نتایج جستجو برای: trace lead

تعداد نتایج: 402700  

کریم‌پور, محمدحسن, جزی, محمدعلی , ملک‌زاده شفارودی, آزاده ,

Nakhlak lead deposit, one of the oldest and largest Iranian lead mines, is located in 55 Km from the northeast of Anarak town. Nakhlak deposit occurs as stratabound and epigenetic in Upper Cretaceous dolomitic carbonates host rocks. The hypogene ore deposits include galena and barite that are associated in supergene zone with cerussite. Galena occurs as coarse and fine grains with replacement a...

Journal: :Journal of Pharmacy And Bioallied Sciences 2020

2004
R. K. Workman S. R. Hart M. Jackson M. Regelous K. A. Farley H. Staudigel

[1] An in-depth Sr-Nd-Pb-He-Os isotope and trace element study of the EMII-defining Samoan hot spot lavas leads to a new working hypothesis for the origin of this high Sr/Sr mantle end-member. Systematics of the Samoan fingerprint include (1) increasing Pb/Pb with time from 18.6 at the older, western volcanoes to 19.4 at the present-day hot spot center, Vailulu’u Seamount, (2) en-echelon arrays...

1999
Jeremy B. Fein Patrick V. Brady Jinesh C. Jain Ronald I. Dorn Jong-Un Lee

Mobilization of contaminant Pb and other cations from a weathered andesite was examined by conducting water–rock leaching experiments to measure release rates of the major and minor elements found in the bulk rock. Experiments were conducted for over 600 h, at pH 3 and 6.5, as a function of grain size, and in the presence and absence of a common subsurface bacterial species, Bacillus subtilis. ...

2016
Saranga Diyabalanage Thamara Navarathna Hemalika T K Abeysundara Sanath Rajapakse Rohana Chandrajith

BACKGROUND Samples of 226 new improved and 21 indigenous rice (Oryza sativa L.) varieties were collected from the rice fields in three climatic zones of Sri Lanka and concentrations of 18 trace elements (Li, B, Al, Cr, Mn, Fe, Co, Ni, Cu, Zn, As, Se, Sr, Mo, Cd, Ba, Pb and Bi) were measured giving particular emphasis on Se, Cd and As using ICP-MS. The two way multivariate analysis of variance (...

1991
H. Newman

We report on a study of the correlation between radiation damage of bismuth germanate (BGO) scmtillator crystals and trace impunties in the crystal . The light yield and the absorption spectra of doped BGO crystals were measured, both before and after irradiation . While trace concentrations of Cr, Mn, Fe and Pb m BGO were found to lead to substantial radiation damage, traces of Al, Ca, Cu and ...

2013
M. H. Abdo

Profiles of some trace elements (Fe Mn, Zn, Cu, pb and Cd) were detected in saline water and surficial sediment of Wadi El-Natrun depression lakes. The trace elements concentrations largely indicate the influence of weathering of terrigenous sources on land. The order of the studied trace elements in brine lakes of Wadi El-Natrun from high to low concentrations are Mn > Pb > Fe > Zn > Cu > Cd a...

2006
SHAO-WEI LIAO

The ability of water hyacinth ( Eichhornia crassipes Mart. Solms.) to absorb and translocate cadmium (Cd), lead (Pb), copper (Cu), zinc (Zn), and nickel (Ni) was studied in the Erh-Chung wetlands. Translocation ability was defined as the quantity of Cu, Pb, Cd, Ni, and Zn translocated in the plant’s tissues, and was expressed as a root/shoot ratio. The ratio results were in the order of Cu>Pb>C...

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