Fully Automatic Ultratrace Hexavalent Chromium Analyzer
The ultratrace hexavalent chromium analyzer uses post-column derivatization chromatography. Hexavalent chromium in the sample is first separated by ion chromatography and then mixed with a derivatization reagent, diphenylcarbazide. In an acidic environment, the strongly oxidizing hexavalent chromium oxidizes the reagent and forms a purplish-red complex whose optical absorption is measured at 540nm. The analyzer is the first in the industry to use a dual ion-chromatography pump system: the post-column derivatization pump is also a high-performance ion-chromatography pump, reducing delivery pulsation and detection limits. A dedicated PDA detector greatly improves sensitivity and resistance to interference.
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