Patent ID: 6808931
Filing Date: 2004-10-26
Classification: G01N,Y10T

Abstract:
A method for the detection of CrVI in a sample, said method comprising:(1) ultrasonic extraction of CrVI from the sample utilizing a first buffer solution having a pH of about 7.2 to 9.0, whereby the pH of the first buffer solution is such that neither significant CrIII oxidation nor CrVI reduction occurs; (2) separation of the CrVI in the ultrasonic extractant from step (1) from any CrIII or other interferents that might be present in the sample by passage of the ultrasonic extractant through a strong anion exchange solid phase extraction media; (3) elution of the CrVI from the media with a second buffer solution having a pH of about 7.2 to 9.0; (4) acidification of the eluate containing the CrVI; and (5) addition of a complexing agent to the acidified eluate to form a colored CrVI complex if CrVI is present in the sample.