Product Overview

HI4004-00 is a 500 mL bottle of ionic strength adjuster (ISA) solution for calcium ion-selective electrodes. Hanna ISA solutions clearly state the lot number and expiry date on the label and are airtight with a tamper-evident seal to ensure the quality of the solution. Hanna's line of solutions is specially formulated and, for unopened bottles, is valid for 5 years from the date of manufacture.

HI4004-00 is an ionic strength adjuster (ISA) solution for calcium ion-selective electrodes (ISEs). Hanna ISA solutions are formulated to fix the ionic strength of samples and standards so that it remains constant. Without the addition of ISA, an ion-selective electrode measures ion activity; the addition of ISA stabilises the ionic strength and allows the ion concentration to be measured. For some ion-exchange systems, ISA solutions are also used to adjust the pH of the solution or to eliminate any potential interference from competing ions present.

Key Features

• Required for calcium ISE measurements
• Airtight bottle with a tamper-evident seal
• Clearly marked with lot number and expiry date

Airtight bottle with a tamper-evident seal

• Ensures the quality and freshness of the solution

Every bottle is labelled with a lot number and expiry date

• Hanna solutions are specially formulated and, for unopened bottles, are valid for 5 years from the date of manufacture

Instructions for Use

The importance of ISA*

• Fixes the ionic activity of the solution at a constant value so that the concentration can be determined
• Adjusts the pH of the solution as required by certain ISEs
• Complexes interfering ions in the sample in order to measure the free ion of interest

*If the ISA solution is used with samples, it must also be used with the calibration standards in equal proportions.