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Elemental distribution water Rare earth elements

The regularity of the distribution of rare earth elements in plants was studied by the water culture method in which the nutrient materials can be controlled. Cucumber, the experimental plant, was treated with a solution of lanthanum chloride during its growth, and the rare earth content in different parts of the cucumber was analyzed. It was found that the tender part of the cucumber had more lanthanum than the tough part. This is in accordance with the regular distribution of essential nutrient elements in plants. [Pg.199]

Bence, A.E. (1983) Volcanogenic massive sulfides rtx k/water interactions in ba.saltic systems and their effects on the distribution of the rare earth elements and selected first. series transition elements (abst.). 4th International Symposium on Water-Rock interaction, Mi.sasa, Japan, 48. [Pg.268]

De Baar, H.J.W., German, C.R., Elderfield, H. and Van Gaans, P. (1988) Rare earth element distributions in anoxic waters of the Cariaco Trench. Geochim. Cosmochim. Acta, 52, 1203-1219. [Pg.270]

Silver, although a relatively rare element, is distributed throughout the Earth s crust, occurring naturally as argentite (Ag2S) and horn silver (AgCl), at levels up to 0.2 mg kg (Heslop and Robinson 1967). Silver is present in rainwater, while river waters contain 0.03-0.3 pg (Bowen 1979 see Part I, Chapter 1) and sea water from 0.002 (surface) to 0.4 pg kg (deep sea) (Martin etal. 1983). [Pg.756]

Liang T, Wang LJ, Zhang CS, Ding LQ, Ding SM, Yan X (2003) Contents and their distribution pattern of rare earth elements in water and sediment of intertidalite. J Chin Rare Ear Soc 23(l) 68-74 (in Chinese with English abstract)... [Pg.131]

Many agricultural processes such as control of fertilizers and pesticides are influenced by surface and sub-surface movement, percolation and infiltration of water. Stable activateable tracers, such as bromide, analyzed by NAA, have allowed the soil scientist to quantify the distribution of agricultural chemicals under a wide variety of environmental and land use influences. In one of the study on phosphate fertilizers in Egypt using NAA, Abdel-Haleem et al. (2001) have reported the presence of heavy metals Fe, Zn, Co, Cr, and Sc as well as rare earth elements La, Ce, Hf, Eu, Yb and Sm in the samples containing the phosphate fertilizer components (e.g., rock phosphate, limestone, and sulfur) from which fertilizer is produced as final output product. The measurement of Ca/Si concentration ratio in the concrete samples has been carried out using NAA with 5Ci Am-Be neutron source (Khelifi et al. 1999). [Pg.266]

In this volume of the Handbook the authors sample the gamut of rare-earth-element involvement on the planet. From the magnetic characteristics of atomic nuclei, to the electronic antenna effects of ligands on encapsulated atoms, to the effects on spectral properties of neighboring atoms in a crystalline array, to the chemical combination of the rare-earth elements with phosphorus, to the chemical constitution of vapor species of their halides, to the distribution of these elements in the waters that envelope the earth. [Pg.653]

Because the heavier elements are formed in localized areas of the universe, the distribution of these elements is uneven. The elemental composition of the earth, for example, is very different from most of the rest of the universe. Table 18.5 lists the percent abundance of elements in the earths crust, waters, and atmosphere. Note that eleven elements make up over 99% of the planets mass. Some elements that play major roles in our culture and technology—such as copper, tin, zinc and gold—are actually very rare. [Pg.743]

The distribution of ruthenium and rhodium traces in the ocean has been investigated by RIS -VETA. Both elements are rare and their distribution is of great geological and geochemical importance. The abundance of Ru and Rh in the Earth s crust is estimated to be 1-100 pg/g and can not be directly measured by current analytical techniques. The fire assay method and concentration by polymer sorbents were used prior to RIS analysis. Concentrations of Ru varied from 1.3 pg/mL in ocean water to 7.6 ng/g in Red Sea sediments. Concentrations of Rh in ocean water were 3- lOpg/mL. [Pg.740]


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