Determination of trace-level iodine in biological and botanical reference materials by isotope-dilution mass spectrometry
Technical Report
·
OSTI ID:5361874
A method was developed for the determination of trace-level iodine in biological and botanical materials. The method consists of spiking a sample with {sup 129}I, equilibration of the spike with the natural iodine, wet ashing under carefully controlled conditions, and separation of the iodine by co-precipitation with silver chloride. Measurement of the {sup 129}I/{sup 127}I ratio is accomplished by negative thermal ionization mass spectrometry using LaB{sub 6} for ionization enhancement. The application of the method to the certification of trace iodine in two Standard Reference Materials is described.
- Research Organization:
- National Inst. of Standards and Technology, Gaithersburg, MD (USA)
- OSTI ID:
- 5361874
- Report Number(s):
- PB-89-235642/XAB
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400101* -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
550201 -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
BIOLOGICAL MATERIALS
BODY FLUIDS
CALIBRATION STANDARDS
CHEMICAL ANALYSIS
ELEMENTS
FOOD
HALOGENS
IODINE
ISOTOPE APPLICATIONS
ISOTOPE DILUTION
LANTHANUM COMPOUNDS
MASS SPECTROSCOPY
MATERIALS
MILK
NONMETALS
QUANTITATIVE CHEMICAL ANALYSIS
RADIOCHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
SPECTROSCOPY
STANDARDS
TRACE AMOUNTS
TRACER TECHNIQUES
400101* -- Activation
Nuclear Reaction
Radiometric & Radiochemical Procedures
550201 -- Biochemistry-- Tracer Techniques
59 BASIC BIOLOGICAL SCIENCES
BIOLOGICAL MATERIALS
BODY FLUIDS
CALIBRATION STANDARDS
CHEMICAL ANALYSIS
ELEMENTS
FOOD
HALOGENS
IODINE
ISOTOPE APPLICATIONS
ISOTOPE DILUTION
LANTHANUM COMPOUNDS
MASS SPECTROSCOPY
MATERIALS
MILK
NONMETALS
QUANTITATIVE CHEMICAL ANALYSIS
RADIOCHEMICAL ANALYSIS
RARE EARTH COMPOUNDS
SPECTROSCOPY
STANDARDS
TRACE AMOUNTS
TRACER TECHNIQUES