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Related Experiment Video

Updated: Jun 28, 2026

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies

Clean Sampling and Analysis of River and Estuarine Waters for Trace Metal Studies

Published on: July 1, 2016

Metal speciation by flow-injection analysis.

B P Bubnis¹, M R Straka, G E Pacey

¹Department of Chemistry, Miami University, Oxford, OH 45056, U.S.A.

|November 1, 1983

Summary

This summary is machine-generated.

This study introduces a flow-injection manifold with a switching valve for on-line metal speciation of iron and chromium. The method offers rapid, precise analysis with a high sample throughput.

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Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions

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Area of Science:

Analytical Chemistry
Environmental Chemistry
Inorganic Chemistry

Background:

Accurate determination of metal speciation is crucial for environmental and health assessments.
Existing methods for iron (Fe) and chromium (Cr) speciation can be time-consuming and complex.
On-line speciation analysis offers advantages in speed and reduced sample manipulation.

Purpose of the Study:

To develop and validate a flow-injection analysis (FIA) method for on-line speciation of Fe(II)/Fe(III) and Cr(III)/Cr(VI).
To incorporate a two-channel switching valve for automated control of metal speciation.
To assess the method's linearity, precision, and sample throughput.

Main Methods:

Utilized a two-channel switching valve within a flow-injection manifold.
Employed 1,10-phenanthroline for iron determination and diphenylcarbazide for chromium determination.
Measured absorbances at 512 nm for iron and 540 nm for chromium.

Main Results:

Achieved linear response for Fe (0.5-30.0 ppm) and Cr (0.5-40.0 ppm) using a 30-µL injection loop.
Demonstrated a relative standard deviation of approximately 1% for both metal determinations.
Enabled a sample throughput of at least 180 injections per hour.

Conclusions:

The developed FIA method provides a robust and efficient approach for on-line iron and chromium speciation.
The integration of a switching valve simplifies the analytical procedure and enhances automation.
The method's high precision and throughput make it suitable for routine environmental monitoring.