OXYGEN TEST METHOD: TITRIMETRIC ACC. TO WINKLER WITH TITRATION PIPETTE MCOLORTESTTM

General description

Method: titrimetric, acc. to Winkler, with titration pipette MQuant^®

The sustainability of biological processes in natural waters is essentially depended on a sufficient oxygen content. The oxygen present in water is also consumed by chemical processes and by microorganisms. This MQuant^® Oxygen test (formally MColortest^®) is suitable for the titrimetric determination using a graduated syringe.
It can be used in:

• Groundwater, drinking water, and surface water, seawater
• Aquarium water, waters from aquaculture
• Industrial water and wastewater
• Boiler water and boiler feed water
• Beverages

Method
In alkaline solution, dissolved oxygen oxidizes manganese(II) ions to form manganese(IV) hydroxides (“oxygen fixation”). In strongly acidic solution these yield manganese(III) ions, which in turn oxidize iodide ions to form iodine. This is then titrated with sodium thiosulfate solution against starch as the indicator until the solution becomes entirely colorless. The oxygen concentration is determined from the consumption of titration solution (iodometric determination acc. to Winkler). The oxygen consumption is calculated as the difference between the oxygen content measured immediately after sampling and that measured after n days (n = 2 to 5).

Legal Information

MCOLORTEST is a registered trademark of Merck KGaA, Darmstadt, Germany

MQUANT is a registered trademark of Merck KGaA, Darmstadt, Germany

analyte chemical class(es): oxygenates. Quality Level: 100. web metadata keyword.default: microbialanalysis
microbialanalysis. compatibility: for use with MQUANT^®. titration pipette . detection method: titrimetric. storage temp.: 15-25°C. Pictograms: GHS05,GHS07,GHS08. Signal Word: Danger. Hazard Statements: H290 - H302 - H314 - H373 - H373 - H412. Precautionary Statements: P273 - P280 - P301 + P312 - P303 + P361 + P353 - P305 + P351 + P338 - P314. Hazard Classifications: Acute Tox. 4 Oral - Aquatic Chronic 3 - Eye Dam. 1 - Met. Corr. 1 - Skin Corr. 1A - STOT RE 2 - STOT RE 2 Oral. Target Organs: Brain, Thyroid. Storage Class Code: 8B - Non-combustible, corrosive hazardous materials. WGK: WGK 3. Flash Point(F): Not applicable. Flash Point(C): Not applicable.