| 1 | Environmental risks for application of iron and steel slags in soils in China: A review显示文摘Iron and steel slags are smelting wastes, mainly including blast furnace slag(BFS) and steel slag(SS) produced in the iron and steel industry. Utilization of iron and steel slags as resources for solving the problem of slag disposals has attracted much attention with increasing iron and steel smelting slags in China. Because the iron and steel slags contain calcium(Ca), magnesium(Mg), phosphorus(P), and silicon(Si), some have tried to use them as Si-and P-fertilizers, for producing Ca-Mg-P fertilizers, or as soil amendments in agriculture. However, in the iron metallurgical process, several pollutants in iron ores can inevitably transfer into iron and steel slags, resulting in the enrichment of pollutants both in BFS(mainly nickel(Ni), copper(Cu), mercury, zinc(Zn),cadmium(Cd), chromium(Cr), arsenic, lead, selenium, fluorine(F), and chlorine(Cl)) and in SS(mainly Ni, Cr, Cd, Zn, Cu, F, and Cl), in which some of pollutants(especially Cr, Ni, F, and Cl) exceed the limits of environmental quality standards for soils and groundwater. The elements of manganese, barium,and vanadium in iron and steel slags are higher than the background values of soil environment. In order to ensure soil health, food safety, and environmental quality, it is suggested that those industrial solid wastes, such as iron and steel slags, without any pretreatment for reducing harmful pollutants and with environmental safety risk, should not be allowed to use for soil remediation or conditioning directly in farmlands by solid waste disposal methods, to prevent pollutants from entering food chain and harming human health. | Xiaobin WANG Xiuying LI Xiang YAN Cheng TU Zhaoguo YU | 2021 | Pedosphere2021，31，1： | 14 |
| 2 | Urban Land-banking Planning:A New Instrument to Regulate Urban Land Supply-demand of Nanjing City显示文摘It is the major purpose of the paper to present the urban land-banking planning and its functions of promoting the urban land-banking system and land use administration.The urban land-banking system has the potential attribute of acting as an irreplaceable role in urban land administration,but its unexpected function-deviation has impacted its implementation effect in China.A few city governments are attempting to deal with the problem by the urban land-banking planning which is expected to contribute to the extension of urban function,optimization of urban patterns,promotion of urban core competitiveness and overall construction of the urban value chain.In this paper,we primarily discuss the necessity,functions,purposes and main contents of the urban land-banking planning.Subsequently,the implementing situation of the urban land-banking system in Nan- jing is analyzed,including its integrated mode,spatio-temporal quantitative distribution and main characteristics.Finally,the background and targets including total,compositions,space,and regulation points are gradually introduced to present the Nanjing land-banking planning version 2. | Tu Xiaosong Pu Lijie Huang Xianjin Jin Xiaobin | 2008 | Chinese Journal of Population,Resources and Environment2008，6，2： | 0 |
| 3 | Comparison of Three Methods for Determination of Ammonia Nitrogen in Surface Water显示文摘Nessler's reagent spectrophotometry,gas phase molecular absorption spectrometry and ion chromatography were respectively used to determine ammonia nitrogen in surface water.The detection limit,precision,accuracy and recovery rate of the three methods were compared,and the determination results of the actual water samples were analyzed by t test.The results showed that the three methods all could meet the requirement of the laboratory quality control,and there was no significant difference in the determination results.Compared with Nessler's reagent spectrophotometry,the operation of gas phase molecular absorption spectrometry and ion chromatography operation was more convenient and fast and has no pollution,which can be used for the determination of ammonia nitrogen content in a large quantity of surface water samples. | Zuo Jia Dai Shuhao Wei Baomei Qiu Lan Tu Xiaobin | 2019 | Meteorological and Environmental Research2019，10，3： | 0 |
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