Neutron activation analysis of laboratory animal diets.

Volatile nitrosamine contamination of laboratory animal diets.

A number of precautions were taken to ensure the accuracy of the analytical procedures and to avoid artifactual formation of N-nitroso compounds. NDPA (5 ng/g), an NDMA analog which is not normally present in the diets, was added to each powdered sample prior to the vacuum distillation step as an internal (recovery) standard. All reported levels of NDMA and NPYR have been adjusted for the recov...

Methylmercury Contamination of Laboratory Animal Diets

In the midst of research focusing on the neurodevelopmental effects of mercury vapor in rats, we detected significant levels of mercury (30-60 ng/g) in the blood of nonexposed control subjects. We determined that the dominant form of the mercury was organic and that the standard laboratory chow we used in our vivarium was the source of the contamination. The dietary levels were deemed of potent...

Neutron Activation Analysis Neutron Activation Analysis

CONTENT NEUTRON ACTIVATION ANALYSIS

Neutron Activation Analysis

Neutron activation analysis Contents

Introduction Neutron activation analysis (NAA) is a nuclear process used for determining the concentrations of elements in a vast amount of materials. NAA relies on excitation by neutrons so that the treated sample emits gamma-rays. It allows the precise identification and quantification of the elements, above all of the trace elements in the sample. NAA has applications in chemistry but also i...