Pedosphere 28(3): 511--520, 2018
ISSN 1002-0160/CN 32-1315/P
©2018 Soil Science Society of China
Published by Elsevier B.V. and Science Press
Effect of Silicon on Arsenic Concentration and Speciation in Different Rice Tissues
LI Gang1,2, ZHENG Maozhong1,3, TANG Jianfeng1,2, SHIM Hojae4, CAI Chao1
1Key Lab of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021(China)
2Ningbo Urban Environment Observatory and Monitoring Station, Ningbo 315830(China)
3College of Ecology and Resource Engineering, Wuyi University, Wuyishan 354300(China)
4University of Macau, Taipa, Macau SAR(China)
Corresponding Author:LI Gang
ABSTRACT
      Rice is a major source of inorganic arsenic (As) exposure for billions of people worldwide. Therefore, strategies to reduce As accumulation in rice should be adopted. Silicon (Si) application can effectively mitigate As accumulation in rice. In this study, a pot experiment was performed to investigate the effect of Si on As speciation and distribution in different rice tissues. The results showed that Si addition significantly increased As and Si concentrations in soil solution and Si concentration in iron plaque formed around rice root surface, whereas As in the iron plaque was significantly decreased. Total As concentrations in the stem, leaf, husk, and brown rice were remarkably decreased by 51.9%, 31.9%, 33.8%, and 24.1%, respectively, after Si addition, and inorganic As concentrations were reduced by 52.3%, 35.5%, 50.1%, and 20.1%, respectively. Moreover, both dimethylarsinic acid concentration and percentage in rice grain were significantly elevated by Si application. Therefore, Si application is promising as a way to mitigate inorganic As accumulation in rice and to reduce consumer health risk.
Key Words:  arsenic accumulation,contamination,dimethylarsinic acid,health risk,inorganic arsenic,iron plaque,rice grain,root surface
Citation: Li G, Zheng M Z, Tang J F, Shim H, Cai C. 2018. Effect of silicon on arsenic concentration and speciation in different rice tissues. Pedosphere. 28(3):511-520.
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