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Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level

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Lead determination at the ppb level using stopped-flow FIA.

M Li¹, G E Pacey

¹Department of Chemistry, Oxford, OH 45056, USA.

|December 1, 1995

Summary

A new flow-injection method accurately determines lead ions using resazurin reduction. This sensitive technique achieves a 1 ppb detection limit, ideal for environmental monitoring.

Area of Science:

Analytical Chemistry
Environmental Science

Background:

Lead ions are toxic environmental pollutants.
Accurate determination of lead is crucial for public health and environmental safety.

Purpose of the Study:

To develop a sensitive and reliable flow-injection kinetic method for lead ion determination.
To assess the method's detection limit and precision.

Main Methods:

Flow-injection analysis (FIA) system.
Kinetic determination based on resazurin reduction to resorufin.
Utilized sulfide and lead ions as reactants.

Main Results:

Achieved a low detection limit of 1 part per billion (ppb) for lead ions.
Demonstrated good precision with a relative standard deviation of 5.2% at the 20 ppb level.

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Identified and addressed potential interferences through prior extraction.

Conclusions:

The developed flow-injection kinetic method offers a sensitive and efficient approach for lead ion analysis.
The method is suitable for quantifying lead in samples where interferences may be present.
This technique contributes to improved environmental monitoring capabilities for heavy metals.