Lead/Sulfate Combination Ion Selective Electrode (ISE)

HI4112

Lead/Sulfate Combination Ion Selective Electrode (ISE)

$1,199.99

The HI4112 is a solid state, combination ion selective electrode (ISE) for the determination of lead (Pb2+) in solution and indicator for sulfate in titrations. The lead sulfide sensing pellet produces a potential change due to the ion exchange between the inorganic pellet membrane and the sample. The internal sensing elements are housed within a durable polyetherimide (PEI) body. The HI4112 is ideal for a variety of applications in the plating industry and environmental monitoring.

Solid state sensor
Skirted cone geometry
Detection from 0.21 to 20,700 mg/L Pb2+

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The HI4112 lead/sulfate selective electrode is a complete potentiometric cell that contains a silver/silver chloride (Ag/AgCl) reference housed within a PEI plastic body with a potassium nitrate electrolyte. The internal elements are isolated from the sample by a compressed lead sulfide sensing membrane.

Hanna’s solid-state combination ISEs are designed with a cone style junction. The skirted cone geometry of the sensor forms the liquid junction with the test solution at the tip of the junction cone, producing a highly stable reference potential and consistent flow rates of electrolyte into the solution. A simple press of the top portion of the ISE makes it easy to empty the electrolyte fill solution and replace when necessary.

For the HI4112 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 HI4112 lead/sulfate solid-state ISE can measure from 1µM (0.21 mg/L) to 0.1M (20,700 mg/L).

Conversion Table for Pb²⁺

	Multiply
moles/L (M) to ppm (mg/L)	2.072 x 10⁵
ppm (mg/L) to M (moles/L)	4.826 x 10^-6

Features at-a-glance

Fixed Sensing Modules

Combination solid-state ISEs are electrodes that detect free ions in a solution. The highly insoluble, compressed sensing pellet is attached to the electrode by a fixed sensing module for ease of use.

Durable PEI Body

The probe body is composed of durable polyetherimide (PEI) plastic.

BNC Connection

The HI4112 has a universal BNC connector for easy connection to any benchtop meter with a female BNC probe input.

Theory of Operation

A solid-state sensor electrode develops a voltage due to the ion exchange that occurs between the solution and the inorganic membrane. An equilibrium occurs due to the highly limited solubility of the membrane material in the sample. When the ionic strength of the solution is fixed by the addition of ISA, the voltage is proportional to the concentration of free ions in solution.

Resources

Specifications

Specification Name	Detail
SKU	HI4112
Type	solid-state; combination
Optimum pH Range	4 to 7
Temperature Range	0 to 80°C
Diameter	12 mm
Length	120 mm
Body Material	PEI
Cable	1 m coaxial
Common Applications	determination of lead ions in plating baths and as an indicator for titrations
Connection	BNC
Warranty	6 months

Manuals

Manual Download