|Table of Contents|

Distribution of Cd and Impact Factors on the Migration in Soil-rice System in Typical Area of Yangtze River Delta Region(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2011年第03期
Page:
288-295
Research Field:
水资源与环境
Publishing date:

Info

Title:
Distribution of Cd and Impact Factors on the Migration in Soil-rice System in Typical Area of Yangtze River Delta Region
Author(s):
CHEN Ling-xiao1SONG Yin-xian1YUAN Xu-yin2YANG Zhong-fang3CHEN Yang1CHEN Jun1JI Jun-feng1
1. School of Earth Sciences and Engineering, Nanjing University, Nanjing 210093, Jiangsu, China; 2. School of Environment, Hohai University, Nanjing 210024, Jiangsu, China; 3. School of the Earth Sciences and Resources, China University of Geosciences, Be
Keywords:
Cd rice heavy metal soil accumulation Yangtze River Delta
PACS:
X825;X826
DOI:
-
Abstract:
In order to find the Cd pollution and impact factors on the migration in soil-rice system in Yangtze River Delta Region, 66 groups of soil, rice shoot and rice grain from typical area were sampled; contents of heavy metals and major elements, soil pH, soil total organic carbon of those samples were measured; Cd pollution in soil and rice grain were evaluated by the means of relevance analysis, and the distribution of Cd were shown; impacts of soil pH and organic carbon, and other metal elements on Cd accumulation in rice were discussed. The results showed that mass fraction of Cd for the soil samples in typical area of Yangtze River Delta Region were(81.39-1 441.00)×10-9 with the average of 277.40×10-9, and those of the grain samples were(10.44-692.40)×10-9 with the average of 55.63×10-9; according to the secondary level of Soil Environmental Quality Standard(GB 15618—1995), 9.09% of the soil exceeded the standard level for Cd content, and most of the Cd-polluted samples were from Suzhou, Zhenjiang and Changzhou; according to Maximum Levels of Contaminants in Foods Standard(GB 2762—2005), 4.55% of rice grains exceeded the standard level for Cd content, and most of the Cd-polluted samples were from Suzhou and Wuxi; impact factors on Cd accumulation in rice were soil pH and contents of total organic carbon, CaO, MgO and P; contents of S and Se were closely related with that of Cd, and Cd cooperated with Zn in rice, but contents of S, Se, Zn in soil had no significant influence on Cd accumulation in rice; increasing soil pH and content of total organic carbon could reduce Cd accumulation in rice, and increasing contents of CaO, MgO and P in soil could decrease Cd absorption in a certain extent.

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Last Update: 2011-09-20