Tatus Of Tungsten Wire In Spectral Analysis

Mar 30, 2020

Although tungsten wires were introduced to atomic absorption spectroscopy in the 1970s, further research began in 1988. The main reason is that graphite furnace atomic absorption spectrometry and inductively coupled plasma atomic emission spectrometry (icp-aes) have achieved great success since 1970s. 

Berndt et al. replaced the graphite furnace atomizer on the commercial graphite furnace atomic absorption spectrometer (gfaas) with tungsten wire in the light bulb (model: HLX64633, 15 V, 150 W) produced by Osram company of Germany, and determined 13 elements. 

They found that when argon containing 10% hydrogen was used as carrier gas, the sensitivity of tungsten wire electrothermal atomic absorption (w-coil ETAAS) was similar to that of gf-etaas. In gf-etaas, the alkali earth metal is easy to form carbide with graphite, which leads to the loss of sensitivity and reduces the service life of graphite tube, while in w-coil ETAAS, these problems no longer exist.