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Nickel and zinc determination by flow-injection solid-phase spectrophotometry exploiting different sorption rates
L S Teixeira1, F R Rocha, M Korn
1Instituto de Quimica, Universidade Federal da Bahia, Brazil.
Talanta
|October 31, 2008
Summary
This study introduces a flow-injection spectrophotometry method for sequential nickel and zinc determination using immobilized 1-(2-thiazolylazo)-2-naphthol (TAN). The method leverages differential sorption rates for efficient and accurate metal analysis in alloys.
Area of Science:
- Analytical Chemistry
- Spectrophotometry
- Environmental Analysis
Background:
- Accurate determination of nickel and zinc is crucial for environmental monitoring and material science.
- Existing methods for sequential metal analysis can be time-consuming and complex.
- Solid-phase extraction offers potential for simplifying and enhancing analytical procedures.
Purpose of the Study:
- To develop a sequential flow-injection solid-phase spectrophotometry method for determining nickel and zinc.
- To exploit the differential sorption kinetics of Ni(II) and Zn(II) on immobilized 1-(2-thiazolylazo)-2-naphthol (TAN).
- To validate the method for analyzing nickel and zinc in copper-based alloys.
Main Methods:
- Flow-injection analysis system utilizing C(18)-bonded silica immobilized with TAN.
- Sequential determination based on varying flow rates (0.85 and 1.9 ml min(-1)) to exploit differential sorption rates.
- Spectrophotometric detection at 595 nm for TAN-metal complexes.
Main Results:
- The method achieved high precision with coefficients of variation as low as 1.1% for zinc and 1.2% for nickel.
- Accurate determination of nickel and zinc in copper-based alloys was demonstrated, with results agreeing with certified values.
- A sample throughput of 36 samples per hour was achieved.
Conclusions:
- The developed flow-injection solid-phase spectrophotometry method provides a rapid, precise, and accurate approach for sequential nickel and zinc determination.
- The differential sorption rates on immobilized TAN are effective for sequential metal separation and analysis.
- This method is suitable for the quality control of copper-based alloys.
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