Phytoextraction of Cadmium by Water Spinach Enhanced by EDDS and NTA from Soil

in International Symposium (oral presentation paper), 國際研討會(全文口頭發表)
標題Phytoextraction of Cadmium by Water Spinach Enhanced by EDDS and NTA from Soil
AuthorsHseu, 許正一, Jien 簡士濠, Shih Hui Wang 王思惠, & 鄧宏維
出版日期Nov 6 2012 12:0
會議地點Hanghzou and Lin'an

A greenhouse experiment was used to test the applicability of [S,S]-Ethylenediaminedisuccinic acid (EDDS) and nitrilotriacetic acid (NTA) at rates of 2.5 mmol kg-1 and 5.0 mmol kg-1, respectively, to increase the uptake of Cd by water spinach (Ipomoea aquatic Forsk) in soils with 2.5-30 mg Cd kg-1. The addition of EDDS and NTA significantly (P < 0.05) increased water soluble Cd in soils. However, the Cd concentration in the root and shoot was higher in the NTA treatment than in the EDDS treatment. No instance of Cd hyperaccumulation was observed; however, the 5.0 mmol kg-1 NTA treatment for soil with 30 mg Cd kg-1 caused the Cd concentration to increase to 86 mg kg-1, which is close to the critical concentration (100 mg kg-1) of a hyperaccumulator. The total Cd uptake in the treatments of EDDS and NTA for soils with 2.5, 5.0, and 10 mg Cd kg-1 was acceptable, and was higher than the control. The level of 5.0 mmol kg-1 EDDS was excessively high for enhanced phytoextraction in soils with 20 and 30 mg Cd kg-1. Water spinach for Cd phytoextraction is a viable alternative to using herbaceous hyperaccumulators.

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