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ASSESSMENT OF THE POTENTIAL OF VETIVER GRASS IN MITIGATION OF DIOXIN AND ARSENIC IN CONTAMINATED SOILS AT BIEN HOA AIRBASE
Dinh, N.Q., N.T.T. Huong, and N.T. Thanh Thao.
VNU Journal of Science: Earth and Environmental Sciences 34(3):(2018)

A field study was carried out to assess the potential use of Monto vetiver (Chrysopogon zizanioides L.) in mitigating dioxin contamination and the treatment of arsenic contaminated soils. The study area consisted of 3 lots of 100 m2 each. The Monto genotype, known to be a noninvasive type of vetiver grass, was planted on November 25, 2014, in two groups, lots 1 and 2, in soils with initial dioxin levels of ~1000-1800 ppt TEQ and arsenic at about 25-30 mg/kg dry soil. Group 1 (G1) received DECOM 1, a soil supplement to promote the growth of indigenous microorganisms in the rhizosphere; Group 2 (G2) served without supplement as a control; and Group 3 was left unvegetated. Results showed that vetiver grass was able to absorb dioxin into grass roots and then to grass shoots. Dioxin in soil declined significantly in both G1 and G2, though somewhat more in G1 than in G2. The correlation between dioxin content in soil samples and root samples showed a tight relationship. Results also showed that vetiver roots can take up As and transport it to the shoots. This project receives support in part from the National Academies of Sciences: http://sites.nationalacademies.org/PGA/PEER/PEERscience/PGA_181433.



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