Product Overview

• HI7091L is a reducing pretreatment solution used to condition ORP electrodes for measuring reduction reactions. The labels on Hanna pretreatment solutions clearly indicate the lot number and expiration date and feature a tamper-evident seal to ensure the quality of the solution.

• Prepared with reagent-grade chemicals

• Fast response conditioning for ORP electrodes

• Airtight seal to ensure solution quality

• ORP (oxidation-reduction potential) electrodes are used to measure chemical reactions in which one substance is oxidized while another is reduced. The loss of electrons by an element or compound is called oxidation, while the gain of electrons by an element or compound is called reduction. For example, a plating company whose wastewater contains hexavalent chromium (Cr6+) must reduce it to the safer trivalent chromium (Cr3+) form. This reduction reaction occurs in the presence of a strong reducing agent such as sodium metabisulfite. The amount of reducing agent added must be measured with an ORP electrode to ensure sufficient reduction potential. Using HI7091L reducing pretreatment solution before measurement can provide faster response times in reducing environments.

• Before use, soak the ORP electrode in the pretreatment solution for 15 minutes. In general, if the mV reading corresponding to the pH measurement is below the value in the table below, use the reducing pretreatment solution (HI7091). If the mV reading corresponding to the pH measurement is above the value in the table below, use the oxidizing pretreatment (HI7092).

• HI7091 bottles are labeled with

• Product code

• Lot number

• Expiration date

• Airtight bottle with tamper-evident seal

• Ensures the quality and freshness of the solution