Hach DR2400 - Page 232

Chromium, Hexavalent
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 ChromiumHex_UniCell_Other_DCH_Eng_Ody.fm
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Method Performance
Precision
Standard: 0.50 mg/L Cr
6+
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
See Section 3.4.5 Sensitivity on page 44 for more information.
Summary of Method
Chromium (VI) ions react with 1,5-diphenylcarbazide to 1,5-di-phenylcarbazone
and Chromium (III), resulting in a red complex. Measurements are taken at
543 nm.
Required Reagents
Description Unit Cat. No.
Chromium - Cr(VI), UniCell™ HCT 156......................................................................... 23/pkg.............. HCT 156
Required Apparatus
Adapter, 16-mm Cell .......................................................................................................... each....................59457-00
Optional Apparatus
Flask, volumetric, 100-mL ................................................................................................. each....................14574-42
Graduated cylinder, mixing, 100-mL............................................................................... each....................20886-42
Pipettor, (Jencons) 1–5 mL................................................................................................. each....................27951-00
Replacement tips for 27951-00 .......................................................................................... pk/100...............27952-00
Pipettor, (Jencons) 100–1000 µL........................................................................................ each....................27949-00
Replacement tips for 27949-00 .......................................................................................... pk/400...............27950-00
pH Paper.............................................................................................................................. pk/100...............26013-00
Optional Reagents
Chromium Standard Solution, 50-mg/L......................................................................... 100 mL..............810-42 H
Metal Prep Set, HCT 200.................................................................................................... 50 digestions.... HCT 200
Program 95% Confidence Limits of Distribution
803 0.38–0.62 mg/L Cr
6+
Program Portion of Curve ∆Abs ∆Concentration
803 Entire range 0.010 0.01 mg/L Cr
6+