TY - JOUR
T1 - Detection of chromium aerosol using time-resolved laser-induced plasma spectroscopy
AU - Martin, Madhavi
AU - Cheng, Meng Dawn
PY - 2000/9
Y1 - 2000/9
N2 - Time-resolved laser-induced plasma spectroscopy (LIPS) has been used as a tool for the detection of chromium in aerosol. In this article, LIPS has been used to achieve the lowest limits of detection for chromium (400 ng/dscm) in droplets. A comparison with other LIPS instruments and inductively coupled plasma atomic emission spectroscopy (ICP-AES) shows that the limits of detection for chromium metal in aerosol range from 12 to 60 μg/dscm and 200 ng/dscm for LIPS and ICP-AES, respectively. We have studied the effects of laser wavelength, excitation energy, and optimum spectrometer delay time to optimize these low limits of detection. A Nd:YAG laser with output wavelengths of 1064, 532, and 266 nm has been used to study the effects of wavelength on laser energy and aerosol interactions - specifically, plasma initiation and efficiency of ionization in the detection of elemental species. Measured time-resolved spectra are used to establish the most appropriate time delay producing an optimum signal-to-background ratio.
AB - Time-resolved laser-induced plasma spectroscopy (LIPS) has been used as a tool for the detection of chromium in aerosol. In this article, LIPS has been used to achieve the lowest limits of detection for chromium (400 ng/dscm) in droplets. A comparison with other LIPS instruments and inductively coupled plasma atomic emission spectroscopy (ICP-AES) shows that the limits of detection for chromium metal in aerosol range from 12 to 60 μg/dscm and 200 ng/dscm for LIPS and ICP-AES, respectively. We have studied the effects of laser wavelength, excitation energy, and optimum spectrometer delay time to optimize these low limits of detection. A Nd:YAG laser with output wavelengths of 1064, 532, and 266 nm has been used to study the effects of wavelength on laser energy and aerosol interactions - specifically, plasma initiation and efficiency of ionization in the detection of elemental species. Measured time-resolved spectra are used to establish the most appropriate time delay producing an optimum signal-to-background ratio.
UR - http://www.scopus.com/inward/record.url?scp=0034271077&partnerID=8YFLogxK
U2 - 10.1366/0003702001951192
DO - 10.1366/0003702001951192
M3 - Article
AN - SCOPUS:0034271077
SN - 0003-7028
VL - 54
SP - 1279
EP - 1285
JO - Applied Spectroscopy
JF - Applied Spectroscopy
IS - 9
ER -