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| Assessment of heavy metal passivation technology and evaluation of cadmium-contaminated soil based on CNKI literature analysis |
| Received:December 06, 2018 |
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| KeyWord:cadmium contaminated soil;passivation technology;CNKI database;bibliometric method;effectiveness evaluation |
| Author Name | Affiliation | E-mail | | LI Ang | School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China | | | HOU Hong | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | SU Ben-ying | National Ecological Restoration Technology Demonstration Base of Mentougou District, Beijing 102300, China | | | HUANG Zhan-bin | School of Chemical and Environmental Engineering, China University of Mining and Technology(Beijing), Beijing 100083, China | | | FENG Yan | Changle County Baodu Street Integrated Agricultural Service Center, Changle 262400, China | | | WU Zhi-hao | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | | | SUN Zai-jin | State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China | sunzj@craes.org.cn |
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| Abstract: |
| To understand the research progress on heavy metal passivation of cadmium-contaminated soil in China, software tools such as CiteSpaceV and Excel 2013, and bibliometric method were used. The data were obtained from CNKI database for the duration of 1980-2018. The analysis involves multiple dimensions, including chronological analysis, research institutions, core authors, research hotspots, types of passivating agents, and number of passivating agents. Moreover, the cumulative probability distribution model was used to establish the effects of evaluation and classification. The results showed that published related literature has increased exponentially in recent years. The main sources of literature are universities and institutes. Biochar, lime, and sepiolite are focused upon as passivation agents. The probability distribution indicated that the reduction effect can be initially evaluated as "excellent" when the cadmium reduction rate in agricultural products is greater than 57.1% or "effective" when the reduction rate is greater than 50.1%; for the cadmium reduction rate in agricultural products less than 34.5% or the reduction rates less than 26.9%, the effect can be initially evaluated as "poor". The paper also points out that to strengthen the study of passivation technology's mechanisms, comprehensive and standardization scientific effectiveness evaluation methods need to be investigated in future research. |
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