Determination of Cadmium with a Portable,Battery-Powered Tungsten Coil Atomic Absorption Spectrometer

Abstract

A portable atomic absorption spectrometer is described that is powered by a 12 V car battery. The atomization device is a tungsten coil extracted from a common projector lamp bulb. The coil is housed in a glass cell, and the atomization environment is purged with 10% H₂ in Ar (available as a standard commercial welding gas) to prevent oxidation. The detection system is a miniature charge-coupled device (CCD) spectrometer mounted on a PC board. The device is controlled by a laptop computer. Background correction measurements are performed by the near-line method. Aqueous standard solutions provide a Cd detection limit of 3 μg/L (60 pg) for a 20 μL sample volume. Accuracies for the determination of Cd in urine, soil, and stream water are typically better than 90%, with relative standard deviations in the 10% range.

Keywords

Tungsten coil Cadmium Atomic absorption spectrometry Urine Soil Charge-coupled device Near-line background correction

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