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| 1 | Exchange Reaction Between Selenite and Hydroxyl Ion of Variable Charge Soil Surfaces: I. Electrolyte Species and pH Effects显示文摘Hydroxyl release of red soil and latosol surfaces was quantitatively measured using a self-made constantpH automated titration instrument, to study the changes of hydroxyl release with different added seleniteamounts and pH levels, and to study the effects of electrolytes on hydroxyl release. Hydroxyl release increasedwith the selenite concentration, with a rapid increase at a low selenite concentration while slowing down ata high concentration. The pH where maximum of hydroxyl release appeared was not constant, shifting toa lower valus with increasing selenite concentration. Hydroxyl release decreased with increasing electrolyteconcentration, and the decrease was very rapid at a low electrolyte concentration but slow at a high electrolyteconcentration. For NaC1O4, NaC1 and Na2SO4, hydroxyl release was in the order of NaClO4 > NaCl >Na2SO4, and the difference was very significant. But for NaCl, KCl and CaCl2, the order of hydroxyl releasewas NaCl > KCl > CaCl2, and the difference was smaller. The amount of hydroxyl release from Xuwenlatosol was greater than that from Jinxian red soil. Hydroxyl release existed in a wider range of pH withXuwen latosol than with Jinxian red soil, due to their difference in soil properties. However, both soils hadsimilar curves of hydroxyl release, indicating the common characteristics of variable charge soils. | ZHOU SHIWEI, ZHANG GANGYA and ZHANG XIAONIANInstitute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China) | 2003 | Pedosphere2003，13，3： | 20 |
| 2 | Remediation of copper polluted red soils with clay materials显示文摘Attapulgite and montmorillonite were utilized to remediate heavy metal polluted red soils in Guixi City,Jiangxi Province,China.The effects of clay minerals on availability,chemical distribution,and biotoxicity of Cu and Zn were evaluated.The results provided a reference for the rational application of clay materials to remediate heavy metal contaminated soils.From the sorption experiment,the maximum adsorbed Cu 2+ by attapulgite and montmorillonite was 1501 and 3741 mg/kg,respectively.After polluted red soil was amended with attapulgite or montmorillonite and cultured at 30 and 60 days,soil pH increased significantly compared to the control.An 8% increase in the amount of montmorillonite in soil and 30 days incubation decreased acid exchangeable Cu by 24.7% compared to the control red soil.Acid exchangeable Cu decreased with increasing amounts of attapulgite and montmorillonite,with best remediation effect reached at a dose of 8%.Results also showed that the Cu poisoning effect on earthworms was reduced with the addition of attapulgite and montmorillonite.Montmorillonite showed the best effect,with the addition of a 2% dose the mortality of earthworms decreased from 60% to zero compared to the control.Our results indicated that the bioavailability of Cu in soils was reduced more effectively with the application of montmorillonite than attapulgite. | Gangya Zhang Yunqing Lin Mingkuang Wang | 2011 | Journal of Environmental Sciences2011，23，3： | 18 |
| 3 | In situ fixation of metals in soils using bauxite residue: chemical assessment显示文摘 | Enzo Lombi Fang-Jie Zhao Gangya Zhang Bo Sun Walter Fitz Hao Zhang Steve P McGrath | 2002 | Environmental Pollution2002，，3： | 2 |
| 4 | Influence of Neutral Salts and pH on Exchangeable Acidity of Red Soil and Latosol Colloids显示文摘In the present work, the exchangeable acidity of a red soil colloid and a latosol colloid at different pH during reacting with four neutral salts was measured. The results show that the exchangeable acidity increased with increasing amounts of the neutral salts added, and the relation between them was almost linear. When the amount of the neutral salt added was lower than a certain value, the slope of the line was high, and the slope turned low when the amount exceeded that value, so there was a turning point in each line. The addition amounts of the neutral salts for the turning points were affected by the cation species of the neutral salts, but pH had less effect on them. After the turning points occurred, the exchangeable acidity of the red soil colloid still gradually increased with the addition amounts of the neutral salts, but that of the latosol colloid did not increase any more. The exchangeable acidity in NaClO4, KClO4 and NaCl solutions increased at first, and then decreased with increasing pH, that is to say, peak values appeared. The peak positions of the exchangeable acidity in relation to pH changed with neutral salt solutions and were affected by the surface characteristics of the soil colloids, but not affected by the amounts of the neutral salts added. The exchangeable acidity in the Ba(NO3)2 solution increased continuously with increasing pH. The exchangeable acidity of the red soil colloid was obviously larger than that of the latosol colloid. | ZHOU SHIWEI, ZHANG GANGYA and ZHANG XIAONIAN Institute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China) | 2002 | Pedosphere2002，12，1： | 2 |
| 5 | In situ fixation of metals in soils using bauxite residue: biological effects显示文摘 | Enzo Lombi Fang-Jie Zhao Gerlinde Wieshammer Gangya Zhang Steve P McGrath | 2002 | Environmental Pollution2002，，3： | 1 |
| 6 | In situ fixation of metals in soils using bauxite residue: chemical assessment显示文摘 | Enzo Lombi Fang-Jie Zhao Gangya Zhang Bo Sun Walter Fitz Hao Zhang Steve P McGrath | 2002 | Environmental Pollution2002，，3： | 1 |
| 7 | Determination of Surface Area of Red Mud and Beringite Using Methylene Blue Method显示文摘The adsorption of methylene blue (MB) on three soil amendments, red mud from Hungary, red mudfrom UK and beringite from Belgium, was studied to determine the surface areas of the amendments usinga 0.005 mol L-1 NaCl solution and deionised water as background solutions. The surface areas determinedby the methylene blue method in the 0.005 mol L-1 NaCl solution were 3.357, 2.340 and 5.576 m2 g-1 forred mud (Hungary), red mud (UK) and beringite, respectively slightly lower than those in the deionisedwater system. The largest surface area of beringite suggested that the MB could adsorb effectively on theinterlayer surface of illite. The effect of NaCl on the surface areas was relatively small and may therefore beignored. Both the 0.005 mol L-1 NaCl solution and deionised water could be used as a background solutionfor measurement of surface area of oxide-rich materials. | ZHANG GANGYA, LUO YONGMING and DENG XIHAIInstitute of Soil Science, the Chinese Academy of Sciences, Nanjing 210008 (China) | 2002 | Pedosphere2002，12，2： | 0 |
| 8 | Effects of Electrolyte Anions and pH on Adsorption of Snlfate by Variable Charge Soils | ZHANG GANGYA, G. M. BRUMMER and ZHANG XIAONIAN (Instttute of Soil Science, Chinese Academy of Sctences,Nanjing 210008 ( China))Department of Soil Sctence, University of Bonn, Nussaliee 13, 53115 Bonn ( Germany) | 1994 | Pedosphere1994，4，3： | 0 |
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