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Lena Q - One of the best experts on this subject based on the ideXlab platform.

  • arsenic hyperaccumulator pteris vittata efficiently solubilized Phosphate Rock to sustain plant growth and as uptake
    Journal of Hazardous Materials, 2017
    Co-Authors: Jing Wei Fu, Yanshan Chen, Lena Q, Letuzia M De Oliveira, Bala Rathinasabapathi
    Abstract:

    Abstract Phosphorus (P) is one of the most important nutrients for phytoremediation of arsenic (As)-contaminated soils. In this study, we demonstrated that As-hyperaccumulator Pteris vittata was efficient in acquiring P from insoluble Phosphate Rock (PR). When supplemented with PR as the sole P source in hydroponic systems, P. vittata accumulated 49% and 28% higher P in the roots and fronds than the −P treatment. In contrast, non-hyperaccumulator Pteris ensiformis was unable to solubilize P from PR. To gain insights into PR solubilization by plants, organic acids in plant root exudates were analyzed by HPLC. The results showed that phytic acid was the predominant (>90%) organic acid in P. vittata root exudates whereas only oxalic acid was detected in P. ensiformis. Moreover, P. vittata secreted more phytic acid in −P and PR treatments. Compared to oxalic acid, phytic acid was more effective in solubilizing PR, suggesting that phytic acid was critical for PR utilization. Besides, secretion of phytic acid by P. vittata was not inhibited by arsenate. Our data indicated that phytic acid played an important role in efficient use of insoluble PR by P. vittata, shedding light on using insoluble PR to enhance phytoremediation of As-contaminated soils.

  • arsenic induced plant growth of arsenic hyperaccumulator pteris vittata impact of arsenic and Phosphate Rock
    Chemosphere, 2016
    Co-Authors: Guang Mei Yang, Jing Wei Fu, Dong Xing Guan, Yanshan Chen, Lena Q
    Abstract:

    Abstract Phosphate Rock (PR) has been shown to promote plant growth and arsenic (As) uptake by As-hyperaccumulator Pteris vittata (PV). However, little is known about its behaviors in agricultural soils. In this study, impact of 50 mg kg −1 As and/or 1.5% PR amendment on plant As accumulation and growth was investigated by growing PV for 90 d in three agricultural soils. While As amendment significantly increased plant As uptake and substantially promoted PV growth, the opposite was observed with PR amendment. Arsenic amendment increased plant frond As from 16.9–265 to 961–6017 mg kg −1 ,whereas PR amendment lowered frond As to 10.2–216 mg kg −1 . The As-induced plant growth stimulation was 69–71%. While PR amendment increased plant Ca and P uptake, As amendment showed opposite results. The PV biomass was highly correlated with plant As at r  = 0.82, but with weak correlations with plant Ca or P at r

  • sparingly soluble Phosphate Rock induced significant plant growth and arsenic uptake by pteris vittata from three contaminated soils
    Environmental Science & Technology, 2013
    Co-Authors: Jason T Lessl, Lena Q
    Abstract:

    We evaluated the ability of As-hyperaccumulator Pteris vittata (PV) to remove As from As-contaminated soils over five harvests in 2.5 years in raised beds (162 kg soil/bed). We tested the hypothesis that a P-limiting environment would enhance PV growth and As uptake owing its unique ability to uptake P under As-rich environment. In Dec. 2009, PV was transplanted to three As-contaminated soils (pH of 5.5–7.2) containing 25–129 mg kg–1 As, which was amended with sparingly-soluble Phosphate Rock (PR-soil) or soluble P fertilizer (P-soil). During the 2.5-year, PV obtained sufficient P (1882 vs 2225 mg kg–1) from PR-soils, with increased root biomass (33%) and root exudation (53%) compared to P-soils. In addition, its frond biomass increased by 20% consecutively with each harvest (six month interval) from 18 to 36 g plant–1. Its frond biomass in PR-soils (52.2 g plant–1 year–1 or ∼12 mt ha–1 year–1) averaged 39% more than that in P-soils. To our knowledge, this represented the largest PV frond biomass reported...

  • immobilization of zn cu and pb in contaminated soils using Phosphate Rock and phosphoric acid
    Journal of Hazardous Materials, 2009
    Co-Authors: Lena Q, Xinde Cao, Ammar Wahbi, Yongliang Yang
    Abstract:

    Considerable research has been done on P-induced Pb immobilization in Pb-contaminated soils. However, application of P to soils contaminated with multiple heavy metals is limited. The present study examined effectiveness of phosphoric acid (PA) and/or Phosphate Rock (PR) in immobilizing Pb, Cu, and Zn in two contaminated soils. The effectiveness was evaluated using water extraction, plant uptake, and a simple bioaccessibility extraction test (SBET) mimicking metal uptake in the acidic environment of human stomach. The possible mechanisms for metal immobilization were elucidated using X-ray diffraction, scanning electron microscopy, and chemical speciation program Visual MINTEQ. Compared to the control, all P amendments significantly reduced Pb water solubility, phytoavailability, and bioaccessibility by 72–100%, 15–86%, and 28–92%, respectively. The Pb immobilization was probably attributed to the formation of insoluble Pb Phosphate minerals. Phosphorus significantly reduced Cu and Zn water solubility by 31–80% and 40–69%, respectively, presumably due to their sorption on minerals (e.g., calcite and Phosphate phases) following CaO addition. However, P had little effect on the Cu and Zn phytoavailability; while the acid extractability of Cu and Zn induced by SBET (pH 2) were even elevated by up to 48% and 40%, respectively, in the H3PO4 treatments (PA and PR + PA). Our results indicate that Phosphate was effective in reducing Pb availability in terms of water solubility, bioaccessibility, and phytoavailability. Caution should be exercised when H3PO4 was amended to the soil co-contaminated with Cu and Zn since the acidic condition of SBET increased Cu and Zn bioaccessibility though their water solubility was reduced.

  • using Phosphate Rock to immobilize metals in soil and increase arsenic uptake by hyperaccumulator pteris vittata
    Science of The Total Environment, 2006
    Co-Authors: Abioye O Fayiga, Lena Q
    Abstract:

    This greenhouse experiment evaluated the effects of Phosphate Rock (PR) on arsenic and metal uptake by the arsenic hyperaccumulator Pteris vittata in a soil spiked with arsenic and heavy metals Cd, Pb and Zn. Five soil treatments were used, 1) control with no arsenic, 2) spiked with 50 mg kg 1 As (As) as Na2H AsO4, 3) spiked with 50 mg kg 1 As and P as PR (AsP), 4) spiked with 50 mg kg 1 As, Pb, Cd, and Zn (AsM), and 5) spiked with 50 mg kg 1 As, Pb, Cd, Zn and P (AsMP). The plants were harvested after growing in the soil for five weeks. Compared to the As treatment, the presence of heavy metals (AsM) reduced arsenic concentrations in the fronds from 1631 to 608 mg kg 1 . However, this effect was mitigated by PR (AsMP), with arsenic concentrations in the fronds increased from 608 to 1046 mg kg 1 . Phosphate Rock also significantly reduced Pb (13.5 to 4.10 mg kg 1 ) and Cd (13.0 to 3.45 mg kg 1 ) concentrations in the fronds. Most of the arsenic in P. vittata was accumulated in the fronds (89–93%). Compared to the control, P was more concentrated in the roots along with less P being translocated to the fronds in the treatments with arsenic. While in those same treatments higher Ca concentrations in both the fronds and roots were observed. This research shows that PR was effective in increasing arsenic uptake and decreasing metal uptake by P. vittata and thus can be used as a cost-effective amendment for phytoremediation of arsenic and metal polluted soils. D 2005 Elsevier B.V. All rights reserved.

Jing Wei Fu - One of the best experts on this subject based on the ideXlab platform.

  • arsenic hyperaccumulator pteris vittata efficiently solubilized Phosphate Rock to sustain plant growth and as uptake
    Journal of Hazardous Materials, 2017
    Co-Authors: Jing Wei Fu, Yanshan Chen, Lena Q, Letuzia M De Oliveira, Bala Rathinasabapathi
    Abstract:

    Abstract Phosphorus (P) is one of the most important nutrients for phytoremediation of arsenic (As)-contaminated soils. In this study, we demonstrated that As-hyperaccumulator Pteris vittata was efficient in acquiring P from insoluble Phosphate Rock (PR). When supplemented with PR as the sole P source in hydroponic systems, P. vittata accumulated 49% and 28% higher P in the roots and fronds than the −P treatment. In contrast, non-hyperaccumulator Pteris ensiformis was unable to solubilize P from PR. To gain insights into PR solubilization by plants, organic acids in plant root exudates were analyzed by HPLC. The results showed that phytic acid was the predominant (>90%) organic acid in P. vittata root exudates whereas only oxalic acid was detected in P. ensiformis. Moreover, P. vittata secreted more phytic acid in −P and PR treatments. Compared to oxalic acid, phytic acid was more effective in solubilizing PR, suggesting that phytic acid was critical for PR utilization. Besides, secretion of phytic acid by P. vittata was not inhibited by arsenate. Our data indicated that phytic acid played an important role in efficient use of insoluble PR by P. vittata, shedding light on using insoluble PR to enhance phytoremediation of As-contaminated soils.

  • arsenic induced plant growth of arsenic hyperaccumulator pteris vittata impact of arsenic and Phosphate Rock
    Chemosphere, 2016
    Co-Authors: Guang Mei Yang, Jing Wei Fu, Dong Xing Guan, Yanshan Chen, Lena Q
    Abstract:

    Abstract Phosphate Rock (PR) has been shown to promote plant growth and arsenic (As) uptake by As-hyperaccumulator Pteris vittata (PV). However, little is known about its behaviors in agricultural soils. In this study, impact of 50 mg kg −1 As and/or 1.5% PR amendment on plant As accumulation and growth was investigated by growing PV for 90 d in three agricultural soils. While As amendment significantly increased plant As uptake and substantially promoted PV growth, the opposite was observed with PR amendment. Arsenic amendment increased plant frond As from 16.9–265 to 961–6017 mg kg −1 ,whereas PR amendment lowered frond As to 10.2–216 mg kg −1 . The As-induced plant growth stimulation was 69–71%. While PR amendment increased plant Ca and P uptake, As amendment showed opposite results. The PV biomass was highly correlated with plant As at r  = 0.82, but with weak correlations with plant Ca or P at r

  • Arsenic-induced plant growth of arsenic-hyperaccumulator Pteris vittata: Impact of arsenic and Phosphate Rock
    Chemosphere, 2016
    Co-Authors: Yong He Han, Guang Mei Yang, Jing Wei Fu, Dong Xing Guan, Yanshan Chen, Lena Q. Ma
    Abstract:

    Phosphate Rock (PR) has been shown to promote plant growth and arsenic (As) uptake by As-hyperaccumulator Pteris vittata (PV). However, little is known about its behaviors in agricultural soils. In this study, impact of 50 mg kg-1 As and/or 1.5% PR amendment on plant As accumulation and growth was investigated by growing PV for 90 d in three agricultural soils. While As amendment significantly increased plant As uptake and substantially promoted PV growth, the opposite was observed with PR amendment. Arsenic amendment increased plant frond As from 16.9-265 to 961-6017 mg kg-1,whereas PR amendment lowered frond As to 10.2-216 mg kg-1. The As-induced plant growth stimulation was 69-71%. While PR amendment increased plant Ca and P uptake, As amendment showed opposite results. The PV biomass was highly correlated with plant As at r = 0.82, but with weak correlations with plant Ca or P at r < 0.30. This study confirmed that 1) As significantly promoted PV growth, probably independent of Ca or P uptake, 2) PR amendment didn't enhance plant growth or As uptake by PV in agricultural soils with adequate available P, and 3) PV effluxed arsenite (AsIII) growing in agricultural soils.

Yanshan Chen - One of the best experts on this subject based on the ideXlab platform.

  • arsenic hyperaccumulator pteris vittata efficiently solubilized Phosphate Rock to sustain plant growth and as uptake
    Journal of Hazardous Materials, 2017
    Co-Authors: Jing Wei Fu, Yanshan Chen, Lena Q, Letuzia M De Oliveira, Bala Rathinasabapathi
    Abstract:

    Abstract Phosphorus (P) is one of the most important nutrients for phytoremediation of arsenic (As)-contaminated soils. In this study, we demonstrated that As-hyperaccumulator Pteris vittata was efficient in acquiring P from insoluble Phosphate Rock (PR). When supplemented with PR as the sole P source in hydroponic systems, P. vittata accumulated 49% and 28% higher P in the roots and fronds than the −P treatment. In contrast, non-hyperaccumulator Pteris ensiformis was unable to solubilize P from PR. To gain insights into PR solubilization by plants, organic acids in plant root exudates were analyzed by HPLC. The results showed that phytic acid was the predominant (>90%) organic acid in P. vittata root exudates whereas only oxalic acid was detected in P. ensiformis. Moreover, P. vittata secreted more phytic acid in −P and PR treatments. Compared to oxalic acid, phytic acid was more effective in solubilizing PR, suggesting that phytic acid was critical for PR utilization. Besides, secretion of phytic acid by P. vittata was not inhibited by arsenate. Our data indicated that phytic acid played an important role in efficient use of insoluble PR by P. vittata, shedding light on using insoluble PR to enhance phytoremediation of As-contaminated soils.

  • arsenic induced plant growth of arsenic hyperaccumulator pteris vittata impact of arsenic and Phosphate Rock
    Chemosphere, 2016
    Co-Authors: Guang Mei Yang, Jing Wei Fu, Dong Xing Guan, Yanshan Chen, Lena Q
    Abstract:

    Abstract Phosphate Rock (PR) has been shown to promote plant growth and arsenic (As) uptake by As-hyperaccumulator Pteris vittata (PV). However, little is known about its behaviors in agricultural soils. In this study, impact of 50 mg kg −1 As and/or 1.5% PR amendment on plant As accumulation and growth was investigated by growing PV for 90 d in three agricultural soils. While As amendment significantly increased plant As uptake and substantially promoted PV growth, the opposite was observed with PR amendment. Arsenic amendment increased plant frond As from 16.9–265 to 961–6017 mg kg −1 ,whereas PR amendment lowered frond As to 10.2–216 mg kg −1 . The As-induced plant growth stimulation was 69–71%. While PR amendment increased plant Ca and P uptake, As amendment showed opposite results. The PV biomass was highly correlated with plant As at r  = 0.82, but with weak correlations with plant Ca or P at r

  • Arsenic-induced plant growth of arsenic-hyperaccumulator Pteris vittata: Impact of arsenic and Phosphate Rock
    Chemosphere, 2016
    Co-Authors: Yong He Han, Guang Mei Yang, Jing Wei Fu, Dong Xing Guan, Yanshan Chen, Lena Q. Ma
    Abstract:

    Phosphate Rock (PR) has been shown to promote plant growth and arsenic (As) uptake by As-hyperaccumulator Pteris vittata (PV). However, little is known about its behaviors in agricultural soils. In this study, impact of 50 mg kg-1 As and/or 1.5% PR amendment on plant As accumulation and growth was investigated by growing PV for 90 d in three agricultural soils. While As amendment significantly increased plant As uptake and substantially promoted PV growth, the opposite was observed with PR amendment. Arsenic amendment increased plant frond As from 16.9-265 to 961-6017 mg kg-1,whereas PR amendment lowered frond As to 10.2-216 mg kg-1. The As-induced plant growth stimulation was 69-71%. While PR amendment increased plant Ca and P uptake, As amendment showed opposite results. The PV biomass was highly correlated with plant As at r = 0.82, but with weak correlations with plant Ca or P at r < 0.30. This study confirmed that 1) As significantly promoted PV growth, probably independent of Ca or P uptake, 2) PR amendment didn't enhance plant growth or As uptake by PV in agricultural soils with adequate available P, and 3) PV effluxed arsenite (AsIII) growing in agricultural soils.

Guang Mei Yang - One of the best experts on this subject based on the ideXlab platform.

  • arsenic induced plant growth of arsenic hyperaccumulator pteris vittata impact of arsenic and Phosphate Rock
    Chemosphere, 2016
    Co-Authors: Guang Mei Yang, Jing Wei Fu, Dong Xing Guan, Yanshan Chen, Lena Q
    Abstract:

    Abstract Phosphate Rock (PR) has been shown to promote plant growth and arsenic (As) uptake by As-hyperaccumulator Pteris vittata (PV). However, little is known about its behaviors in agricultural soils. In this study, impact of 50 mg kg −1 As and/or 1.5% PR amendment on plant As accumulation and growth was investigated by growing PV for 90 d in three agricultural soils. While As amendment significantly increased plant As uptake and substantially promoted PV growth, the opposite was observed with PR amendment. Arsenic amendment increased plant frond As from 16.9–265 to 961–6017 mg kg −1 ,whereas PR amendment lowered frond As to 10.2–216 mg kg −1 . The As-induced plant growth stimulation was 69–71%. While PR amendment increased plant Ca and P uptake, As amendment showed opposite results. The PV biomass was highly correlated with plant As at r  = 0.82, but with weak correlations with plant Ca or P at r

  • Arsenic-induced plant growth of arsenic-hyperaccumulator Pteris vittata: Impact of arsenic and Phosphate Rock
    Chemosphere, 2016
    Co-Authors: Yong He Han, Guang Mei Yang, Jing Wei Fu, Dong Xing Guan, Yanshan Chen, Lena Q. Ma
    Abstract:

    Phosphate Rock (PR) has been shown to promote plant growth and arsenic (As) uptake by As-hyperaccumulator Pteris vittata (PV). However, little is known about its behaviors in agricultural soils. In this study, impact of 50 mg kg-1 As and/or 1.5% PR amendment on plant As accumulation and growth was investigated by growing PV for 90 d in three agricultural soils. While As amendment significantly increased plant As uptake and substantially promoted PV growth, the opposite was observed with PR amendment. Arsenic amendment increased plant frond As from 16.9-265 to 961-6017 mg kg-1,whereas PR amendment lowered frond As to 10.2-216 mg kg-1. The As-induced plant growth stimulation was 69-71%. While PR amendment increased plant Ca and P uptake, As amendment showed opposite results. The PV biomass was highly correlated with plant As at r = 0.82, but with weak correlations with plant Ca or P at r < 0.30. This study confirmed that 1) As significantly promoted PV growth, probably independent of Ca or P uptake, 2) PR amendment didn't enhance plant growth or As uptake by PV in agricultural soils with adequate available P, and 3) PV effluxed arsenite (AsIII) growing in agricultural soils.

Candan Hamamci - One of the best experts on this subject based on the ideXlab platform.

  • hazardous metal geochemistry of sedimentary Phosphate Rock used for fertilizer mazidag se anatolia turkey
    Microchemical Journal, 2010
    Co-Authors: Isil Aydin, Firat Aydin, Gulhan E Bakirdere, Abdurrahman Saydut, Candan Hamamci
    Abstract:

    Composition of Phosphate Rocks mostly depend on their type and origin. Sedimentary Rocks contain high concentration of heavy metals. Phosphate Rocks are mainly used for the manufacturing of Phosphate fertilizers. The contents of heavy metals Cd, Co, Cu, Fe, Mn, Ni, Pb and Zn, as well as rare earth elements Ce, La, and Th were determined in sedimentary Phosphate Rock used for production of fertilizer in Turkey. The Kasrik-Semikan, Mazidag (Mardin, SE Anatolia, Turkey) high-grade Phosphate Rock used in this study is situated near the border with Syria and was deposited during the Turonian and Senonian (Cretaceous) ages. Total phosphorus (P) concentration in the Rock is 18.5% on the average. Microwave acid digestion (MW-AD) followed by Inductively Coupled Plasma-Optical Emission Spectrophotometry (ICP-OES) was carried out for the determination of all the elements of interest in Phosphate Rock. The results revealed that hazardous metal content of the Phosphate Rock was lower in Mazidag Phosphate than that in samples imported from other countries and were within the safety limits.

  • determination of mineral Phosphate species in sedimentary Phosphate Rock in mardin se anatolia turkey by sequential extraction
    Microchemical Journal, 2009
    Co-Authors: Isil Aydin, Firat Aydin, Sefik Imamoglu, Abdurrahman Saydut, Candan Hamamci
    Abstract:

    Abstract The importance of the effect of Phosphate Rock depends on the chemical form of phosphorus in which this element is combined. The paper presents the results of inorganic and organic forms of phosphorus in the Phosphate Rock from Mazidag-Derik, Semikan deposit located at Mardin city at SE Anatolia of Turkey. Total phosphorus concentration in the Rock is an average 18.5%. The inorganic phosphorus mean % contents were 99.98% for studied sedimentary Phosphate Rock. Speciation of inorganic phosphorus was carried out using a method based on sequential extractions of the sedimentary Phosphate Rock each releasing four forms of inorganic phosphorus: loosely sorbed phosphorus, phosphorus bound to aluminium (P–Al), phosphorus bound to calcium (P–Ca) and phosphorus bound to iron (P–Fe). Calcium bound phosphorus is the dominant form of inorganic phosphorus in the studied sedimentary Phosphate Rock. Aluminium bound phosphorus is the second, iron bound phosphorus is the third most prevailing form. Loosely bound phosphorus is present in the lowest amounts. Analyses of phosphorus forms in sedimentary Phosphate Rock using a UV spectrophotometric method and ICP-AES are reported here. For the phosphorus the two methods give the same results and the concentrations are in good agreement with the reference values.