基于CNKI文献分析的镉污染土壤钝化技术概况及效果评估研究

为探讨目前国内针对镉污染土壤的钝化修复研究进展,以CNKI数据库中1980—2018年的镉污染土壤钝化修复的文献为数据源,利用CiteSpaceⅤ和Excel 2013等软件工具,运用文献计量法,对文献从多个维度(即年代分析、研究机构、核心作者、研究热点、钝化剂的种类数量、钝化剂用量及效果评估等)进行文献数据整理和分析,并利用累积概率分布模型初步建立了效果评估和分级方法。结果表明:近年来发表相关文献的数量呈指数增长趋势,主要为高等院校和科研院所;钝化剂以生物炭、石灰和海泡石研究较多。通过概率分布计算:农产品镉降低率大于57.1%或有效态降低率大于50.1%时,效果可初步评估为优;当农产品镉降低率小于34.5%或有效态降低率小于26.9%时,效果可初步评估为差。论文指出钝化修复技术应加强机理方面研究,建立全面科学化、标准化成效评估方法。

Assessment of heavy metal passivation technology and evaluation of cadmium-contaminated soil based on CNKI literature analysis

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.