Indirect Determination of Liquor Alcohol Content Based on Near-Infrared Spectrophotometry

Yao-qiang HU; Min GUO; Xiu-shen YE; Quan LI; Hai-ning LIU; Zhi-jian WU

doi:10.3964/j.issn.1000-0593(2022)02-0410-05

Spectroscopy and Spectral Analysis, Volume. 42, Issue 2, 410(2022)

Indirect Determination of Liquor Alcohol Content Based on Near-Infrared Spectrophotometry

Yao-qiang HU^1、*, Min GUO^2、2;, Xiu-shen YE^2、2;, Quan LI^2、2;, Hai-ning LIU^{2、2; *;}, and Zhi-jian WU^2、2;

Author Affiliations

¹1. College of Ocean and Meteorology, Guangdong Ocean University, Zhanjiang 524088, China

²2. Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Provincial Key Laboratory of Resources and Chemistry of Salt Lakes, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China

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Figures & Tables(10)

Fig. 1. Effect of optical distance on ultraviolet-visible-near infrared spectral images of water

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Fig. 2. Effect of optical distance on ultraviolet-visible-near infrared spectral images of ethanol

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Fig. 3. Near-infrared spectral images of ethanol aqueous solutions

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Fig. 4. Absorbance fitting curves of ethanol aqueous solutions at 1 448 nm
(a): 0~100%; (b): 20%~80%

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Fig. 5. Absorption spectra of some brand liquors (a) and bulk liquors (b)

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Table 1. Absorbances of water at 1 448 nm with different optical distances
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Table 1. Absorbances of water at 1 448 nm with different optical distances
Optical
distance/mm Absorbance
( 1448 nm) κ/
(L·mol^-1·cm^-1)
1 1.403 0.253
2 2.980 0.269
10 >10 (Invalid value) -

Table 2. Absorbances of ethanol at 1 448 nm with different optical distances
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Table 2. Absorbances of ethanol at 1 448 nm with different optical distances
Reagent Optical
distance/mm Absorbance
(1 448 nm) κ/
(L·mol^-1·cm^-1)
Ethanol 1 0.116 0.067 8
10 1.330 0.077 7

Table 3. Absorbances of ethanol aqueous solutions with different mass ratios at 1 448 nm
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Table 3. Absorbances of ethanol aqueous solutions with different mass ratios at 1 448 nm
Mass ratio of ethanol/% Absorbance (1 448 nm)
0 1.403
10 1.255
20 1.121
30 0.987
40 0.857
50 0.697
60 0.574
70 0.443
80 0.297
90 0.206
100 0.118

Table 4. Absorbance values of ethanol obtained by measurement repeated 6 times
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Table 4. Absorbance values of ethanol obtained by measurement repeated 6 times
A (1 448 nm) 0.118 9 0.118 8 0.118 9 0.118 8 0.118 9 0.118 9

Table 5. Predicted results of verified sample

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Table 5. Predicted results of verified sample

Brand	A (1 448 nm)	Reference value /(%Vol)	Measured value (%Vol)	Relative Deviation
brand 1	0.960	40%	38%	-5.0%
brand 2	0.900	43%	43%	0%
brand 3	0.878	45%	45%	0%
brand 4	0.772	53%	54%	1.9%
brand 5	0.756	54%	55%	1.9%
bulk 1	1.018	42%	33%	-21.4%
bulk 2	0.883	45%	45%	0%
bulk 3	0.891	48%	44%	-8.3%
bulk 4	0.805	50%	51%	2.0%
bulk 5	0.755	53%	55%	3.8%

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Yao-qiang HU, Min GUO, Xiu-shen YE, Quan LI, Hai-ning LIU, Zhi-jian WU. Indirect Determination of Liquor Alcohol Content Based on Near-Infrared Spectrophotometry[J]. Spectroscopy and Spectral Analysis, 2022, 42(2): 410

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