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1. Adsorption of thallium(I) onto minerals and geological materials: Influence of pH and humic acid | |||
LIU Juan,LIPPOLD Holger,WANG Jin,LIPPMANN-PIPKE Johanna,CHEN Yongheng | |||
Environmental Science and Techology 15 September 2010 | |||
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Abstract:In this paper, the adsorption of the severely toxic heavy metal thallium (Tl) as a monovalent cation onto three representative materials (goethite, pyrolusite and a natural sediment sampled from a field site) was examined as a function of pH in the absence and presence of two natural humic acids (HAs) , using 204Tl(I) as a radiotracer. In order to obtain a basic understanding of the relative trends of the pH functions in the adsorption of Tl(I) with and without HA, adsorption of HAs and humate complexation of Tl(I) as a function of pH were investigated as well. In spite of the low complexation between Tl(I) and HAs, the presence of HAs results in obvious alterations of Tl(I) adsorption onto pyrolusite and sediment. An influence on Tl(I) adsorption onto goethite was not observed. Predictions of Kd (distribution coefficient) for Tl(I) on goethite in the presence of HAs based on a linear additive model agree well with the experimental data, while a notable disagreement occurs for the pyrolusite and sediment systems. Accordingly, it is suggested that HAs and goethite may act as a non-interacting adsorbent mixture under the conditions here, but more complex interactive effects may take place between the HAs and mineral phases of pyrolusite or sediment. | |||
TO cite this article:LIU Juan,LIPPOLD Holger,WANG Jin, et al. Adsorption of thallium(I) onto minerals and geological materials: Influence of pH and humic acid[OL].[15 September 2010] http://en.paper.edu.cn/en_releasepaper/content/4385379 |
2. Root-Water/Nitrogen-Uptake and Root Nitrogen Mass of Winter Wheat under Optimal Water Condition | |||
Shi Jianchu ,Zuo Qiang | |||
Environmental Science and Techology 17 December 2007 | |||
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Abstract:Root water and nitrogen uptake are key processes for plant growth and soil water and nitrogen transport in the soil-plant system. Enormous effort has been made to set up the rational root-water-uptake (RWU) and root-nitrogen-uptake (RNU) models on the basis of root length to simulate soil water and nitrogen dynamics. However, the diversities of root uptake activity among different roots or different parts of a root, and the effect of soil nitrogen level on RWU were ignored. In this study, two greenhouse experiments with winter wheat seedlings cultured in nutrient solution (Exp. 1) and sand soil columns (Exp. 2) were conducted to investigate the relationship between root water/nitrogen uptake activity and root length, root nitrogen mass (RNM) of winter wheat under optimal water condition. Results showed that the potential RWU and RNU coefficients (per unit root length) changed sensitively with root age and soil nitrogen level. Nevertheless, when RNM was taken into consideration, RWU and RNU were found to be linearly correlated with RNM, and the potential RWU coefficient per unit RNM was almost a constant for both the whole root zone and different soil layers, independent of root age and soil nitrogen level but dependent linearly on the free water surface evaporation rate. The interrelations between RWU, RNU and RNM of winter wheat under optimal water condition would be helpful to set up rational RWU and RNU models for simulating soil water and nitrogen movement in the soil-wheat system. | |||
TO cite this article:Shi Jianchu ,Zuo Qiang . Root-Water/Nitrogen-Uptake and Root Nitrogen Mass of Winter Wheat under Optimal Water Condition[OL].[17 December 2007] http://en.paper.edu.cn/en_releasepaper/content/17058 |
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