Effect of humic acid on the bioavailability of radionuclides to rice plants

Ozaki, Takuo; Ambe, S.; Abe, Tomoko; Francis, A.J.

doi:10.1007/s00216-002-1730-z

Cited by 10 publications

(6 citation statements)

References 33 publications

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“…They determined that the humic acid that was adsorbed on the rice root surface attracted Mn and Zn such as that there were increased micro-nutrient amounts readily available for uptake by rice plants. They also discovered that the pH of the culture medium and the addition of humic acid, had an influence of Mn and Zn uptake such that uptake increased at pH 4.3 while uptake decreased at pH 5.3 (Ozaki et al, 2003). This is in agreement with results in this study where the Mn and Zn leaf contents were always lower for the control (no amendment) whose soils had high pH.…”

Section: Leaf Micro Mineral Contentssupporting

confidence: 88%

“…Additionally, Ozaki et al, (2003) conducting experiments with rice to determine how humic acid affects the uptake of radionuclides by rice plants. They determined that the humic acid that was adsorbed on the rice root surface attracted Mn and Zn such as that there were increased micro-nutrient amounts readily available for uptake by rice plants.…”

Section: Leaf Micro Mineral Contentsmentioning

confidence: 99%

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The Influence of Humic Acid Treatment on The Performance and Water Requirements of Plum Trees Planted in Calcareous Soil

2010

Alexandria Science Exchange Journal: An International Quarterly

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Section: Leaf Micro Mineral Contentssupporting

confidence: 88%

Section: Leaf Micro Mineral Contentsmentioning

confidence: 99%

The Influence of Humic Acid Treatment on The Performance and Water Requirements of Plum Trees Planted in Calcareous Soil

2010

Alexandria Science Exchange Journal: An International Quarterly

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“…The large water-filled space observed for the coordination to Eu(III) in chitosan may be responsible for the high affinity of chitosan for bulky ions, such as V(IV)O 2ϩ [34] and [38]. 2ϩ U(VI)O 2 The knowledge of associations between f-trivalent elements and related biopolymers is needed for an accurate estimation of their migration behavior from radioactive wastes, because most of the radioactive wastes contain large quantities of biopolymers, such as cellulosic materials. Our findings indicate that the migration of Am(III) and Cm(III) accidentally leaked from the radioactive waste repository can be delayed by the association with the biopolymers coexisting in the wastes.…”

Section: Discussionmentioning

confidence: 99%

“…Complexation of radionuclides with natural organic ligands can affect their mobility in the environment. Naturally occurring organic acids, such as humic acid and fulvic acid, change the environmental behavior of trivalent f‐elements through complexation [1,2]. Siderophores excreted from microorganisms in response to Fe starvation have high stability for trivalent f‐elements as well as for Fe [3].…”

Section: Introductionmentioning

confidence: 99%

Association of europium(III), americium(III), and curium(III) with cellulose, chitin, and chitosan

Ozaki

Kimura

Ohnuki

et al. 2006

Enviro Toxic and Chemistry

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The association of trivalent f-elements-Eu(III), Am(III), and Cm(III)--with cellulose, chitin, and chitosan was determined by batch experiments and time-resolved, laser-induced fluorescence spectroscopy (TRLFS). The properties of these biopolymers as an adsorbent were characterized based on speciation calculation of Eu(III). The adsorption study showed that an increase of the ionic strength by NaCl did not affect the adsorption kinetics of Eu(III), Am(III), and Cm(III) for all the biopolymers, but the addition of Na2CO3 significantly delayed the kinetics because of their trivalent f-element complexation with carbonate ions. It also was suggested from the speciation calculation study that all the biopolymers were degraded under alkaline conditions, leading to their masking of the adsorption of Eu(III), Am(III), and Cm(III) on the nondegraded biopolymers. The masking effect was higher for cellulose than for chitin and chitosan, indicating that of the three, cellulose was degraded most significantly in alkaline solutions. Desorption experiments suggested that some portion of the adsorbed Eu(III) penetrated deep into the matrix, being isolated in a cavity-like site. The TRLFS study showed that the coordination environment of Eu(III) is stabilized mainly by the inner spherical coordination in chitin and by the outer spherical coordination in chitosan, with less association in cellulose in comparison to chitin and chitosan. These results suggest that the association of these biopolymers with Eu(III), Am(III), and Cm(III) is governed not only by the affinity of the functional groups alone but also by other factors, such as the macromolecular steric effect. The association of degraded materials of the biopolymers also should be taken into consideration for an accurate prediction of the influence of biopolymers on the migration behavior of trivalent f-elements.

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“…1993). Ascorbic acid play an important role not only in scavenging and detoxification of activated oxygen AOS by react super oxide dismutases with super oxide radicals O 2to produce H2O2, ascorbate peroxidase together with monodehydro ascorbate reductase which reduces H2O2 to water (Vaidyanathan et al 2003 andDermial &Turkan 2005), but also in improving growth and developmental processes of rice through improve drought resistance, its content of total phenols in plant which is known as antifungal, antibacterial and antiviral (Ozaki et al (2003), improvment of physiological processes in plant such as ion uptake, cell division, enzymatic activation and protein synthesis and increase lignin biosynthesis and plant cell wall lignifications (Xunzhong and Ervin (2004). Ascorbic acid might be detoxificat the effect of Cl on photo system II and improve the membrane integrity by correct high Na to Co2 ratio (Fadzilla et al,1997, Lin and Kao, 2001and Sakr et al, 2010.…”

Section: -Irrigation Intervals Effectmentioning

confidence: 99%

Influence of Preceding Winter Crops and Irrigation Intervals on Rice Treated With Humic and Ascorbic Acids in North Delta

Ibrahim¹

2011

Journal of Plant Production

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A field experiments were conducted at Tag El-Ezz Agric, Res. Station, Dakahlia governorate Egypt, during the two successive summer seasons of 2005 and 2006 to study the effect of three preceding winter crops (flax, sugar beet and faba bean), three irrigation intervals (every 4, 6 and 8 days) in addition to humic (HA) & ascorbic acids (AA) on growth and yield of rice(sakha 101). The main results could be summarized as follows: Preceding winter crops, irrigation intervals and humic & ascorbic acids had a significant effect on all studied characters in both seasons. Grain yield of rice grown after faba bean attained increase 17.4 and 13% (average of two seasons) compared to rice grown after flax and sugar beet, respectively. Irrigation of rice fields every 6 days recorded the highest values in all studied characters in both seasons expect plant height and straw yield/fad. Irrigation every 6 days increased yield/fad by 4.4 and 21.4% compared to every 4 and 8 day respectively. Application of ascorbic acid gave the highest mean values in all studied characters in both seasons, which attained increase in grain yield reached to 9.3 and 3.8 % compared to control and humic acid, respectively. The highest grain yield (4.87 and 4.97 ton/fad) was recorded by the interaction among cultivation after faba bean, irrigated every 6 days and spraying by ascorbic acid. The relationship between grain yield from one side and its attributing variables on the other side was done using correlation, multiple linear regression and stepwise regression. The simple correlation coefficient cleared significant positive correlation between grain yield t/fad and each of individual studied characters, also cleared that there was significant positive correlation among all characters that were studied and each of other. Multiple regression analysis indicated that the relative contribution for all characters were 91.67 % from the total variation for yield t/fad. Results of stepwise regression analysis revealed that four out of nine variables contributed by 91.55 % in the total variation for yield t/fad. These variables were flag leaf area, 1000-grain weight, filled grains % and number of grains/panicles with R 2 being 89.67, 1.15, 0.40 and 0.73 %, respectively.

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Effect of humic acid on the bioavailability of radionuclides to rice plants

Cited by 10 publications

References 33 publications

The Influence of Humic Acid Treatment on The Performance and Water Requirements of Plum Trees Planted in Calcareous Soil

The Influence of Humic Acid Treatment on The Performance and Water Requirements of Plum Trees Planted in Calcareous Soil

Association of europium(III), americium(III), and curium(III) with cellulose, chitin, and chitosan

Influence of Preceding Winter Crops and Irrigation Intervals on Rice Treated With Humic and Ascorbic Acids in North Delta

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