The HI3810 is a chemical test kit that measures dissolved oxygen by modified Winkler titration. The HI3810 is supplied complete with all of the reagents and equipment necessary to perform approximately 110 tests.
Complete setup
All required materials are included with the test kit, such as the glass stoppered bottle, indicator and reagent bottles, and calibrated syringe.
High resolution
Readings from 0 to 10 mg/L are determined to 0.1 mg/L resolution.
Replacement reagents available
There is no need to buy a new kit when reagents are exhausted. The HI3810-100 can be ordered to replace the reagents supplied with the kit.
A modified Winkler method is used in the HI3810 test kit. Manganous ions react with oxygen in the presence of potassium hydroxide to form a manganese oxide precipitate (Step 1). An azide is present to prevent any nitrite ions from interfering with the test. With addition of acid, manganese oxide hydroxide oxidizes the iodide to iodine (Step 2). Since the amount of iodine generated is equivalent to the oxygen in the sample, the concentration of iodine is calculated by titration of thiosulfate ions that reduce the iodine back to iodide ions (Step 3).
Step 1: 2Mn2+ + O2 + 4OH- → 2MnO(OH)2
Step 2: MnO(OH)2 + 2I- + 4H+ → Mn2+ + I2 + 3H2O
Step 3: I2 + 2S2O32-- + S4O62-
| Range | 0.0 to 10.0 mg/L O₂ |
|---|---|
| Resolution | 0.1 m/L |
| Method | modified Winkler |
| Number of Tests | 110 |
| CTK Type | Titration |
| Ordering Information | HI3810 test kit comes with 30 mL manganous sulfate solution, 30 mL alkali-azide reagent, 60 mL sulfuric acid solution (2), 10 mL starch indicator, 120 mL titrant solution, glass bottle with stopper, 10 mL calibrated vessel, and calibrated syringe with tip. |
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3810 |
