For hexavalent and total chromium analysis in water samples from cooling towers and engine cooling systems.
Model CH-12 is required for determination of hexavalent and total chromium in the range of 0 - 1.3 mg/L Cr⁶+ in water samples from cooling towers and engine cooling systems by Color Disc/ Diphenylcarbazide, Hypobromite oxidation method. Test Kit may be used to analyze 50 samples. The smallest increment is 0.1 mg/L Cr⁶+.
Chromium Test Set includes:
- Acid Reagent Powder Pillows (p/n 212699)
- Chromium 1 Reagent Powder Pillows (p/n 204399)
- Chromium 2 Reagent Powder Pillows (p/n 204499)
- ChromaVer® 3 Chromium Reagent Powder Pillows (p/n 1271099)
- 29 mL Square Bottle, with 10, 15, 20 and 23-mL marks (p/n 232706)
- Test Tube Holder Clamp (p/n 63400)
- Chromium Color disc, indoor light, 0-1.3 mg/L (p/n 9265300)
- Chromium Color disc, outdoor light, 0-1.3 mg/L (p/n 9267400)
- Color Comparator Box (p/n 173200)
- Cookit Stove with Heatab fuel tablets (p/n 220600)
- Cookit Support Cover (p/n 217900)
- 50 mL Erlenmeyer Flask (p/n 50541)
- Heatab Fuel Tabletstube for Cookit Stove (p/n 220700)
- 18 mm Glass Viewing Tubes (p/n 173006)
- Stoppers for 18-mm Glass Tubes and AccuVac Ampuls (p/n 173106)
Procedure for Cr⁶+ determination
Before you start take into account the following:
- Subtract the testing results of a separate hexavalent chromium test from the testing results of the total chromium test to calculate trivalent chromium.
- Multiply the testing results by 2.23 to record value as mg/L CrO₄²-.
- Multiply the testing results by 3.12 to record the value as mg/L Na₂CrO₄.
Testing procedure
For determination of hexavalent chromium in the range of 0 - 1.3 mg/L Cr⁶+, add 5 mL of sample into two tubes. Install the first tube into the left opening of the color comparator box. Pour the content of ChromaVer 3 Chromium Reagent Powder Pillow into the second tube, set the stopper on the tube and shake the second tube. The purple color develops as the result of the reaction. After 5 minutes, insert the second tube into the color comparator box. Rotate the color disc to match the color. Read the testing results in mg/L in the scale window.
See manual for additional information regarding total chromium evaluation in the range of 0 - 1.3 mg/L Cr⁶+.
Brand | Hach |
Parameter | Chromium Hexavalent, Chromium Total |
Measuring range | 0 - 1.3 mg/L Cr |
Smallest Increments Steps | 0.1 |
Method | Color Disc/ Diphenylcarbazide, Hypobromite oxidation method |
Model | CH-12 |
Number of tests | 50 tests |