Correction for turbidity and pH interference for in situ hexavalent chromium monitoring - 16297

Conference · Fri Jul 01 04:00:00 EDT 2016

OSTI ID:22838143

Carter, Janine; Hall, Stephen ^[1]

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1. Freestone Environmental Services, Inc., 1100 Jadwin Ave., Suite 250, Richland, WA 99352 (United States)

Hexavalent chromium is of increasing concern worldwide because of its toxicity, mobility in aqueous media, and relative abundance in waste effluent from a variety of industrial processes. Some of that waste has reached groundwater aquifers. Because of these factors, the fate and transport of hexavalent chromium in aquifers is of great importance for evaluating risk to fresh water sources and to the biosphere, and for designing means for abatement or remediation. Conventional sampling and analysis of groundwater samples from wells is labor intensive and therefore budget limited. The result is inadequate temporal and spatial characterization of contaminant plumes with respect to rate of movement, concentrations, and contaminant flux. A submersible hexavalent chromium sensor designed for extended-term deployment and based on ultraviolet colorimetry has been developed and tested at the Hanford Site, Washington. Adaptation of the method for in situ measurements requires automatic correction for sample turbidity and pH for every measurement. Turbidity is compensated nephelometrically. A method for estimating sample pH based on absorbance measurements made using two different wavelengths is presented. (authors)

• Research Organization: WM Symposia, Inc., PO Box 27646, 85285-7646 Tempe, AZ (United States)
• OSTI ID: 22838143
• Report Number(s): INIS-US--19-WM-16297
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
ABSORPTION SPECTROSCOPY
CHROMIUM
CONCENTRATION RATIO
CORRECTIONS
GROUND WATER
HANFORD RESERVATION
HAZARDS
PERSONNEL
PH VALUE
RADIATION MONITORING
RADIOACTIVE WASTES
REMEDIAL ACTION
TOXICITY
TRANSPORT
ULTRAVIOLET RADIATION