine.
To overcome the challenges posed by urine's complex matrix in ion chromatography analysis.
To establish a reliable method for assessing perchlorate exposure through urinary analysis.

Main Methods:

Development of a novel ion chromatography method to reduce background noise in urine samples.
Spiking of urine samples (cow, vole, human) with known concentrations of perchlorate.
Quantification of perchlorate recovery and determination of detection limits.

Main Results:

The developed method effectively reduced the background signal in urine samples.
High perchlorate recoveries were achieved in spiked cow urine samples (67-81%).
Low detection limits for perchlorate were established across different urine matrices (12.3-18.7 µg/L).

Conclusions:

The new method provides a reliable approach for measuring perchlorate in urine.
This method can serve as an effective biomarker for assessing perchlorate exposure in humans and animals.
Further validation could lead to widespread use in environmental and health monitoring programs.