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Published on: October 1, 2019
A new titrant for perchlorate: Cetyltrimethylammonium bromide
1Lawrence Livermore Laboratory, University of California, Livermore, California 94550, U.S.A.
Talanta
|November 1, 1979
Summary
Cetyltrimethylammonium bromide offers a more sensitive and cost-effective method for perchlorate precipitation titration compared to tetraphenylarsonium chloride. This technique is effective across a wide pH range, utilizing ion-selective electrodes for potentiometric endpoint detection.
Area of Science:
- Analytical Chemistry
- Electrochemistry
Background:
- Precipitation titration is a common method for determining ion concentrations.
- Existing methods for perchlorate titration, such as using tetraphenylarsonium chloride, have limitations in sensitivity and cost.
- Ion-selective electrodes offer precise potentiometric endpoint detection.
Purpose of the Study:
- To evaluate cetyltrimethylammonium bromide as a titrant for perchlorate determination.
- To compare the sensitivity and cost-effectiveness of this method against existing techniques.
- To determine the optimal conditions, including pH range, for the titration.
Main Methods:
- Precipitation titration using cetyltrimethylammonium bromide as the titrant.
- Potentiometric end-point detection utilizing ion-selective electrodes (perchlorate, fluoroborate, or nitrate).
- Testing the method across a broad pH range (1.20 to 12.8).
Main Results:
- Cetyltrimethylammonium bromide provides a more sensitive titration for perchlorate compared to tetraphenylarsonium chloride.
- The method is effective over a wide pH range (1.20–12.8).
- Cetyltrimethylammonium bromide is significantly more economical than tetraphenylarsonium chloride.
Conclusions:
- Cetyltrimethylammonium bromide is a superior reagent for perchlorate precipitation titration due to its enhanced sensitivity and lower cost.
- The method's wide pH applicability and use of ion-selective electrodes make it a versatile analytical tool.
- This technique presents a practical and efficient alternative for perchlorate analysis in various settings.
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