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Sales: (03) 9769 0666   |    Mon to Fri: 8:30am – 5:00pm
Hanna Instruments Australia
Sales: (03) 9769 0666   |    Mon to Fri: 8:30am – 5:00pm

Lead/Sulfate Combination Ion-Selective Electrode (ISE) - HI4112

$2,263.80


Prices include GST. Not all items are in stock. Call 03 9769 0666 to confirm.

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+

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).

The HI4112 can also be used as an indicator to follow the progress and detect the endpoint of a precipitation titration of sulfate. During the titration, the lead/sulfate 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 sulfate ions present in the sample to form a precipitate. Once all of the lead and sulfate ions have reacted, a change in mV occurs to signal the endpoint, and ultimately the sulfate concentration.

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.

Specifications

SKU HI4112
Name Lead/Sulfate Combination Ion-Selective Electrode (ISE) - HI4112
Description combination
Measurement Range lead (Pb2+) 0.1M to 1 10-6M, 20,700 to 0.21 mg/L (ppm)
Temperature Range 0 to 80 °C
Body Material PEI
Optimum pH Range pH 4 to 7
Body Length/Overall Length 120 mm
Outer Diameter 12 mm
Cable coaxial; 1 m (3.3’)
Connector Type BNC
Notes Approximate Slope +27 mV

Manuals

Purchase & Shipping

All prices are inclusive of GST and not all items are stock items, if you require an immediate solution please send an email to sales@hannainst.com.au or call us on (03) 9769 0666.

Free standard delivery: We offer free delivery within Australia on orders over $150, typically arriving within 5 to 7 days. Delivery times may vary depending on the courier service and the recipient's location. Free shipping is not available with other offers or discounts.

Same-day despatch: Place your order before 1 PM Monday to Friday for same-day despatch (leaves our warehouse). Delivery times may vary depending on the courier service and the recipient's location. Subject to stock availability.

Please note that we do not offer shipping to PO Box addresses.

Additional information

Weight 0.45 kg