title: A highly sensitive hexachromium monitor using water core optical fiber with UV LED.
abstract: A simply structured, cheap hexachromium monitor was developed. The monitor is based on UV/VIS absorption technique. A 2-m long water core optical fiber was employed as a long path length sample cell and a UV light emitting diode (LED) was used as a light source. The emission profile of the UV LED fits very well with the absorption spectrum of chromate ions in water. Therefore, the light-dispersing element, which is usually used in an optical spectrometer, is not necessary in this monitor design. The water core fiber as a long path length makes the monitor highly sensitive for hexachromium detection. This monitor is specific for hexachromium detection without interference from tri-valence chromium ions. A detection limit of 0.1 ng Cr(VI) ml(-1) was obtained with this simple monitor.
authors.affiliation: Diagnostic Instrumentation and Analysis Laboratory, Mississippi State University, Starkville 39759, USA. tao@dial.msstate.edu
authors.forename: Shiquan
authors.initials: S
authors.lastname: Tao
authors.forename: Christopher B
authors.initials: CB
authors.lastname: Winstead
authors.forename: Hui
authors.initials: H
authors.lastname: Xian
authors.forename: Krunal
authors.initials: K
authors.lastname: Soni
mesh_terms: D000327:Adsorption; D002857:Chromium / Q000032:analysis*; D004784:Environmental Monitoring / Q000295:instrumentation* / Q000379:methods; D005336:Fiber Optic Technology; D055100:Optical Fibers; D012680:Sensitivity and Specificity; D014466:Ultraviolet Rays
chemical_list: D002857:Chromium; C074702:chromium hexavalent ion