Related Experiment Video
Updated: Jul 3, 2026

Separation of Uranium and Thorium for 230Th-U Dating of Submarine Hydrothermal Sulfides
Published on: May 20, 2019
Thulium hydroxide: a new coprecipitant for speciation of chromium in natural water samples
Funda Armagan Aydin1, Mustafa Soylak
1Erciyes University, Faculty of Art and Science, Department of Chemistry, 38039 Kayseri, Turkey.
Abstract:
A coprecipitation procedure has been established for chromium speciation in natural water samples. The procedure is based on the coprecipitation of Cr(III) on thulium hydroxide precipitate. After reduction of Cr(VI) to Cr(III) by using potassium iodide, the presented method was applied to the determination of the total chromium. The level of Cr(VI) is calculated by difference of total chromium and Cr(III) levels. The procedure was optimized for some analytical parameters including pH, sample volume, matrix effects, etc. The detection limits based on 3sigma criterion were 0.87 microg L(-1) for Cr(III) and 1.18 microg L(-1) for Cr(VI). The procedure presented was validated by the analysis of BCR-144R Sewage Sludge (domestic origin). The presented method was applied for the speciation of chromium in environmental sample with satisfactory results (recoveries>95%, R.S.D.s<10%).
Related Concept Videos
Precipitation and Co-precipitation
Gravimetry: Inorganic And Organic Precipitating Agents
Precipitation of Ions
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Precipitation Titration: Endpoint Detection Methods
In the Volhard method, a standard excess of AgNO3 is first added to the...
Qualitative Analysis
For instance, group IV...
Extraction: Advanced Methods

