Relationships between changes of three organic acids (oxalic acid, citric acid and tartaric acid) and phytoextration by Sunflower (Helianthus annum L.) in Sand Cultures Contaminated with Cadmium and Lead
Sand culture was used to investigated the Cd and Pb phytoextraction by sunflower, and changes of organic acids including oxalic acids, citric acids and tartaric acids. The results showed that bioconcentration factors (BCF) of Cd or Pb increased with time and decreased with concentrations, the highest Cd-BCF and Pb-BCF appeared in Cd5 (21) and PbSO (7.9S), respectively. The contents of oxalic acids in Cd 40 were the highest (152.20 mg L-1) at the 90th day. Citric acids in Cd10 and Pb400 treatments were higher than other Cd and Pb treatments, which was 578.12 mg-L-1, 413.87 mg-L-1, respectively at the end of the test. Tartaric acids in single Cd or Pb treatments showed increasing trend with time obviously, the highest (474.15 mg-L1) appeared in Cd5 treatments at the end of this experiment. The presence of heavy metals may influence organic acids secretion from roots. And organic acids could promote bioavailability of heavy metals or impact the mechanism of metals uptake, which might result the distinction of Cd or Pb phytoextraction by sunflower. This study may supply useful information for phytoremediation of soil contaminated with cadmium and lead in situ.
Phytoextraction sunflower cadmium lead organic acids
Zhixin Niu Lina Sun Tieheng Sun
Key Laboratory of Regional Environment and Eco-remediation, Shenyang University, Shenyang, 110044, China
国际会议
2010 International Conference on Digital Manufacturing and Automation(2010 数字制造与自动化国际会议 ICDMA 2010)
长沙
英文
149-153
2010-12-18（万方平台首次上网日期，不代表论文的发表时间）