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Determination of iodine by atomic-absorption spectrometry using the platinum-loop technique
J M Manfield1, T S West, R M Dagnall
1Chemistry Department Imperial College of Science and Technology London SW7 2AY UK.
This study introduces a new atomic-absorption method for mercury determination using a platinum-loop atomizer and electrodeless discharge lamp. The technique achieves high sensitivity but requires cation-exchange and solvent-extraction to manage interferences.
Area of Science:
- Analytical Chemistry
- Spectroscopy
Background:
- Atomic-absorption spectroscopy (AAS) is a key analytical technique.
- Mercury determination requires sensitive and specific methods.
- Interferences are a common challenge in AAS.
Purpose of the Study:
- To develop an atomic-absorption method for mercury determination.
- To optimize the use of a platinum-loop atomizer and electrodeless discharge lamp for mercury analysis.
- To address interferences in mercury determination using AAS.
Main Methods:
- Atomic-absorption determination of mercury at the 183.0-nm resonance line.
- Utilized a platinum-loop atomizer and an electrodeless discharge lamp.
- Employed argon gas to flush oxygen from the light path.
- Applied cation-exchange and solvent-extraction for interference removal.
Main Results:
- Achieved adequate radiation transmission characteristics.
- Demonstrated a sensitivity of 9 ppm of iodine for 1% absorption.
- Identified susceptibility to both cationic and anionic interferences.
- Showcased the effectiveness of cation-exchange and solvent-extraction in mitigating interferences.
Conclusions:
- The developed atomic-absorption method is sensitive for mercury determination.
- Interferences can be effectively managed using specific separation techniques.
- This method offers a viable approach for mercury analysis in certain contexts.
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