HR: 0800h
AN: B51D-0250    [Abstracts]
TI: Dynamic Iodine Uptake Process in Vegetation Labeled by I-125
AU: * Weng, H
EM: gswenghx@zju.edu.cn
AF: Institute of Environment & Biogeochemistry, Zhejiang University, 38 Zheda Road, Hangzhou, 310027 China
AU: Yan, A
EM: yal200@126.com
AF: Institute of Environment & Biogeochemistry, Zhejiang University, 38 Zheda Road, Hangzhou, 310027 China
AU: Hong, C
EM: hcl76212@sohu.com
AF: Institute of Environment & Biogeochemistry, Zhejiang University, 38 Zheda Road, Hangzhou, 310027 China
AU: Qin, Y
EM: 10306165@gstu.zju.edu.cn
AF: Institute of Environment & Biogeochemistry, Zhejiang University, 38 Zheda Road, Hangzhou, 310027 China
AU: Xie, L
EM: thankclever_@tom.com
AF: Institute of Environment & Biogeochemistry, Zhejiang University, 38 Zheda Road, Hangzhou, 310027 China
AB: Low iodine in vegetation is responsible for the occurrence of iodine deficiency in human body. It is of important scientific and practical implications to thoroughly understand the absorption and accumulation process of iodine in vegetation and to seek efficient pathways supplementing iodine for human health. Through aquaculture trial of green vegetable, the dynamic absorption process of I-125, as an isotopic tracer, and its accumulation and distribution in vegetable are studied. The results show that, after green vegetable is aqua-cultured for 5 min, micro I-125 can be monitored in root and after 10 min, it is also monitored in leaves, which indicates a rapid absorption and transportation. As culture time continues, I-125 in root, stem and leaves apparently increases, but the content distribution is differing. Most of the I-125 absorbed by green vegetable is enriched in root, and only one fourth of the total amount is transported upwards and mainly distributes in stem. The content of I-125 in leaves accounts for 5% which is mainly accumulated around the leaf margin. I-125 uptake in stem is larger at night than at daylight, whereas in leaves, its uptake is lower at night than at daylight, suggesting that iodine uptake is an active process and its transportation and accumulation process is related to photosynthesis.
DE: 0400 BIOGEOSCIENCES
DE: 0414 Biogeochemical cycles, processes, and modeling (0412, 0793, 1615, 4805, 4912)
DE: 0420 Biomolecular and chemical tracers
DE: 0470 Nutrients and nutrient cycling (4845, 4850)
SC: Biogeosciences [B]
MN: Fall Meeting 2005