以小麦为植物材料,利用外源稀土添加、营养液培养等人工控制手段,研究了稀土元素在植物体内的分异效应,并探讨了分异效应产生的机制.结果表明,稀土元素在小麦不同器官中出现显著分异.根系出现中稀土(MREE)富集特征和"M"型四重效应,分析是由稀土元素与PO43-的选择性沉淀造成.小麦地上部分稀土元素分布出现"W"型四重效应,分析也是由根部磷沉淀造成.与此同时,小麦茎部相对富集轻稀土(LREE),叶中相对富集重稀土(HREE).运用VMINTEQ程序计算了木质部溶液中稀土元素的结合形态主要有LnEDTA-和Ln3+(Ln指稀土元素),但仅有LnEDTA-表现出HREE相对富集特征,其他形态则表现出LREE相对富集特征.分析叶部LREE/HREE分异是吸收LnEDTA-造成,而茎部LREE/HREE分异则是吸收Ln3+和其他形态稀土的结果.细胞壁对Ln3+的吸附也是导致以上分异特征的重要因素.
参考文献
| [1] | Shabani M B;Akagi T;Shhimizu H et al.Determination of trace lanthanides and yttrium in seawater by inductebely coupled plasma mass spectrometry after preconcentration with solvent extraction and back-extraction[J].Analytical Chemistry,1990,62:2709. |
| [2] | 丁士明,张自立,梁涛,孙琴.土壤中稀土对有效氮形态分配和转化的影响[J].中国稀土学报,2004(03):375-379. |
| [3] | 王立军,梁涛,章申,丁士明,王秀丽,阎欣.外施稀土在农田生态系中的生物地球化学循环与残留[J].中国稀土学报,2004(05):676-681. |
| [4] | Liang T;Yan BZ;Zhang S;Wang LJ;Wang NF;Liu HS .Contents and the biogeochemical characteristics of rare earth elements inwheat seeds[J].Biogeochemistry,2001(1):41-49. |
| [5] | WEI Z G;Yin M;Zhang X .Rare earth elements in naturally grown fern dicranopteris linearis in relation to their variation in South-Jiangxi region[J].Environmental Pollution,2001,114:345. |
| [6] | Wyttenbach A;Furrer V;Schleppi P;Tobler L .Rare earth elements in soil and in soil-grown plants[J].Plant and Soil,1998(2):267-273. |
| [7] | 张智勇,李福亮,王玉琦,肖海清,柴之芳.土壤-植物体系稀土元素的分异现象[J].中国稀土学报,2002(01):94-96. |
| [8] | 张智勇,王玉琦,孙景信,李福亮,柴之芳,许雷,李信,曹国印.分子活化分析研究植物原生质体中的稀土元素[J].科学通报,2000(05):502-505. |
| [9] | 丁士明,梁涛,王立军,孙琴.稀土元素在土壤-小麦体系中的迁移和分馏特征[J].农业环境科学学报,2003(05):519-523. |
| [10] | Xu XK.;Zhu WZ.;Wang ZJ.;Witkamp GJ. .Distributions of rare earths and heavy metals in field-grown maize after application of rare earth-containing fertilizer[J].Science of the Total Environment,2002(1/3):97-105. |
| [11] | Fu FF;Akagi T;Yabuki S;Iwaki M .The variation of REE (rare earth elements) patterns in soil-grown plants:a new proxy for the source of rare earth elements and silicon in plants[J].Plant and Soil,2001(1):53-64. |
| [12] | FU F F;Tasuku A .2000.Distribution of rare earth elements in seaweed:implication of two different soruces of rare earth elements and silicon in seaweed[J].Journal of Philosophy,2000,36:62. |
| [13] | Wyttenbach A;Patrik S;Jurg B et al.The accumulation of the rare earath elements and of scandium in successive needle age classes of norway spruce[J].Biological Trace Element Research,1994,41:29. |
| [14] | Henderson P.Rare Earth Element Geochemistry[M].Amsterdam:Elsevier Press,1984 |
| [15] | Johannesson H K;Lyons W B;Yelken M A et al.Geochemistry of the rare earth elements in hypersaline and dilute acidic natural terrestrial waters:complexation behavior and middle rare earth element enrichments[J].Chemical Geology,1996,133:125. |
| [16] | Johannesson H K;Zhou X P .Origin of middle rare earth elements enrichments in acid waters of a canadian high arctic lake[J].Geochimica et Cosmochimica Acta,1999,63:153. |
| [17] | Hannigan RE.;Sholkovitz ER. .The development of middle rare earth element enrichments in freshwaters: weathering of phosphate minerals[J].Chemical geology,2001(3-4):495-508. |
| [18] | Byrne RH.;Schijf J.;Liu XW. .THE INFLUENCE OF PHOSPHATE COPRECIPITATION ON RARE EARTH DISTRIBUTIONS IN NATURAL WATERS[J].Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society,1996(17):3341-3346. |
| [19] | Diatloff E;Asher C J;Smith F W .Use of Geochem-PC to predict rare earth element (REE) species in nutrient solutions[J].Plant and Soil,1993,155/156:251. |
| [20] | Peppard D F;Mason G W;Lewey S .A tetrad effect in the liquid-liquid extraction ordering of lanthanides (Ⅲ)[J].Journal of Radioanalytical and Nuclear Chemistry,1969,31:2271. |
| [21] | Akagi T;Shabai M B;Masuda A .Lanthanide tetrad efect in kimuraite [CaY2(CO3)4·6H2O]:implication for a new geochemical index[J].Geochimica et Cosmochimica Acta,1993,57:2899. |
| [22] | 刘丛强,吴佳红,于文辉.氢氧化铁胶体/水界面作用与地表水中稀土元素的分异--pH控制机理的实验研究[J].中国科学D辑,2001(10):873-880. |
| [23] | Masuda A;Ikeuchi Y .Lanthanide tetrad effect observed in marine environment[J].Geochemical Journal,1979,13:19. |
| [24] | BROWN D S;Allison J D.MINTEQA2:A Geochemical Assessment Model for Environmental System[M].Version 3.0 User′s manual,1990 |
| [25] | Millero F J .Stability constants for the formation of rare earth inorganic complexes as a function of ionic strength[J].Geochimica et Cosmochimica Acta,1992,56:3123. |
| [26] | Lee J H;Byrne R H .Examination of comparative rare earth element complexation behavior using linear free-energy relationships[J].Geochimica et Cosmochimica Acta,1992,56:1127. |
| [27] | Byrne R H;Li B Q .Comparative complexation behaviour of the rare earth[J].Geochimica et Cosmochimica Acta,1995,59(22):4575. |
| [28] | Wood S A .The arueous geochemistry of the rare-earth elements and yttrium.ⅠReview of available low-temperature data for inorganic complexes and the inorganic REE speciation of natural waters[J].Chemical Geology,1990,82:159. |
| [29] | SUN HAO;WANG XIAORONG;WANG QIN .THE EFFECTS OF CHEMICAL SPECIES ON BIOACCUMULATION OF RARE EARTH ELEMENTS IN RICE GROWN IN NUTRIENT SOLUTION[J].Toxicological and environmental chemistry,1999(1/2):75-85. |
| [30] | Marschner H.Mineral Nutrition of Higher Plants[M].Cambridge:Acadimic Press,1995 |
上一张
下一张
上一张
下一张
计量
- 下载量()
- 访问量()
文章评分
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%