Titration systems with precision dosing pumps are available to use with a silver ISE in performing an argentometric titration. Options for titrators include having two analog inputs and two dosing pumps. This configuration allows for a linked titration in which acidity can be measured then silver. A complete system includes an auto sampler that has additional pumps for the acid reagent to be automatically added when the salt titration is performed.
Benchtop pH/ISE meters include two channel options in which a pH probe can be connected to one channel and the silver ISE to the other. The benchtop meters have the ion charge and formula weight pre-programmed for use with the silver ISE. The benchtop meters also have incremental methods pre-programmed including the known addition, known subtraction, analyte addition and analyte subtraction methods.
Portable pH/ISE allow the flexibility to perform an ISE measurement in spaces where there is limited bench space and can be stored in a carrying case when not in use. The meter can accept other ISEs and has the ion charge and weight pre-programmed for the specific parameter.
Electrodes & Probes
The silver/sulfide ISE uses a silver/sulfide pellet. The pellet is practically insoluble in the test solutions being measured and produces a potential change due to changes in the sample’s ion activity. When the ionic strength of the sample is fixed by the addition of ISA, the voltage is proportional to the concentration of silver ions in solution and the electrode follows the Nernst equation.
The silver ISE is available as either a combination design that is complete with a reference cell or a half-cell that is used with a reference electrode. The ISE is a convenient way to measure silver.
Solutions for silver measurement include ISE standards and ISA for calibration and measurement. Other solutions include the CAL Check standards for verifying and, if needed, the calibration of portable photometers. Each CAL Check standard is supplied with a Certificate of Analysis stating the accuracy and traceability of the standard.
Spectrophotometers are available that have silica methods in several ranges pre-programmed into the meter. The spectrophotometer offers the highest precision due to the quality of the optical system that has a wavelength accuracy of +/- 1.5 nm. The spectrophotometer allows for custom methods to be used as well.
Benchtop photometers include multiparameter versions for water quality and environmental analysis. Each photometer is customized to have the parameters used by a specific industry. All benchtop have a digital pH electrode input allowing it to be used as a traditional pH meter.
Single parameter portable photometer is available and it has the Hanna CAL Check feature that allows for performance verification and, if needed, recalibration using the CAL Check standards. The portable meters are available as a meter only or as a kit. The kit version includes a rugged carrying case and CAL Check standards.
In this category are the replacement reagents used with the photometers.
Accessories include spare cuvettes and caps for photometers, magnetic stirrers to ensure adequate mixing when using an ISE.