HI4112

Description

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.

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

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

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

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.

SPECIFICATIONS

Type :	combination
Measurement Range :	Lead (Pb²⁺) 0.1M to 1•10^-6M, 20,700 to 0.21 mg/L (ppm)
Optimum pH Range :	pH 4 to 7
Temperature Range :	0 to 80 °C
Approximate Slope :	+27 mV
Diameter :	12 mm
Overall Length :	120 mm
Body Material :	PEI
Cable :	coaxial; 1 m (3.3’)
Connection :	BNC
Warranty :	6 months