A Fluorometric Sensor for Cr(VI)

EPA Contract Number: 68D50096
Title: A Fluorometric Sensor for Cr(VI)
Investigators: Henn, Arthur R.
Small Business: Marktek
EPA Contact: Manager, SBIR Program
Phase: I
Project Period: September 1, 1995 through March 1, 1996
Project Amount: $63,204
RFA: Small Business Innovation Research (SBIR) - Phase I (1995) RFA Text |  Recipients Lists
Research Category: Ecological Indicators/Assessment/Restoration , SBIR - Monitoring , Small Business Innovation Research (SBIR)


Hexavalent chromium, Cr(VI), in the usual form of oxo species, is used in many industrial processes and products. As a consequence, Cr(VI)= containing compounds are often found in wastewater and contaminated sites. Since Cr(VI) is considered highly toxic and carcinogenic, it is extremely important to have a reliable, easy-to-use, sensitive monitor for determining Cr(VI) concentrations in process, on site, in real time.

This proposal presents a description of the preliminary research necessary to develop an easy-to-use, portable, sensitive, selective fiber-optic sensor for Cr(VI). The envisioned sensor is based on the reportedly unique ability of Cr(VI) to quench the visible florescence of Rhodamine S, which is to be immobilized in a matrix prepared by proven sol-gel techniques. One of the key objectives of the present research is to verify the rare selectivity of the Rhodamine S system. Because silica sol-gel tends to dissolve in strong base, other oxide gel systems will be investigated as matrices to provide a sensor resistant to highly alkaline media as well.

Supplemental Keywords:

small business, SBIR, air emissions, engineering, chemistry., RFA, Scientific Discipline, Toxics, Waste, Water, Ecosystem Protection/Environmental Exposure & Risk, hexavalent chromium, National Recommended Water Quality, hexavalent chromium waste, Chemistry, Monitoring/Modeling, Analytical Chemistry, Hazardous Waste, Engineering, Hazardous, 33/50, Engineering, Chemistry, & Physics, monitoring, chromium & chromium compounds, continuous measurement, field portable monitoring, Chromium, continuous monitoring, fiber optics, compliance, portable detection system, carcinogens, fluorescence detection, carcinogen, measurement, sensor, real time monitoring, fluorometer, real-time monitoring

Progress and Final Reports:

  • Final