Biochar-derived Dissolved Organic Matter Extracted by Different Methods: Property Study

doi:10.11924/j.issn.1000-6850.casb2022-0434

Abstract

Abstract:

This study aims at investigating the impact of different extraction methods on the properties of dissolved organic matter (DOM) derived from biochar. Biochar was used as material, DOM was extracted with various extracting agents and extraction patterns, and the carbon content and chemical composition of the extracts were analyzed. The results showed that the DOC content of alkali extract in low-temperature biochar was relatively high (15.6-40.0 g/kg), so was the DOC content of salt extract in high-temperature biochar (0.27-7.04 g/kg). The chemical composition of DOM in the acid extract remained relatively simple, showing that SUVA₂₅₄ and SUVA₂₈₀ were low. A higher proportion of hydrophilic DOM was found in the acid extract from cornstalk-derived biochar (44.6%-73.6%) compared with that in the water and alkali extracts (11.0%-53.2% and 0.30%-31.4%), respectively (P<0.05). Correspondingly, the chemical composition of DOM in the alkali extract was relatively complex, showing that SUVA₂₅₄ and SUVA₂₈₀ were high. A higher proportion of hydrophobic DOM was found in the alkali extract from cornstalk-derived biochar (68.6%-99.7%) compared with that in the acid and salt extracts (26.4%-55.4% and 0%-46.9%), respectively (P<0.05). The study indicates that extracting agents have certain significance in biochar DOM extraction, while extraction patterns exhibit a minor effect on the properties of biochar DOM. It could provide reference for selecting biochar DOM extraction method.

Key words: biochar, dissolved organic matter, extraction method, chemical composition, soil heavy metal contamination remediation

ZHENG Xiaodong, LI Xiang, WEI Lan, HUANG Lianxi, CHEN Weisheng, HUANG Yufen, HUANG Qing, LIU Zhongzhen. Biochar-derived Dissolved Organic Matter Extracted by Different Methods: Property Study[J]. Chinese Agricultural Science Bulletin, 2023, 39(12): 61-68.

Figures/Tables 6

References 39

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生物质炭类型	表面积/(m²/g)	孔直径/nm	N/%	C/%	H/%	H/C	O/C
玉米秆-低温	3.33	1.36	2.75	53.7	3.70	0.07	0.74
玉米秆-高温	3.05	4.72	1.59	65.2	2.02	0.03	0.48
猪粪-低温	16.2	1.18	2.23	19.4	1.75	0.09	3.92
猪粪-高温	52.5	1.19	0.33	9.59	0.92	0.10	9.20

生物质炭类型	表面积/(m²/g)	孔直径/nm	N/%	C/%	H/%	H/C	O/C
玉米秆-低温	3.33	1.36	2.75	53.7	3.70	0.07	0.74
玉米秆-高温	3.05	4.72	1.59	65.2	2.02	0.03	0.48
猪粪-低温	16.2	1.18	2.23	19.4	1.75	0.09	3.92
猪粪-高温	52.5	1.19	0.33	9.59	0.92	0.10	9.20

Hi-DOM组分/%
生物质炭原料	编号	水	酸	碱	盐
玉米秆	1	53.2	73.6	31.4	46.6
	2	25.4	44.6	0.3	82.4
	3	35.1	60.5	17.3	57.5
	4	11	63.2	20.2	100
猪粪	1	57.1	53.4	80.8	67.2
	2	90.6	62	93.8	100
	3	81.1	78.7	75.4	87.4
	4	100	81	100	89
玉米秆	1	46.7	26.4	68.6	46.9
	2	74.6	55.4	99.7	17.6
	3	64.9	38.7	82.7	42.5
	4	89	36.8	79.8	0
猪粪	1	42.9	46.6	19.2	32.8
	2	9.4	38	6.2	0
	3	18.9	21.3	24.6	12.6
	4	0	19	0	11

Hi-DOM组分/%
生物质炭原料	编号	水	酸	碱	盐
玉米秆	1	53.2	73.6	31.4	46.6
	2	25.4	44.6	0.3	82.4
	3	35.1	60.5	17.3	57.5
	4	11	63.2	20.2	100
猪粪	1	57.1	53.4	80.8	67.2
	2	90.6	62	93.8	100
	3	81.1	78.7	75.4	87.4
	4	100	81	100	89
玉米秆	1	46.7	26.4	68.6	46.9
	2	74.6	55.4	99.7	17.6
	3	64.9	38.7	82.7	42.5
	4	89	36.8	79.8	0
猪粪	1	42.9	46.6	19.2	32.8
	2	9.4	38	6.2	0
	3	18.9	21.3	24.6	12.6
	4	0	19	0	11