Lead sulphate half cell hanna hi4012

Description

Lead sulphate half cell hanna hi4012 

The internal elements are isolated from the sample by a compressed lead sulphide sensing membrane. This solid state sensor requires a separate reference electrode (HI-5315) to complete the measurement system.

The HI-4012 lead/sulphate selective electrode is a potentiometric half-cell sensor housed within an epoxy body. The internal elements are isolated from the sample by a compressed lead sulphide sensing membrane. This solid state sensor requires a separate reference electrode to complete the measurement system.  

For the HI-4012 to measure lead accurately, it is important that the ionic strength of the standards and sample be adjusted to a high and constant value with the lead ionic strength adjuster (ISA) solution. The ISA ensures that the activity coefficient is constant so the concentration of free lead ions can be measured.

Measuring all solutions with a constant ionic strength reduces the margin of error between measurements. The HI-4012 lead/sulphate solid state ISE can measure from 1µM (0.21 mg/L) to 0.1M (20,700 mg/L).

The HI-4012 can also be used as an indicator to follow the progress and detect the endpoint of a precipitation titration of sulphate. During the titration, the lead/sulphate ISE follows the lead concentration while a lead perchlorate solution is used to titrate the sample. The lead in the titrant solution reacts with the sulphate ions present in the sample to form a precipitate. Once all of the lead and sulphate ions have reacted, a change in mV occurs to signal the endpoint, and ultimately the sulphate concentration.

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