Nitrogen isotope ratio analysis of small samples: sample preparation and calibration
A method for the preparation of samples in the range of 14-100 ..mu..g of organic and precipitated N for mass spectrometric isotope ratio analysis is described. In vacuo combustion and molecular sieve trapping of the sample gas into a 0.5 mL mass spectrometer inlet volume are employed. Samples can be processed at a rate of two to three per hour. The standard deviation of 12 analyses of a peptone preparation was 0.10%. The results of an interlaboratory calibration effort are presented. The materials tested were peptone, thiourea, histidine, kerogen, and two (NH/sub 4/)/sub 2/SO/sub 4/ standards. The results of these comparisons were with the range +/-0.12 delta/sup 15/N or less. Peptone was found to provide a more rigorous test of the combustion and preparation system than nitrogen salts and organic compounds of lower molecular weight. 20 references, 1 figure, 1 table.
- Research Organization:
- Harvard Univ., Cambridge, MA
- OSTI ID:
- 5134948
- Journal Information:
- Anal. Chem.; (United States), Vol. 57:11
- Country of Publication:
- United States
- Language:
- English
Similar Records
Semi-Annual Progress Report for the Period July 1959 through December 1959
New and conventional evaporative systems in concentrating nitrogen samples prior to isotope-ratio analysis
Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AMMONIUM SULFATES
QUANTITATIVE CHEMICAL ANALYSIS
HISTIDINE
KEROGEN
NITROGEN
ISOTOPE RATIO
MASS SPECTROSCOPY
PEPTONE
THIOUREA
CALIBRATION STANDARDS
EXPERIMENTAL DATA
NITROGEN 15
SAMPLE PREPARATION
AMINO ACIDS
AMMONIUM COMPOUNDS
ANTITHYROID DRUGS
AZOLES
BITUMINOUS MATERIALS
CARBONACEOUS MATERIALS
CARBONIC ACID DERIVATIVES
CARBOXYLIC ACIDS
CHEMICAL ANALYSIS
DATA
DRUGS
ELEMENTS
HETEROCYCLIC ACIDS
HETEROCYCLIC COMPOUNDS
HORMONE ANTAGONISTS
IMIDAZOLES
INFORMATION
ISOTOPES
LIGHT NUCLEI
MATERIALS
NITROGEN ISOTOPES
NONMETALS
NUCLEI
NUMERICAL DATA
ODD-EVEN NUCLEI
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC MATTER
ORGANIC NITROGEN COMPOUNDS
ORGANIC SULFUR COMPOUNDS
OXYGEN COMPOUNDS
PROTEINS
SPECTROSCOPY
STABLE ISOTOPES
STANDARDS
SULFATES
SULFUR COMPOUNDS
THIOUREAS
400104* - Spectral Procedures- (-1987)