摘要
利用微波消解-双道原子荧光光谱法测定果蔗地土壤中的As和Hg含量,验证检测方法的检出限、准确度与精密度,分析果蔗地土壤中重金属As和Hg的空间分布特征,并对果蔗地土壤中As和Hg的污染状况进行评价。结果表明：果蔗地土壤中As的含量范围为8.78~28.22 mg·kg-1,平均值为16.69 mg·kg-1,而Hg的含量范围为0.09~0.61 mg·kg-1,平均值为0.28 mg·kg-1。As元素在土壤中变异较小,而Hg元素在土壤中变异较大。频数分布图显示,土壤中As元素含量不符合正态分布,含量大多在9.0~24.0 mg·kg-1,土壤中Hg元素含量基本符合正态分布,含量大多在0.10~0.48 mg·kg-1。以土壤环境质量标准为评价依据,果蔗地土壤As含量处于无污染的清洁水平,而土壤Hg的污染指数大于1的样点占总数的33.3%,需要引起管理者的注意。
Microwave digestion-double channel atomic fluorescence spectrometry method was used to determine the concentrations of As and Hg in chewing cane soil. The detection limitation,accuracy and precision of the method were validated,the spatial distribution was analyzed,and the characteristics of As and Hg pollution in chewing cane soil were assessed. The results showed that the range of As concentration in soils is between 8. 78 and 28. 22 mg·kg- 1,the average concentration is 16. 69 mg·kg- 1,the range of Hg concentration in soils is between 0. 09 and 0. 61 mg·kg- 1,the average concentration is 0. 28 mg·kg- 1. The variation of As in soils is small,whereas that of Hg concentration is large. Frequency distribution graphics of As and Hg showed that the concentration of As isn＇t according with the normal distribution and the concentration are mostly between 9. 0 and 24. 0 mg·kg- 1,the concentration of Hg is according with the normal distribution approximately and the concentration are mostly between 0. 10 and 0. 48 mg · kg- 1. Based on the environmental quality standard for soils,As concentration in soil is at clean level,but there are 33. 3 % of sample points with Hg pollution index exceeding 1,and this should be attracted the attention of the administrators.
出处
《西南农业学报》
CSCD
北大核心
2015年第4期1742-1745,共4页
Southwest China Journal of Agricultural Sciences
基金
广西农科院基本科研业务专项重点项目(桂农科2014JZ01
桂农科2013YZ07)
广西农科院基本科研业务专项团队项目(2015YT92)
关键词
土壤
砷
汞
空间分布
污染评价
原子荧光光谱
As and Hg
soil
Spatial distribution
Pollution evaluation
Atomic fluorescence spectrometry
