Tracing the behaviour of hexachlorobenzene in a paddy soil-rice systemover a growth season
YANG Hua , ZHENG Minghui , ZHU Yongguan
DOI:
Received March 21, 2007,Revised May 09, 2007, Accepted , Available online
Volume 20,2008,Pages 56-61
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Hexachlorobenzene (HCB), a persistent organic pollutant (POP), has been found in paddy soils. To improve the understanding of
HCB contamination in paddy soils, a laboratory simulative study was carried out to investigate the behavior of HCB in a paddy soil
and rice plants. This study was divided into three experiments. First, an experiment aimed to examine the evaporation of HCB in paddy
soil. In the second experiment, rice was planted in 10 mg/kg HCB contaminated soil and after pot culture at 3, 6, 9, and 27 weeks (at
maturity), both soil and plant samplings were scheduled to be sampled. The soil samples comprised rhizosphere soil, nonrhizosphere
soil, and unplanted contaminated soil, whereas plant samples included shoots, roots, and rice grains (dehusked). Lastly, in this part,
HCB in xylem saps was designed to be examined. The results showed that (1) the HCB translocation from paddy soil to rice by
vaporization; (2) the HCB concentration in rice grains was surprisingly high; (3) the observed HCB decrease in rice rhizosphere o ers
a potential means for in situ HCB degradation; (4) HCB might not be transported along transpiration in rice.
