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HI7091L is a reducing pretreatment solution for the conditioning an ORP electrode that is used to measure reduction reactions. Hanna pretreatment solutions have the lot number and expiration date clearly marked on the label and are air tight with a tamper-proof seal to ensure the quality of the solution.
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ORP (Oxidation Reduction Potential) electrodes are used to measure a chemical reaction in which one species is being oxidized and another is being reduced. The loss of electrons by an element or compound is known as oxidation reaction while the gaining of electrons by an element or compound is known as reduction reaction. For example, plating companies that have hexavalent chromium (Cr6+) in their wastewater must reduce it to a safer trivalent chromium (Cr3+) form. This reduction reaction occurs in the presence of a strong reductant such as sodium metabisulfite. The addition of the reductant must be measured with an ORP electrode to ensure that there is an adequate reducing potential. Using the HI7091L reducing pretreatment solution prior to taking a measurement provides for a faster response time in a reducing environment.
To use, soak the ORP electrode in the pretreatment solution for 15 minutes prior to use. As a general rule, if the mV reading corresponding to the pH measurement is lower than the value in the table below the reducing pretreatment solution (HI7091) is used. If the mV reading corresponding to the pH measurement is higher than the value in the table below then the oxidizing pretreatment (HI7092) should be used.
| pH Value | mV Value | pH Value | mV Value | pH Value< | mV Value | pH Value | mV Value | pH Value | mV Value |
| 0 | 990 | 3 | 800 | 6 | 640 | 9 | 460 | 12 | 280 |
| 1 | 920 | 4 | 740 | 7 | 580 | 10 | 400 | 13 | 220 |
| 2 | 860 | 5 | 680 | 8 | 520 | 11 | 340 | 14 | 160 |
| SKU | HI709-25 |
| Name | Manganese High-Range Checker® HC Reagents (25 Tests) – HI709-25 |
| Package | Packets |
| Quantity | 25 |
| Size | adaptation of the Standard Methods for the Examination of Water and Wastewater, 18th edition, Periodate method. The reaction between manganese and reagents causes a pink tint in the sample. |
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To empower customers to achieve quality
by supplying intuitive, accurate, and reliable analytical instruments with exceptional customer service and value.
We take pride in every product we build. From an original idea, to a completed product ready for testing. We oversee every aspect of the manufacturing process. It is this level of attention to detail that sets us apart.
To empower customers to achieve quality by supplying intuitive, accurate, and reliable analytical instruments with exceptional customer service and value.
We take pride in every product we build. From an original idea, to a completed product ready for testing. We oversee every aspect of the manufacturing process. It is this level of attention to detail that sets us apart.
To empower customers to achieve quality by supplying intuitive, accurate, and reliable analytical instruments with exceptional customer service and value.
We take pride in every product we build. From an original idea, to a completed product ready for testing. We oversee every aspect of the manufacturing process. It is this level of attention to detail that sets us apart.
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