222800 Chromium Color Disc Test Kit, Model CH-12

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+.