| 无机离子SO42-对小麦幼苗积累稀土的影响 |
| 摘要点击 1253 全文点击 1038 投稿时间：1999-05-28 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 稀土元素 SO42- 积累 小麦幼苗 |
| 英文关键词 rare earth elements, SO42-, bioaccumulation, wheat seedling. |
|
| 中文摘要 |
| 采用ＭＩＮＴＥＱＡ 程序计算出在无机离子SO42-存在下，轻（Ｌａ）、中（Ｇｄ）、重（Ｙ）３ 种稀土元素在溶液中的形态分布．研究了在水培条件下ＳＯSO42-对３种稀土元素在小麦幼苗根、茎和叶部的积累规律．热力学实验表明，小麦幼苗在加SO42-的稀土元素溶液中培养３０ｄ 后，小麦根部对Ｌａ、Ｇｄ 的积累受抑制，而对Ｙ的积累却明显提高；加入SO42-后茎叶部对Ｌａ、Ｙ积累值改变不明显，但对Ｇｄ的积累有所增加．生长动态实验表明，在SO42-存在下，小麦幼苗根部对稀土的积累随时间增加而增加，其积累值符合线性递增函数方程，相关系数ｒ＞ ０．９４；而茎叶部最初积累能力较强，SO42-的加入对小麦植株动态吸收稀土规律无明显影响． |
| 英文摘要 |
| The species of light (La)、medium(Gd)and heavy(Y)rare earth elements(REEs)with SO42- were calculated by MINTEQA procedure. The effects of SO42- on the bioaccumulation of three REEs in wheat seedling were investigated. The results showed that bioaccumulation values of La and Gd in roots became lower after adding SO42- in culture solution containing 2.0 mg/L REE, but the contrary law was obtained for Y. Bioaccumulation values of three REEs in tops(steam & leave)were only increased of Gd after adding SO42- respectively. Kinetic experimental results indicated that bioaccumulation values of REEs in roots in 30 days were correlated with the linear growth equation(correlation factors are higher than 0.94) in the culture solution containing 2.0 mg/L REE+0.01 mol/L SO42- , and those in tops were higher in initial culture time. The influence of the adding SO42- on the law of wheat seedling absorbing REEs is not obvious. |
