Field Determination of Cr(VI) in Water At Low PPB Level

Abstract

Methods for determining chromium (VI) at the ppb level, in tap water and ground water, were developed. These make use of anion exchange resin beads or anion exchange membrane filters to preconcentrate the Cr(VI) and separate it from interfering cations. The color is developed by reaction with diphenylcarbazide and the quantitation is carried out using a portable UV/Vis spectrometer, in the liquid or solid phase, or by visual color matching. These methods are suitable for use in the field.

Key Words:

• Hexavalent chromium
• solid phase spectrophotometry
• diphenylcarbazide
• water analysis