Two interlaboratory surveys of urine nickel analyses were performed in which eight or nine urine samples were distributed to laboratories in seven nations for measurements of nickel concentrations by atomic absorption spectrometry. In both surveys, wide discrepancies were observed in the values for urine nickel concentrations that were obtained in different laboratories by various analytical me...

Measurement of total and trimethyl lead in mammalian tissue is described, using ion exchange/high performance liquid chromatography in tandem with flameless atomic absorption spectrometry for lead-specific detection. All lead forms in whole blood and homogenates of soft tissue--brain, kidney, and liver--were liberated from tissue binding by treatment with dilute (3N) HCl for a period of 18 hr. ...

We use the coherent backscattering interference effect to investigate experimentally and theoretically how coherent transport of light inside a cold atomic vapor is affected by the residual motion of atomic scatterers. As the temperature of the atomic cloud increases, the interference contrast decreases dramatically. This emphasizes the role of motion-induced decoherence for resonant scatterers...

Selected cultures of mercury-resistant bacteria degrade the fungicide-slimicide phenylmercuric acetate. By means of a closed system incorporating a flameless atomic absorption spectrophotometer and a vapor phase chromatograph, it was demonstrated that elemental mercury vapor and benzene were products of phenylmercuric acetate degradation.

We report a proof-of-principle experiment where the refractive index of an atomic vapor is enhanced while maintaining vanishing absorption of the beam. The key idea is to drive alkali atoms in a vapor with appropriate control lasers and induce a gain resonance and an absorption resonance for a probe beam in a two-photon Raman configuration. The strength and the position of these two resonances ...

This study determined the extent of heavy metal contamination local fruit in Rayong, Thailand, an area where industrial base is adjacent to agricultural areas. Dietary exposure products grown contaminated areas can cause multiple adverse effects human body. In order avoid such undesirable effects, concentrations metals [arsenic (As), cadmium (Cd), copper (Cu), mercury (Hg), lead (Pb), and zinc ...

First posted June 24, 2021 For additional information, contact: Director, Alaska Science CenterU.S. Geological Survey4210 University DriveAnchorage, 99508 Geochemical data are presented for more than 1,500 archived stream-sediment samples and accompanying quality control samples. The sediments were reanalyzed to improve the stream geochemical dataset support ongoing U.S. Survey (USGS) studies. ...