Abundance and Spectral Characteristics of Molecular Weight Separated Dissolved Organic Matter Released From Biochar at Different Pyrolysis Temperatures

Si-ye WEI; Xing-cheng FAN; Han MAO; Tao CAO; Ao CHENG; Xing-jun FAN; Yue XIE

doi:10.3964/j.issn.1000-0593(2022)06-1809-07

Journals >Spectroscopy and Spectral Analysis >Volume 42 >Issue 6 >Page 1809 > Article

Spectroscopy and Spectral Analysis
Vol. 42, Issue 6, 1809 (2022)

Abundance and Spectral Characteristics of Molecular Weight Separated Dissolved Organic Matter Released From Biochar at Different Pyrolysis Temperatures

Si-ye WEI^1、*, Xing-cheng FAN^3、3;, Han MAO^{1、1; 2;}, Tao CAO^{4、4; 5;}, Ao CHENG^3、3;, Xing-jun FAN^{3、3; *;}, and Yue XIE^3、3;

Author Affiliations

¹1. South China Institute of Environmental Science, Ministry of Ecology and Environment, Guangzhou 510530, China

³3. College of Resources and Environment, Anhui Science and Technology University, Fengyang 233100, China

⁴4. State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China

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DOI: 10.3964/j.issn.1000-0593(2022)06-1809-07 Cite this Article

Si-ye WEI, Xing-cheng FAN, Han MAO, Tao CAO, Ao CHENG, Xing-jun FAN, Yue XIE. Abundance and Spectral Characteristics of Molecular Weight Separated Dissolved Organic Matter Released From Biochar at Different Pyrolysis Temperatures[J]. Spectroscopy and Spectral Analysis, 2022, 42(6): 1809 Copy Citation Text

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$The DOC content of molecular weight fractions in DOM derived from biochars produced at different pyrolysis temperatures$

Fig. 1. The DOC content of molecular weight fractions in DOM derived from biochars produced at different pyrolysis temperatures

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$Distribution of MW fractions in biochar DOM determined(a): DOC; (b): α254$

Fig. 2. Distribution of MW fractions in biochar DOM determined
(a): DOC; (b): α₂₅₄

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$Specific UV-Vis spectra normalized by DOC content for MW fractions from biochar DOM$

Fig. 3. Specific UV-Vis spectra normalized by DOC content for MW fractions from biochar DOM

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$The E2/E3 (a) and SUVA254 (b) values of MW fractions of biochar EOM$

Fig. 4. The E₂/E₃ (a) and SUVA₂₅₄ (b) values of MW fractions of biochar EOM

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$The typical EEM spectra of MW fractions of biochar DOM$

Fig. 5. The typical EEM spectra of MW fractions of biochar DOM

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$The distributions of fluorescence components for MW fractions in different biochar DOM$

Fig. 6. The distributions of fluorescence components for MW fractions in different biochar DOM

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温度/℃	组分	水稻秸秆			猪粪
温度/℃	组分	FI	BIX	HIX	FI	BIX	HIX
300	DOM_bulk	1.75±0.00	0.72±0.01	6.98±0.04	2.53±0.00	1.25±0.00	3.17±0.01
	<1 kDa	1.96±0.22	0.78±0.02	3.65±0.71	2.79±0.06	1.42±0.05	3.02±0.13
	1~5 kDa	1.96±0.02	0.80±0.03	5.05±0.65	2.47±0.04	1.18±0.00	3.83±0.05
	>5 kDa	1.71±0.02	0.67±0.01	9.25±0.31	2.31±0.01	1.13±0.01	3.47±0.16
400	DOM_bulk	1.80±0.00	0.71±0.00	11.36±0.04	2.96±0.00	1.37±0.01	4.68±0.02
	<1 kDa	2.13±0.06	0.75±0.03	3.14±0.85	3.67±0.04	1.57±0.01	5.12±0.40
	1~5 kDa	2.00±0.07	0.74±0.01	8.51±0.52	2.82±0.03	1.21±0.01	5.62±0.34
	>5 kDa	1.78±0.01	0.71±0.00	13.91±0.48	2.46±0.00	1.12±0.00	5.77±0.19
500	DOM_bulk	2.01±0.03	1.01±0.01	7.95±0.14	2.55±0.01	0.78±0.00	12.50±0.01
	<1 kDa	2.21±0.14	0.66±0.02	2.52±0.50	2.93±0.04	0.94±0.04	8.33±0.60
	1~5 kDa	2.07±0.04	0.89±0.01	5.44±0.09	2.44±0.06	0.63±0.01	9.93±0.09
	>5 kDa	1.97±0.01	1.09±0.00	9.50±0.52	2.41±0.01	0.69±0.02	11.61±0.76

Table 1. The FI, BIX and HIX values of MW fractions in different biochar DOM

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