Department of Soil and Water Conservation, National Chung-Hsing University, Taichung 402, Taiwan, ROC.
Bioresour Technol. 2010 May;101(9):3033-9. doi: 10.1016/j.biortech.2009.12.041. Epub 2010 Jan 13.
Wastewater is often co-contaminated with chromium, chelating agents, and chloride. Influences of Cr(3+) speciation on Cr phytoremediation by Ipomonea aquatica were investigated. MINEQL+ was employed to estimate Cr speciation. Statistic regression was used to investigate the relationships between Cr speciation and accumulation. I. aquatica accumulated high Cr concentration (13,217 mg kg(-1)) in the root at Cr(3+) of 10 mg l(-1) and EDTA of 10(-4) M after 14 d growth. Pearson correlation analysis indicates that root Cr concentration significantly correlated with Cr-EDTA speciation (r = 0.67, p < 0.05) and Cr-Cl speciation (r = 0.91, p < 0.01). Shoot Cr concentration also significantly correlated with Cr-Cl speciation (r = 0.97, p < 0.01). An increase in Cl(-) concentration to 1.72 x 10(-4) M enhanced root Cr concentration; however, the accumulation of root Cr was inhibited at high Cl(-) concentration (5.76 x 10(-5) M). Microscopic image showed that a high portion of Cr(3+) accumulated on the root surface.
污水常常受到铬、螯合剂和氯化物的共同污染。本研究考察了 Cr(3+)形态对水花生修复铬污染的影响。采用 MINEQL+估算 Cr 形态，运用统计回归分析 Cr 形态与积累量之间的关系。在 10 mg/L Cr(3+)和 10(-4) M EDTA 条件下，水花生培养 14 天后根部积累了较高浓度的铬（13217 mg/kg）。Pearson 相关性分析表明，根部铬浓度与 Cr-EDTA 形态（r = 0.67，p < 0.05）和 Cr-Cl 形态（r = 0.91，p < 0.01）显著相关。地上部铬浓度也与 Cr-Cl 形态显著相关（r = 0.97，p < 0.01）。Cl(-)浓度增加到 1.72 x 10(-4) M 会增加根部铬浓度；但在高浓度 Cl(-)（5.76 x 10(-5) M）下，根部铬的积累受到抑制。显微镜图像显示，大量 Cr(3+)积累在根部表面。
