... AD0436058. Title : MODIFIED ISOTOPE DILUTION TECHNIQUE FOR THE DETERMINATION OF OXYGEN IN IRON AND STEEL. ...

Comparisons of estimation of total body H/sub 2/O, Na, K, and Cl in man by isotopic dilution and carcass analysis are presented. Comparable values are achieved in the case of all four tracers in the newborn infant, but only for water in the adult. It would seem proper to continue to refer to results for Na, K, and Cl ...

Isotope dilution inductively coupled plasma mass spectrometry (ICP-MS) has been applied to the determination of 11 trace elements (Cr, Ni, Zn, Sr, Mo, Cd, Sn, Sb, Tl, Pb, and U) in the marine sediment reference materials MESS-1 and BCSS-1. Accuracy and, especially, precision are better than those that can be easily achieved by other ...

A procedure is described for the determination of uranium in calcined ash samples by isotope dilution mass spectrometry. (auth)

A rapid, accurate, sensitive, and simple method for simultaneous speciation analysis of mercury and tin in biological samples has been developed. Integrated simultaneous sample preparation for tin and mercury species includes open focused microwave extraction and derivatization via ethylation. Capillary gas chromatography-inductively plasma mass spectrometry (CGC-ICPMS) conditions and parameters ...

The end of the cold war produced large amounts of excess fissile materials in the United States and Russia. The Department of Energy has initiated numerous activities to focus on identifying material management strategies for disposition of these excess materials. To date, many of these planning strategies have included isotopic dilution of highly enriched ...

The principle of isotope dilution is to add to a known amount of the analyzed solution a known amount of a spiked solution consisting of plutonium 242. The isotopic composition of the resulting mixture is then determined by surface ionization mass spectro...

The objective of the present study is to develop a simple, fast method for detection of aflatoxins in animal feeds. Simultaneous quantitation of four aflatoxins (AFB(1), AFB(2), AFG(1) and AFG(2)) in animal feeds was achieved in a single liquid chromatography/tandem mass spectrometry (LC/MS/MS) run. The solid-phase extraction cleanup step is eliminated with the stable ...

Rockwell Hanford Operations' Analytical Laboratory is using Isotopic Dilution Mass Spectrometry (IDMS) to perform plutonium accountability measurements on the input solutions to the Hanford Plutonium Uranium Extraction (PUREX) facility. A number of decisions were made in the design of the IDMS procedure to satisfy the requirements of highest ...

An isotope dilution mass spectrometric method was developed for the analysis of Tc-99 after isolating it onto anion exchange resin beads. A single resin bead containing Tc-99 and Tc-97 spike is loaded onto a rhenium V-shaped filament for thermal emission mass spectrometry. The application of this technique requires the use of a mass spectrometer of high ...

An isotope dilution gas chromatography/mass spectrometry (GC/MS) method is described for determining atmospheric SO/sub 2/. A cryogenic trapping method was used to enrich the sample to levels detectable by GC/MS. A lower limit of detection of 0.04 pmol was achieved in humid urban air. A 1.7-L sample was required to ...

With this method, results to within 1% can be achieved rapidly and without calibration for ratios such as lesser energy peaks/higher energy peaks within the range 0.5 and 1000. It can also be used, in certain conditions, for measuring isotopic ratios such...

The results of all experiments to date have shown that the resin bead technique is capable of achieving precision and accuracy of better than 0.5% for U and Pu content of spent fuel solutions. The present experiment serves to reinforce this conclusion and...

The National Bureau of Standards (NBS), in conjunction with the Oak Ridge National Laboratory (ORNL) and the Accelerator Mass Spectrometry (AMS) community, is in the process of developing a 10Be/9Be isotopic solution Standard Reference Material (SRM). The starting 10Be/9Be solution was provided by the ORNL after Secondary Ionization Mass Spectrometric characterization for ...

The National Bureau of Standards (NBS), in conjunction with the Oak Ridge National Laboratory (ORNL) and the Accelerator Mass Spectrometry (AMS) community, is in the process of developing a /sup 10/Be//sup 9/Be isotopic solution Standard Reference Material (SRM). The starting /sup 10/Be//sup 9/Be solution was provided by the ORNL after Secondary Ionization Mass Spectrometric ...

Isotope dilution Ar analyses are reported for all samples originally analysed by neutron activation. The methods are in agreement but the more precise and accurate isotope dilution analyses are preferred.

... The proposed method for determining seawater hydrogen concentrations was to use isotope dilution analysis, with deuterium as the diluting gas ...

Uranium isotope ratio and isotope dilution methods by mass spectrometry are used to achieve sensitivity, precision and accuracy for various applications. This report presents recent progress made at SRTC in the analysis of minor isotopes of uranium. Comparison of routine measurements of NBL ...

minerals by mass spectrometric stable isotope dilution has been developed. ... The isotope dilution method of analysis as used in geochemistry has been ...

We propose a new method for the quantitative determination of carbon dioxide released by a biological microgenerator: a suspension of human polymorphonuclear leukocytes (PMNL). This method is based on the reverse isotope dilution analysis by gas chromatography/isotope ratio mass spectrometry of 13CO2 released by PMNL in a controlled ...

Bile acids labeled with stable isotopes in the steroid moiety can be used to characterize bile acid metabolism in man. Isotope dilution studies give information on pool size and input. Biotransformations are easily characterized. Stable isotopically labeled bile acids offer the advantage of freedom from radiation ...

The isotope dilution method of analysis was expanded to allow the addition of twenty or more enriched stable isotopes to a single sample. The method combines the survey capability of spark-source mass spectrometry with the accuracy and precision of isotop...

elements by isotope dilution (figure 5). sample/ chondrite. 10. Radiogenic age dating. Snyder et al. (1997) reported the isotopic composition ...

... of an isotope dilution technique. ... COPPER, SAMPLING, ISOTOPES, MUNITIONS INDUSTRY, CHROMIUM, POTASSIUM, TNT, RDX ...

The purpose of this research was to develop a process for decontaminating irradiated beryllium that will allow it to be disposed of through normal radwaste channels. Thus, the primary objectives of this ongoing study are to remove the transuranic (TRU) isotopes to less than 100 nCi/g and remove {sup 60}Co, and {sup 137}Cs, to levels that will allow the beryllium to be contact ...