No abstract

No abstract

Elemental Analysis Using a Handheld X-Ray Fluorescence Spectrometer The U.S. Geological Survey is collecting geologic samples from local stream channels, aquifer materials, and rock outcrops for studies of trace elements in the Mojave Desert, southern California. These samples are collected because geologic materials can release a variety of elements to the environment when exposed to water. The samples are to be analyzed with a handheld X-ray fluorescence (XRF) spectrometer to determine the concentrations of up to 27 elements, including chromium (see "Periodic Table of the Elements" on back page). Why are These Data Collected? The purpose of the XRF data is to determine the presence and concentration of elements in local geologic materials. These data are used for the following purposes: • As a screening tool to guide further data collection and detailed mineralogic and chemical analyses.

No abstract

For more information on the USGS-the Federal source for science about the Earth, its natural and living resources, natural hazards, and the environment-visit http://www.usgs.gov or call 1-888-ASK-USGS.For an overview of USGS information products, including maps, imagery, and publications, visit