Accession Number:

ADA235504

Title:

Applications of Advanced Multichannel Laser Raman Spectroscopy to Problems in Marine Chemistry

Descriptive Note:

Final rept. 1 Mar-31 Dec 1990

Corporate Author:

HAWAII INST OF GEOPHYSICS HONOLULU

Personal Author(s):

• Sharma, Shiv K.
• Taylor, Gordon

Report Date:

1991-04-23

Pagination or Media Count:

14.0

Abstract:

Laser Raman multichannel spectrometry, and Fourier Transform FT- Raman techniques were evaluated and applied to the analysis of low levels of inorganic nutrients in seawater. The best results were obtained in analyzing nitrite in seawater with an azo-dye scattering SERS with resonance Raman scattering RRS, ie., SERRS, technique using silver colloids. The limit of detection of the azo-dye complex of nitrite with visible laser excitation and the SERRS technique is estimated to be 1 nm in basic seawater solutions and 12 nm in the acidic solutions.

Descriptors:

• *SPECTROMETRY
• *LASERS
• DETECTION
• EXCITATION
• RESONANCE SCATTERING
• NUTRIENTS
• CHEMISTRY
• MARINE ATMOSPHERES
• SOLUTIONS(GENERAL)
• VISIBILITY
• LOW LEVEL
• COLLOIDS
• SEA WATER
• SILVER
• RAMAN SPECTRA
• ACIDS
• INORGANIC MATERIALS
• MULTICHANNEL
• NITRITES
• FOURIER TRANSFORMATION
• LIGHT SCATTERING

Subject Categories:

• Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE