Abstract
ABSTRACT The objective of this work was to evaluate the physicochemical and adsorptive characterization of Fe tailing collected in the district of Brumadinho; and verify its effect on Raphanus sativus germination. The material was collected on the surface layer (0-20 cm) and disintegrated for pH, redox potential – Eh, electrical conductivity – EC, OM, cation exchange capacity – CEC, specific surface area – SSA and functional groups characterization. Adsorption studies were conducted using methylene blue (MB). The results of the adsorption studies were analyzed using kinetic models (Elovich, pseudo-first order – PFO and pseudo-second order – PSO) and isotherm models (Freundlich, Langmuir and Sips). The tailing has an acidic pH (5.60), negative ΔpH (-0.30) and low CEC (1.85 cmolc g-1). A high MB adsorption efficiency (96%) was verified. The Elovich model (0.9248<R2<0.9858) best represented the chemical kinetics, and the Freundlich model best describes the MB adsorption process in the tailing (R2 = 0.9609). The maximum adsorption capacity (qm) was equal to 15.08 mg g-1. The presence of Fe tailing positively influenced the germination of R. sativus seeds (73.8%), but stem and root growth were inferior when compared to seedlings cultivated in compost substrate. It is concluded that the material has favorable cationic adsorption capacity, which can benefit soil fertilization. However, R. sativus development was minor in Fe tailing substrate, probably due to low CEC, OM and nutrient availability.
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Claims 10
Claim · model-written summary
The Fe tailing has an acidic pH of 5.60.
Not reportedTaxon
Verbatim
e2“The tailing has an acidic pH (5.60)”
Claim · model-written summary
The Fe tailing has a negative pH change (delta pH) of -0.30.
Not reportedTaxon
Verbatim
e3“negative ΔpH (-0.30)”
Claim · model-written summary
The Fe tailing has a low cation exchange capacity of 1.85 cmolc g-1.
Not reportedTaxon
Verbatim
e4“low CEC (1.85 cmolc g-1)”
Claim · model-written summary
The Fe tailing showed a high methylene blue adsorption efficiency of 96%.
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Verbatim
e5“A high MB adsorption efficiency (96%) was verified”
Claim · model-written summary
The Elovich kinetic model best represented the chemical kinetics of methylene blue adsorption on the tailing (0.9248<R2<0.9858).
Not reportedTaxon
Verbatim
e6“The Elovich model (0.9248<R2<0.9858) best represented the chemical kinetics”
Claim · model-written summary
The Freundlich isotherm model best described the methylene blue adsorption in the tailing (R2 = 0.9609).
Not reportedTaxon
Verbatim
e7“the Freundlich model best describes the MB adsorption process in the tailing (R2 = 0.9609)”
Claim · model-written summary
The maximum adsorption capacity of the tailing was 15.08 mg g-1.
Not reportedTaxon
Verbatim
e1“The maximum adsorption capacity (qm) was equal to 15.08 mg g-1”
Claim · model-written summary
The presence of Fe tailing positively influenced Raphanus sativus seed germination (73.8%).
- Taxon
- Raphanus sativus
Raphanus sativuse0 - Treatment
- presence of Fe tailinge1
- Outcome
- germination of R. sativus seedse1
- Direction
- positively influencede1
- Value
- 73.8%e1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“verify its effect on Raphanus sativus germination”
e1“The presence of Fe tailing positively influenced the germination of R. sativus seeds (73.8%), but stem and root growth were inferior when compared to seedlings cultivated in compost substrate”
Claim · model-written summary
Stem and root growth of Raphanus sativus seedlings in Fe tailing were inferior to seedlings cultivated in compost substrate.
- Taxon
- Raphanus sativusRaphanus sativuse0
- Treatment
- presence of Fe tailinge1
- Outcome
- stem and root growthe1
- Direction
- inferiore1
- Comparator
- seedlings cultivated in compost substratee1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“verify its effect on Raphanus sativus germination”
e1“The presence of Fe tailing positively influenced the germination of R. sativus seeds (73.8%), but stem and root growth were inferior when compared to seedlings cultivated in compost substrate”
Claim · model-written summary
Low CEC, organic matter and nutrient availability probably explain the minor development of R. sativus in Fe tailing substrate.
- Taxon
- R. sativusRaphanus sativuse1
- Treatment
- Fe tailing substratee1
- Outcome
- developmente1
- Qualifier
- probably due to low CEC, OM and nutrient availabilitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“However, R. sativus development was minor in Fe tailing substrate, probably due to low CEC, OM and nutrient availability”
The same questions in other papers
iron atom · growth · Raphanus sativus (radish)Results agree
3 papers in the same direction as this paper
- positive
- positive
- positive
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.