000			03191nab a22003617a 4500
001			68893
003			MX-TxCIM
005			20250620153855.0
008			250604s2024 -us|||p|op||| 00| 0 eng d
022			_a0013-9351
022			_a1096-0953 (Online)
024	8		_ahttps://doi.org/10.1016/j.envres.2024.118716
040			_aMX-TxCIM
041			_aeng
100	0		_aXingying Li _939107
245	1	4	_aThe impact of microbial community structure changes on the migration and release of typical heavy metal (loid)s during the revegetation process of mercury-thallium mining waste slag
260			_aUnited States of America : _bElsevier, _c2024.
500			_aPeer review
520			_aThe effect of changes in microbial community structure on the migration and release of toxic heavy metal (loid)s is often ignored in ecological restoration. Here, we investigated a multi-metal (mercury and thallium, Tl) mine waste slag. With particular focus on its strong acidity, poor nutrition, and high toxicity pollution characteristics, we added fish manure and carbonate to the slag as environmental-friendly amendments. On this basis, ryegrass, which is suitable for the remediation of metal waste dumps, was then planted for ecological restoration. We finally explored the influence of changes in microbial community structure on the release of Tl and As in the waste slag during vegetation reconstruction. The results show that the combination of fish manure and carbonate temporarily halted the release of Tl, but subsequently promoted the release of Tl and arsenic (As), which was closely related to changes in the microbial community structure in the waste slag after fish manure and carbonate addition. The main reason for these patterns was that in the early stage of the experiment, Bacillaceae inhibited the release of Tl by secreting extracellular polymeric substances; with increasing time, Actinobacteriota became the dominant bacterium, which promoted the migration and release of Tl by mycelial disintegration of minerals. In addition, the exogenously added organic matter acted as an electron transport medium for reducing microorganisms and thus helped to reduce nitrate or As (Ⅴ) in the substrate, which reduced the redox potential of the waste slag and promoted As release. At the same time, the phylum Firmicutes, including specific dissimilatory As-reducing bacteria that are capable of converting As into a more soluble form, further promoted the release of As. Our findings provide a theoretical basis for guiding the ecological restoration of relevant heavy-metal (loid) mine waste dumps.
546			_aText in English
650		7	_aMercury _2AGROVOC _927211
650		7	_aThallium _2AGROVOC _939104
650		7	_aRevegetation plants _2AGROVOC _939105
650		7	_aHeavy metals _2AGROVOC _915863
650		0	_aMigration _2AGROVOC _98944
650		7	_aBacterial counting _2AGROVOC _939106
700	0		_aYonggui Wu _939108
700	0		_aKaizhi Yang _939109
700	0		_aMei Zhu _939110
700	0		_aJichang Wen _939111
773	0		_dUnited States of America : Elsevier, 2024. _gv. 251, part. 2, art. 118716 _tEnvironmental Research _x0013-9351
942			_2ddc _cJA _n0
999			_c68893 _d68885