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Correction techniques for iodine and bromine interferences in continuous flow aqueous mercury analysis
Diana Babi1, Frank H Schaedlich, Dan R Schneeberger
1Tekran Inc, 330 Nantucket Boulevard, Toronto, Ontario, Canada M1P 2P4. db@tekran.com
Analytical and Bioanalytical Chemistry
|November 30, 2002
Summary
Iodine and bromine interfere with mercury measurements. On-line alkaline pH adjustment effectively corrects this interference in aqueous samples analyzed by continuous flow techniques.
Area of Science:
- Analytical Chemistry
- Environmental Science
Background:
- Mercury measurements are crucial for environmental monitoring.
- Iodine and bromine can interfere with accurate mercury quantification.
Purpose of the Study:
- To investigate iodine and bromine interference in mercury measurements.
- To evaluate methods for correcting this interference in aqueous samples.
Main Methods:
- Utilized continuous flow techniques for mercury analysis.
- Studied the impact of acidity on interference.
- Tested various chemical and physical interference correction methods.
- Evaluated on-line alkaline pH adjustment and tin(II) chloride reduction.
Main Results:
- Acidity plays a role in the extent of iodine and bromine interference.
- On-line alkaline pH adjustment before tin(II) chloride reduction proved most effective.
- Physical modifications to extend reaction time were also explored.
Conclusions:
- Effective interference correction for mercury analysis is achievable.
- On-line alkaline pH adjustment is a robust method for mitigating iodine and bromine interference.