1.09119
Potassium dichromate solution
c(K₂Cr₂O₇) = 0.020 mol/l, for determination of COD, ready-to-use volumetric solution for titration, Titripur®
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About This Item
Product Name
Potassium dichromate solution, for determination of COD c(K2Cr2O7) = 0.020 mol/l, Titripur®
Quality Level
product line
Titripur®
form
liquid
quality
Analyzed in our ISO 17025 accredited QC lab
reaction suitability
reaction type: Redox Reactions
concentration
0.02 M
technique(s)
titration: suitable
pH
3.8 (20 °C in H2O)
density
1.0 g/cm3 at 20 °C
storage temp.
15-25°C
Features and Benefits
This volumetric solution is analyzed by our calibration laboratory D-K-15185-01-00 which is accredited according to DIN EN ISO/IEC 17025 for analysis of amount-of-substance concentrations in volumetric solutions by DAkkS (Deutsche Akkreditierungsstelle - German National Accreditation Body). The accreditation certificate can be found at www.sigmaaldrich.com/ISO17025.
Packaging
Analysis Note
Amount-of-substance concentration 0.01990 - 0.02010 mol/L
Measurement uncertainty ± 0.00006 mol/L
Traceability NIST SRM
The concentration is determined by volumetric titration and refers to 20°C.
The amount-of-substance concentration of this volumetric solution is determined with standardized sodium thiosulfate solution (article number 1.09147). The sodium thiosulfate solution is standardized and traceable to a primary standard reference material (SRM) from the National Institute of Standards and Technology, Gaithersburg, USA (NIST SRM 136 potassium dichromate) by means of volumetric standard potassium iodate (article number 1.02404), certified reference material according to ISO 17034, analyzed by our accredited calibration laboratory of Merck KGaA, Darmstadt, Germany according to DIN EN ISO/IEC 17025. The uncertainty is expressed as expanded measurement uncertainty with a coverage factor k=2 covering a confidence level of 95%.
Note: The titer is a correction factor to correct for variations of the volumetric solution, the titration equipment, the temperature and other laboratory conditions. For correct titration results it is recommended to determine a titer with the laboratory specific equipment and under laboratory specific conditions directly after opening a new bottle and at regular time intervals.
Legal Information
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This Item | |||
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| reaction suitability reaction type: Redox Reactions | reaction suitability reaction type: Redox Reactions | reaction suitability reaction type: Redox Reactions | reaction suitability - |
| technique(s) titration: suitable | technique(s) titration: suitable | technique(s) titration: suitable | technique(s) - |
| product line Titripur® | product line Titripur® | product line Titrisol® | product line - |
| storage temp. 15-25°C | storage temp. 15-25°C | storage temp. 15-25°C | storage temp. - |
| density 1.0 g/cm3 at 20 °C | density 1.01 g/cm3 at 20 °C | density 1.06 g/cm3 at 20 °C | density - |
| pH 3.8 (20 °C in H2O) | pH 3.8 (20 °C in H2O) | pH 4.1 (20 °C in H2O) | pH - |
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Danger
Hazard Classifications
Aquatic Chronic 3 - Carc. 1B - Muta. 1B - Repr. 1B
Storage Class
6.1D - Non-combustible, acute toxic Cat.3 / toxic hazardous materials or hazardous materials causing chronic effects
wgk
WGK 3
flash_point_f
Not applicable
flash_point_c
Not applicable
Certificates of Analysis (COA)
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Global Trade Item Number
| SKU | GTIN |
|---|---|
| 1091191000 | 04022536110820 |
| 1091191003 | 04061841065531 |