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Frontiers of Optoelectronics

Front. Optoelectron.    2015, Vol. 8 Issue (1) : 62-67     DOI: 10.1007/s12200-014-0437-z
Detecting NO--3 concentration in nitrate solutions using terahertz time-domain spectroscopy
Qian LI1,Honglei ZHAN2,Fangli QIN3,Wujun JIN3,Honglan LIU3,Kun ZHAO1,2,3,*()
1. State Key Laboratory of Petroleum Resources and Prospecting, China University of Petroleum, Beijing 102249, China
2. Key Laboratory of Oil and Gas Terahertz Spectroscopy and Photoelectric Detection, China Petroleum and Chemical Industry Federation (CPCIF), Beijing 100723, China
3. Beijing Key Laboratory of Optical Detection Technology for Oil and Gas, China University of Petroleum, Beijing 102249, China
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In this paper, we employed terahertz time domain spectroscopy (THz-TDS) to investigate the nitrate () concentration in four types of nitrate solution (sodium nitrate, aluminum nitrate, calcium nitrate and magnesium nitrate). Their absorption coefficient and refractive index were calculated in 0.2–2.5 THz, and a logarithmic relationship was observed between NO-3 concentrations and selected optical parameters regardless of the kinds of nitrate solution. Partial least square (PLS) model was built between THz-TDS and NO-3 concentration. The correlation coefficient of PLS model was calculated. The results make the quantitative analysis of NO-3 concentration possible by THz-TDS and indicate the bright future in practical application.

Keywords solution      terahertz time-domain spectroscopy (THz-TDS)      nitrate     
Corresponding Authors: Kun ZHAO   
Just Accepted Date: 13 August 2014   Online First Date: 16 September 2014    Issue Date: 13 February 2015
 Cite this article:   
Qian LI,Honglei ZHAN,Fangli QIN, et al. Detecting NO--3 concentration in nitrate solutions using terahertz time-domain spectroscopy[J]. Front. Optoelectron., 2015, 8(1): 62-67.
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Qian LI
Honglei ZHAN
Fangli QIN
Wujun JIN
Honglan LIU
Fig.1  Terahertz time domain spectroscopy (THz-TDS) of reference (empty cell) and nitrate solution samples with different nitrate concentrations CN
Fig.2  Absorption coefficient of samples with different nitrate concentration CN in 0.2-2.5 THz
Fig.3  Refractive index of samples with different nitrate concentration CN in 0.2-2.5 THz
Fig.4  (a) Absorption coefficient and (b) refractive index as a function of the NO-3 concentration cN of NaNO3, Ca (NO3)2, Al(NO3)3 and Mg(NO3)2 solutions at 1.24 THz
Fig.5  Predicted NO-3 concentration against actual concentration from partial least square (PLS) model
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