Accession Number:

ADA214238

Title:

Use of Micellularized P-Tosyl-8-Aminoquinoline for Direct Detection of Nanomolar Levels of Zinc and Cadmium in Aqueous Solutions

Descriptive Note:

Presentation paper

Corporate Author:

NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA

Report Date:

1989-09-01

Pagination or Media Count:

2.0

Abstract:

Our research has been directed toward developing a remote, real-time fiber-optic sensor for detection of metal species in seawater. Detection is dependent upon measuring the fluorescence of water soluble metal-ligand complexes in solutions. Discrimination of different ions complexing with the same ligand is accomplished with time-resolved fluorescence, using a pulsed technique. Instrumentation consists of an OMA III system with an intensified linear photodiode array detector, monochrometer, pulsed nitrogen laser, and bifurcated fiber-optic cable for transmission of light to the sample and back to the detector. Direct detection of a specific ion in a complex matrix such as seawater, using fluorescence techniques, requires a ligand that is water soluble and will fluoresce with few species other than the target ion. Boshevolnov 1965 and others have indicated that fluorescence of the ligand p-tosyl-8-aminoquinoline pTAQ is limited to complexes formed with zinc and cadmium. Unfortunately, pTAQ is insoluble in water in the pH range between 3 and 11, making direct use of it in natural waters impossible. Use of a micellular system consisting of the nonionic surfactant Triton X-100 and pTAQ allowed it to be directly dissolved in water. Fluorescence spectroscopy, Fiber optics. jes

Subject Categories:

  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE