2021, 40(3) 728-737 DOI:     ISSN: 1004-5589 CN: 22-1111/P
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Keywords
 surface soil
heavy metals
geochemical baseline
geological cumulative index
Yongcheng
Authors
ZHANG Yan
LI Yu-song
PubMed
Article by ZY
Article by Li Y

 Determination of heavy metal geochemical baseline value of surface soil in Yongcheng，Henan，and its accumulation characteristics

 ZHANG Yan，LI Yu-song

 1. Henan Institute of Geological Survey，Zhengzhou 450001，China;

2. Henan Geochemical Ecological Ｒestoration Engineering Ｒesearch Center，Zhengzhou 450001，China;
3. No. 2 Institute of Geo-environment Survey，Bureau of Geology and Mineral Exploration and Development of Henan Province，
Zhengzhou 450001，China

Abstract：

 A total of 528 surface soil samples ( 0 ～ 20 cm) were collected in Yongcheng of Henan and analyzed for seven heavy metals ( As，Cd，Cr，Cu，Ni，Pb and Zn) ． The geochemical baseline values of the seven heavy metals were determined using mathematical statistics，reference element method and cumulative frequency curve method． The accumulation levels of heavy metal pollution in different types of soils were evaluated by geological

accumulative index． The results showed that the mean baseline values of As，Cd，Cr，Cu，Ni，Pb and Zn in surface soils in Yongcheng were 11. 81，0. 183，65. 96，24. 79，32. 62，24. 74 and 71. 15 mg·kg － 1，respectively．The geological accumulation index indicated that the seven heavy metals in the most surface soils of Yongcheng were at uncontaminated level，and the samples of Cr and Ni are all uncontaminated． The proportions of no accumulation
or moderate accumulation of As，Cd，Cu，Pb and Zn are 4. 17%，2. 84%，1. 33%，0. 57% and 0. 19%，respectively，and there is a moderate accumulation point in Cd． Every element in lime concretion black soil and alkaline
soil had no accumulation level，and there were no accumulation or moderate accumulation sample in loamy and clayey fluvo-aquic soils．

Keywords：  surface soil   heavy metals   geochemical baseline   geological cumulative index   Yongcheng  
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