Papers by LETUZIA OLIVEIRA
Química Nova, 2012
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Gold (Au) mining areas are important from the standpoint of economic development although soils f... more Gold (Au) mining areas are important from the standpoint of economic development although soils from these areas are drastically altered by anthropologic activities. In addition, the Au-carrying rock material usually contains arsenic (As), a toxic and carcinogenic element. Development of novel remediation techniques are required to meet the demands that a burgeoning society place on soil. Phytoremediation, which involves the use of plants to extract contaminants from soil, offers a simple, non-invasive, and cost-effective method to remediate arsenic-contaminated soil compared to traditional clean-up techniques. The aim of this study was to evaluate under greenhouse conditions the effect of As uptake in two species of tropical fern (Thelypteris salzmannii and Dicranopteris flexuosa) in soil from gold mining areas. The soil was collected from a gold mining area in Paracatu (MG), Brazil. The phytoremediation potential of ferns was assessed by the translocation index (TI) and bioaccumul...
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Revista Caatinga
The moringa oleifera Lam. tree, a native plant species from tropical Africa, although it has been... more The moringa oleifera Lam. tree, a native plant species from tropical Africa, although it has been in introduced in Brazil as an ornamental tree, it can be used for industrial and medicine purposes. The work was to evaluate the physiological quality of the jug with different reservoirs and environmental conditions for a period of six months. The study was conducted in the laboratory of plant physiology in UFERSA, where the seeds were obtained, which were stored after the harvest in three different containers: plastic bag, paper bag and glass which were stored at room temperature and cold for a period of three and six months. After 12 days of sowing, evaluations were made of the speed of germination index (IVG), height and fresh and dry matter of seedlings. The experimental design was entirely randomized in a factorial 3 x 2 x 2, and studied three containers (plastic bag, paper bag and glass), two environments (temperature and cold) and two storage periods (3 and 6 months ) with four ...
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Concern about children's exposure to arsenic (As) fromwood treatedwith chromated-copper-arsenate ... more Concern about children's exposure to arsenic (As) fromwood treatedwith chromated-copper-arsenate (CCA) led
to itswithdrawal fromresidential use in 2004. However, due to its effectiveness, millions of American homes still
have CCA-wood decks onwhich children play. This study evaluated the effects of three deck-cleaningmethods on
formation of dislodgeable As and hexavalent chromium (CrVI) on CCA-wood surfaces and in leachate. Initial
wipes from CCA-wood wetted with water showed 3–4 times more dislodgeable As than on dry wood. After
cleaning with a bleach solution, 9.8–40.3 μg/100 cm2 of CrVI was found on the wood surface, with up to
170 μg/L CrVI in the leachate. Depending on the cleaning method, 699–2473 mg of As would be released into
the environment from cleaning a 18.6-m2-deck. Estimated As doses in children aged 1–6 after 1 h of playing
on a wet CCA-wood deck were 0.25–0.41 μg/kg. This is the first study to identify increased dislodgeable As on
wet CCA-wood and to evaluate dislodgeable CrVI after bleach application. Our data suggest that As and CrVI in
25-year old CCA-wood still show exposure risks for children and potential for soil contamination.
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Química Nova, 2012
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Environmental Science & Technology, 2011
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We investigated the effects of chromate (CrVI) and phosphate (P) on their uptake and translocatio... more We investigated the effects of chromate (CrVI) and phosphate (P) on their uptake and translocation in Ashyperaccumulator
Pteris vittata (PV). Plants were exposed to 1) 0.10 mM CrVI and 0, 0.25, 1.25, or
2.50 mM P or 2) 0.25 mM P and 0, 0.50, 2.5 or 5.0 mM CrVI for 24 h in hydroponics. PV accumulated
2919 mg/kg Cr in the roots at CrVI0.10, and 5100 and 3500 mg/kg P in the fronds and roots at P0.25. When
co-present, CrVI and P inhibited each other's uptake in PV. Increasing P concentrations reduced Cr root
concentrations by 62e82% whereas increasing CrVI concentrations reduced frond P concentrations by 52
e59% but increased root P concentrations by 11e15%. Chromate reduced P transport, with more P being
accumulated in PV roots. Though CrVI was supplied, 6478% and 9293% CrIII were in PV fronds and
roots. Based on X-ray diffraction, Cr2O3 was detected in the roots confirming CrVI reduction to CrIII by PV.
In short, CrVI and P inhibited each other in uptake and translocation by PV, and CrVI reduction to CrIII in
PV roots served as its detoxification mechanism. The finding helps to understand the interactions of P
and Cr during their uptake in PV.
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Even though antimony (Sb) and arsenic (As) are chemical analogs, differences exist on how they ar... more Even though antimony (Sb) and arsenic (As) are chemical analogs, differences exist on how they are taken up and translocated in plants. We investigated 1) Sb uptake, efflux and speciation in arsenic
hyperaccumulator Pteris vittata after 1 d exposure to 1.6 or 8 mg/L antimonite (SbIII) or antimonate (SbV), 2) Sb uptake by PV accessions from Florida, China, and Brazil after 7 d exposure to 8 mg/L SbIII, and 3) Sb uptake and oxidation by excised PV fronds after 1 d exposure to 8 mg/L SbIII or SbV. After 1 d
exposure, P. vittata took 23e32 times more SbIII than SbV, with all Sb being accumulated in the roots with the highest at 4,192 mg/kg. When exposed to 8 mg/L SbV, 98% of Sb existed as SbV in the roots. In comparison, when exposed to 8 mg/L SbIII, 81% of the total Sb remained as SbIII and 26% of the total Sb
was effluxed out into the media. The three PV accessions had a similar ability to accumulate Sb at12,000 mg/kg in the roots, with >99% of total Sb in the roots. Excised PV fronds translocated SbV more efficiently from the petioles to pinnae than SbIII and were unable to oxidize SbIII. Overall, P. vittata
displayed efficient root uptake and efflux of SbIII with limited ability to translocate and transform in the roots.
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ABSTRACT: Negative impacts caused by arsenic (As) in soils and waters have attracted public inter... more ABSTRACT: Negative impacts caused by arsenic (As) in soils and waters have attracted public interest due to contamination of ecosystems and human populations dwelling in the vicinity of its generating sources. The main anthropogenic sources of such contamination result from the oxidation of sulfide residues containing arsenopyrite in piles of mining
tailings and the leaching of soils with high background of As. This contamination presents serious consequences to the functional components of ecosystems. Through plant uptake, this element can enter the food chain and cause several health problems, even at low exposure
(<10 mgL–1). Therefore, to reduce the environmental impacts caused by contamination of soil, watercourses, and groundwater, the use of phytotechnologies applicable to the remediation of contaminated environments have been highlighted. The objective was to describe the current
state of research on As, focusing on plant behavior and risks to health and the environment. Phytoremediation is a promising technique to recover local sites contaminated by trace elements such as As.Unfortunately, few plant species have presented phytoremediation potential so far. In the relation between soil-plant-behavior of As and human health risk, studies should be directed to the discovery of species with remediation potential and to
analysis on the interactions of As with Pb, Zn and Cd, naturally associated with secondary
minerals. To this end, the mineralogy and stability of these minerals should be studied via X-ray diffraction and X-ray absorption spectroscopy, combined with bioaccessibility analyses.
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Papers by LETUZIA OLIVEIRA
to itswithdrawal fromresidential use in 2004. However, due to its effectiveness, millions of American homes still
have CCA-wood decks onwhich children play. This study evaluated the effects of three deck-cleaningmethods on
formation of dislodgeable As and hexavalent chromium (CrVI) on CCA-wood surfaces and in leachate. Initial
wipes from CCA-wood wetted with water showed 3–4 times more dislodgeable As than on dry wood. After
cleaning with a bleach solution, 9.8–40.3 μg/100 cm2 of CrVI was found on the wood surface, with up to
170 μg/L CrVI in the leachate. Depending on the cleaning method, 699–2473 mg of As would be released into
the environment from cleaning a 18.6-m2-deck. Estimated As doses in children aged 1–6 after 1 h of playing
on a wet CCA-wood deck were 0.25–0.41 μg/kg. This is the first study to identify increased dislodgeable As on
wet CCA-wood and to evaluate dislodgeable CrVI after bleach application. Our data suggest that As and CrVI in
25-year old CCA-wood still show exposure risks for children and potential for soil contamination.
Pteris vittata (PV). Plants were exposed to 1) 0.10 mM CrVI and 0, 0.25, 1.25, or
2.50 mM P or 2) 0.25 mM P and 0, 0.50, 2.5 or 5.0 mM CrVI for 24 h in hydroponics. PV accumulated
2919 mg/kg Cr in the roots at CrVI0.10, and 5100 and 3500 mg/kg P in the fronds and roots at P0.25. When
co-present, CrVI and P inhibited each other's uptake in PV. Increasing P concentrations reduced Cr root
concentrations by 62e82% whereas increasing CrVI concentrations reduced frond P concentrations by 52
e59% but increased root P concentrations by 11e15%. Chromate reduced P transport, with more P being
accumulated in PV roots. Though CrVI was supplied, 6478% and 9293% CrIII were in PV fronds and
roots. Based on X-ray diffraction, Cr2O3 was detected in the roots confirming CrVI reduction to CrIII by PV.
In short, CrVI and P inhibited each other in uptake and translocation by PV, and CrVI reduction to CrIII in
PV roots served as its detoxification mechanism. The finding helps to understand the interactions of P
and Cr during their uptake in PV.
hyperaccumulator Pteris vittata after 1 d exposure to 1.6 or 8 mg/L antimonite (SbIII) or antimonate (SbV), 2) Sb uptake by PV accessions from Florida, China, and Brazil after 7 d exposure to 8 mg/L SbIII, and 3) Sb uptake and oxidation by excised PV fronds after 1 d exposure to 8 mg/L SbIII or SbV. After 1 d
exposure, P. vittata took 23e32 times more SbIII than SbV, with all Sb being accumulated in the roots with the highest at 4,192 mg/kg. When exposed to 8 mg/L SbV, 98% of Sb existed as SbV in the roots. In comparison, when exposed to 8 mg/L SbIII, 81% of the total Sb remained as SbIII and 26% of the total Sb
was effluxed out into the media. The three PV accessions had a similar ability to accumulate Sb at12,000 mg/kg in the roots, with >99% of total Sb in the roots. Excised PV fronds translocated SbV more efficiently from the petioles to pinnae than SbIII and were unable to oxidize SbIII. Overall, P. vittata
displayed efficient root uptake and efflux of SbIII with limited ability to translocate and transform in the roots.
tailings and the leaching of soils with high background of As. This contamination presents serious consequences to the functional components of ecosystems. Through plant uptake, this element can enter the food chain and cause several health problems, even at low exposure
(<10 mgL–1). Therefore, to reduce the environmental impacts caused by contamination of soil, watercourses, and groundwater, the use of phytotechnologies applicable to the remediation of contaminated environments have been highlighted. The objective was to describe the current
state of research on As, focusing on plant behavior and risks to health and the environment. Phytoremediation is a promising technique to recover local sites contaminated by trace elements such as As.Unfortunately, few plant species have presented phytoremediation potential so far. In the relation between soil-plant-behavior of As and human health risk, studies should be directed to the discovery of species with remediation potential and to
analysis on the interactions of As with Pb, Zn and Cd, naturally associated with secondary
minerals. To this end, the mineralogy and stability of these minerals should be studied via X-ray diffraction and X-ray absorption spectroscopy, combined with bioaccessibility analyses.
to itswithdrawal fromresidential use in 2004. However, due to its effectiveness, millions of American homes still
have CCA-wood decks onwhich children play. This study evaluated the effects of three deck-cleaningmethods on
formation of dislodgeable As and hexavalent chromium (CrVI) on CCA-wood surfaces and in leachate. Initial
wipes from CCA-wood wetted with water showed 3–4 times more dislodgeable As than on dry wood. After
cleaning with a bleach solution, 9.8–40.3 μg/100 cm2 of CrVI was found on the wood surface, with up to
170 μg/L CrVI in the leachate. Depending on the cleaning method, 699–2473 mg of As would be released into
the environment from cleaning a 18.6-m2-deck. Estimated As doses in children aged 1–6 after 1 h of playing
on a wet CCA-wood deck were 0.25–0.41 μg/kg. This is the first study to identify increased dislodgeable As on
wet CCA-wood and to evaluate dislodgeable CrVI after bleach application. Our data suggest that As and CrVI in
25-year old CCA-wood still show exposure risks for children and potential for soil contamination.
Pteris vittata (PV). Plants were exposed to 1) 0.10 mM CrVI and 0, 0.25, 1.25, or
2.50 mM P or 2) 0.25 mM P and 0, 0.50, 2.5 or 5.0 mM CrVI for 24 h in hydroponics. PV accumulated
2919 mg/kg Cr in the roots at CrVI0.10, and 5100 and 3500 mg/kg P in the fronds and roots at P0.25. When
co-present, CrVI and P inhibited each other's uptake in PV. Increasing P concentrations reduced Cr root
concentrations by 62e82% whereas increasing CrVI concentrations reduced frond P concentrations by 52
e59% but increased root P concentrations by 11e15%. Chromate reduced P transport, with more P being
accumulated in PV roots. Though CrVI was supplied, 6478% and 9293% CrIII were in PV fronds and
roots. Based on X-ray diffraction, Cr2O3 was detected in the roots confirming CrVI reduction to CrIII by PV.
In short, CrVI and P inhibited each other in uptake and translocation by PV, and CrVI reduction to CrIII in
PV roots served as its detoxification mechanism. The finding helps to understand the interactions of P
and Cr during their uptake in PV.
hyperaccumulator Pteris vittata after 1 d exposure to 1.6 or 8 mg/L antimonite (SbIII) or antimonate (SbV), 2) Sb uptake by PV accessions from Florida, China, and Brazil after 7 d exposure to 8 mg/L SbIII, and 3) Sb uptake and oxidation by excised PV fronds after 1 d exposure to 8 mg/L SbIII or SbV. After 1 d
exposure, P. vittata took 23e32 times more SbIII than SbV, with all Sb being accumulated in the roots with the highest at 4,192 mg/kg. When exposed to 8 mg/L SbV, 98% of Sb existed as SbV in the roots. In comparison, when exposed to 8 mg/L SbIII, 81% of the total Sb remained as SbIII and 26% of the total Sb
was effluxed out into the media. The three PV accessions had a similar ability to accumulate Sb at12,000 mg/kg in the roots, with >99% of total Sb in the roots. Excised PV fronds translocated SbV more efficiently from the petioles to pinnae than SbIII and were unable to oxidize SbIII. Overall, P. vittata
displayed efficient root uptake and efflux of SbIII with limited ability to translocate and transform in the roots.
tailings and the leaching of soils with high background of As. This contamination presents serious consequences to the functional components of ecosystems. Through plant uptake, this element can enter the food chain and cause several health problems, even at low exposure
(<10 mgL–1). Therefore, to reduce the environmental impacts caused by contamination of soil, watercourses, and groundwater, the use of phytotechnologies applicable to the remediation of contaminated environments have been highlighted. The objective was to describe the current
state of research on As, focusing on plant behavior and risks to health and the environment. Phytoremediation is a promising technique to recover local sites contaminated by trace elements such as As.Unfortunately, few plant species have presented phytoremediation potential so far. In the relation between soil-plant-behavior of As and human health risk, studies should be directed to the discovery of species with remediation potential and to
analysis on the interactions of As with Pb, Zn and Cd, naturally associated with secondary
minerals. To this end, the mineralogy and stability of these minerals should be studied via X-ray diffraction and X-ray absorption spectroscopy, combined with bioaccessibility analyses.