Lower limits of the potentiometric microtitration of chloride with silver ions
The lower levels of the potentiometric titration of chloride with silver ions were investigated. The titrant was 0.001N acetonic silver perchlorate. The titration media were acetone and acetic anhydride:acetone (4:1). A silver sulfide ion-selective indicator electrode and a double-junction reference electrode were used to monitor emf's. This titration is limited only by the trace amounts of chloride in the reagents used. Satisfactory results and well-defined titration curves were obtained down to 7 ..mu..g of chloride per 50 ml of solution (0.2 ..mu..mol; 4 x 10/sup -6/N). A small polarization current can be used to enhance the potentiometric breaks of this titration. In an 80 percent methanolic medium with 0.001N aqueous silver nitrate and a polarization current of -0.4 ..mu..A, the lower practical limit of this titration was near 22.3 ..mu..g of chloride (1.26 x 10/sup -5/N).
- Research Organization:
- Univ. of California, Livermore
- OSTI ID:
- 7230756
- Journal Information:
- Microchem. J.; (United States), Journal Name: Microchem. J.; (United States) Vol. 21; ISSN MICJA
- Country of Publication:
- United States
- Language:
- English
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