武夷山上梅乡生态蔬菜基地土壤重金属含量及形态分布特征  

Content and Chemical Speciation of Heavy Metals in Vegetable Soils in Shangmei Town Wuyishan City

作　　者：李灵[1,2] 唐辉[3] 张玉[4] 于标[1,2] 陈文龙[1,2] 

机构地区：[1]福建省生态产业绿色技术重点实验室,福建武夷山354300 [2]武夷学院生态与资源工程学院,福建武夷山354300 [3]陕西理工学院外国语学院,陕西汉中723003 [4]武夷学院土木工程与建筑学院,福建武夷山354300

出　　处：《武夷学院学报》2015年第12期1-6,共6页Journal of Wuyi University

基　　金：南平市科技局项目(N2009Z10-3);武夷学院对接南平产业发展专项项目(2011DJ08);武夷山风景名胜区管理委员会资助项目(2008-03)

摘　　要：在武夷山上梅乡生态蔬菜基地采集了47个表层土壤样品,采用BCR连续提取法分析了土壤重金属Cu、Zn、Pb和Cr不同形态的含量,并探讨了柠檬酸最佳淋洗条件下对Pb形态分布的影响。结果表明:(1)武夷山上梅乡生态蔬菜基地土壤重金属Cu、Zn、Cr和Pb平均含量分别为46.01、247.69、154.42和58.74mg/kg,均低于国家《土壤环境质量标准》二级标准限值;(2)Cu、Zn和Cr主要以残渣态存在,分别占总量的80.23%、90.80%和91.66%,而Pb各形态占总量的比例大小分别为铁锰氧化物结合态(34.30%)>残渣态(23.03%)>有机结合态(19.44%)>碳酸盐结合态(14.13%)>可交换态(5.70%)>水溶态(3.41%),Pb活性态占总量的比例高达76.97%。(3)在柠檬酸浓度为0.1mol/L,pH=5,震荡时间为24h的最佳条件下,Pb的去除率为35.39%,残渣态的比例由淋洗前的23.03%增大至淋洗后的59.49%,而活性态的比例由淋洗前的76.97%减少至淋洗后的40.51%。By means of the BCR-sequential extraction procedure, the chemical speciation of heavy metals （Cu, Cr, Pb and Zn） of forty seven top soil samples in ecological vegetable base from Shangmei town Wuyishan city was analyzed in this paper. And the content change of Pb forms was investigated after citric acid washing. The research results show that ：（1）The average contents of Pb, Zn, Cr and Cu in soil were 46.01, 247.69, 154.42 and 58.74 mg/kg, respectively. Soil heavy metal contents were in the range of the secondary grade standard of National Soil Environmental Quality;（2）Heavy metal Cu,Zn and Cr was mainly associated with residual fraction, and the residual fraction of Cu,Zn and Cr accounted for 80.23%,90.80% and 91.66% of the total heavy metal content,respectively. The different fraction of Pb was ranked as follows： Fe-Mn oxide（34.30%）〉 residual （23.03%）〉 organic （19.44%）〉earbonate（14.13%）〉exchangeable（5.70%）〉water soluble （3.41%）o The percent of Pb active form was high to 76.97%.（3）The removal rates of Pb is35.39% under the conditions of citric acid solu- tion concentration 0.1mol/L, citric acid solution pH 5 and washing time 24 hours. The percent of residual form was23.03% increasing to 59.49%,and the percent of active form in total content was76.97% decreasing to 40.51% in total content after citric acid washing.

关 键 词：重金属 形态 BCR连续提取法 武夷山市 

分 类 号：S151.9[农业科学—土壤学]