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In vitro adsorption of lithium by bentonite
1Department of Emergency Medicine, Singapore General Hospital, Singapore. gaerpo@sgh.gov.sg
Singapore Medical Journal
|May 8, 2002
Summary
Bentonite effectively adsorbs lithium, particularly in simulated gastric fluid. This finding suggests bentonite as a potential treatment for lithium poisoning, warranting further in vivo investigation.
Area of Science:
- Toxicology
- Pharmacology
- Materials Science
Background:
- Current lithium poisoning management relies on supportive care and hemodialysis, with activated charcoal proving ineffective.
- Sodium Polystyrene Sulphonate (SPS) shows some efficacy but carries risks like gut necrosis, especially in vulnerable patients.
- Bentonite, a known adsorbent used in paraquat poisoning, presents a potential alternative for lithium adsorption.
Purpose of the Study:
- To evaluate the capacity of bentonite to adsorb lithium.
- To compare bentonite's adsorption efficacy in different pH environments.
Main Methods:
- Lithium carbonate stock solution was prepared and mixed with bentonite at various ratios (0.75g, 1.5g, 4.5g) in deionised water and simulated gastric fluid.
- Mixtures were agitated, filtered, and analyzed for lithium concentration using atomic absorption spectrophotometry.
- Control groups without bentonite were included for comparison.
Main Results:
- Bentonite significantly reduced lithium concentration in both deionised water and simulated gastric fluid.
- Adsorption was more pronounced in simulated gastric fluid, with 48.09% lithium reduction at a 30:1 bentonite:lithium ratio.
- A statistically significant result (p=0.005) was observed at the highest ratio in simulated gastric fluid.
Conclusions:
- Bentonite demonstrates significant efficacy as a lithium adsorbent.
- The adsorptive capacity of bentonite for lithium is enhanced under acidic conditions, mimicking gastric fluid.
- Further in vivo studies are recommended to explore clinical applications for bentonite in lithium poisoning management.
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