极值理论在重金属污染土壤修复中的应用  

Application of the Extremum Theory in Remediation of Heavy Metal Contaminated Soil

作　　者：郭兵 杨庭 肖成磊 王永林 GUO Bing;YANG Ting;XIAO Cheng-lei;WANG Yong-lin(China Offshore Environmental Protection Service(Tianjin)Co.,Ltd.,Tianjin 300457,China)

机构地区：[1]中海石油环保服务(天津)有限公司,天津300457

出　　处：《四川环境》2021年第2期149-154,共6页Sichuan Environment

摘　　要：为了准确预测重金属污染地块不同区域内重金属的最大值,以便于后续筛选重金属修复技术、确定重金属修复药剂使用量等提供依据,采用极值理论方法对某重金属砷污染地块三块区域内的重金属砷浓度数据进行极值分布的统计分析,对比不同分布形式对重金属砷浓度数据拟合的效果。结果表明:广义极值分布可以很好地描述重金属砷浓度数据的分布情况,通过K-S检验、作图法和P-P散点图法验证得出广义极值分布形式对重金属砷浓度数据拟合效果最好,通过广义极值分布形式的表达式可以计算得出A、B和C区不同概率下重金属浓度的最大值。In order to accurately predict the maximum value of heavy metals in different areas of heavy metal contaminated plots,and provide basis for subsequent screening of heavy metal remediation technologies and determination of heavy metal remediation reagent usage.The extremum theory was used to analyze the extreme value distribution of heavy metal arsenic concentration data in three areas of a heavy metal arsenic contaminated plot,and the fitting effect of different distribution forms on arsenic concentration data was compared.The result showed that GEV distribution model can well describe the distribution of heavy metal arsenic's concentration data.It is concluded that the fitting degree of GEV model is the best through the K-S test,graphic method and P-P scatter plot method.Heavy metal arsenic's maximum concentration of different probability in A,B and C regions can be calculated by the expression of GEV distribution.

关 键 词：重金属砷 极值理论 广义极值分布 矩估计 

分 类 号：X53[环境科学与工程—环境工程]