[Preliminary study on using acousto-optic tunable filter as wavelength selector for atomic absorption spectrometry].
An acousto-optic tunable filter (AOTF) is an all-solid-state, electronic monochromator that is based on the diffraction of light by an acoustic wave in an anisotropic crystal. It is a new kind of tunable small filter with narrow band compared with traditional unicolor filter. The filter can diffract incident white light at a specific wavelength when a specific radio frequency is applied into it. An AAS experimental setup using a microwave plasma torch (MPT) as the atomizer, and a visible AOTF as the wavelength selector was developed and the analytical performance was evaluated by determination of Na. The effect on the absorption signal of some operating conditions, including the observation height, the microwave forward power and the carrier and support gas flow rates for MPT, were investigated. The detection limit for Na was shown to be 0.23 microgram.mL-1 and the relative standard deviation was 2.6% (n = 6).
Zhao
Li-wei
LW
Dept. of Chem., Jilin University, Changchun 130023, China.
Zhang
Yi-hua
YH
Wang
Mei-jia
MJ
Song
Da-qian
DQ
Zhang
Han-qi
HQ
Jin
Qin-han
QH
D000162:Acoustics / Q000295:instrumentation*; D004867:Equipment Design; D005374:Filtration / Q000295:instrumentation* / Q000379:methods; D055095:Optics and Photonics / Q000295:instrumentation; D013054:Spectrophotometry, Atomic / Q000295:instrumentation* / Q000379:methods