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Vertical distribution of dioxins in soil of Bien Hoa airbase, Vietnam

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Title: Vertical distribution of dioxins in soil of Bien Hoa airbase, Vietnam
Authors: Dang Thuong Huyen Browse this author
Igarashi, Toshifumi Browse this author →KAKEN DB
Shiraiwa, Takuya Browse this author
Keywords: Bien Hoa airbase
Vertical distribution
Dominant isomer
Issue Date: 1-Jul-2015
Publisher: Springer
Journal Title: Springerplus
Volume: 4
Start Page: 300
Publisher DOI: 10.1186/s40064-015-1064-x
Abstract: Bien Hoa airbase is a known dioxin-contaminated hotspot in Vietnam. The contamination occurred during the Vietnam War at the site where dioxins were transported, stored, sprayed, and spilled in the area. Dioxins, which are cancer inducing substances, may transfer from the soil to food crops and finally to human beings living around the area. Many surveys of dioxins in soil, water, organisms, and human have been carried out in this study area since 2002. In this paper vertical distribution of dioxins in undisturbed soil cores were examined. Twelve soil samples from three drilled cores were collected to analyze dioxin levels according to the standard Japanese analytical method. The results showed that the toxicity equivalency quantity (TEQ) in one soil sample at a depth of 2.6 m reached 3,300 pg-TEQ/g-dw. High TEQs were also observed in the clay layer. This anomaly of dioxin concentrations could be attributed to the affinity of dioxins for the clay layer. The isomer patterns in the soils were different from those in the soil of Hokkaido in that 2,3,7,8-tetrachlorinated dibenzo-p-dioxin (TCDD) was the most dominant in the soil sample. This indicates that the dioxins originate from a defoliant Agent Orange disposed at the site after the Vietnam War.
Type: article
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 五十嵐 敏文

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