منابع مشابه
Determination of bismuth in environmental samples by slurry sampling graphite furnace atomic absorption spectrometry using combined chemical modifiers
Slurry sampling graphite furnace atomic absorption spectrometry technique was applied for the determination of Bi in environmental samples. The study focused on the effect of Zr, Ti, Nb and W carbides, as permanent modifiers, on the Bi signal. Because of its highest thermal and chemical stability and ability to substantially increase Bi signal, NbC was chosen as the most effective modifier. The...
متن کاملMethods for Environmental Samples
The United States Environmental Protection Agency (EPA) requires the determination of important trace elements in a variety of environmental samples. Graphite furnace atomic absorption methods are recommended for some elements including As, Se, Cd, Pb, Tl, Sb, Ag, Be and Cr. Graphite furnace analyses can be difficult due to chemical and spectral interferences. Quantification in atomic absorptio...
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Purification and PCR amplification procedures for DNA extracted from environmental samples (soil, compost, and river sediment) were improved by introducing three modifications: precipitation of DNA with 5% polyethylene glycol 8000 (PEG) and 0.6 M NaCl; filtration with a Sepharose 4B–polyvinylpolypyrrolidone (PVPP) spin column; and addition of skim milk (0.3% w/v) to the PCR reaction solution. H...
متن کاملNatural and anthropogenic U in environmental samples
The interaction of thermal neutrons with U results in fission with a probability of 85% and in the formation of U (t1/2 = 2.3 10 yr) with a probability of 15%. While anthropogenic U is, therefore, present in spent nuclear fuel at levels of U/U up to 10 , the expected natural ratios in the pre-anthropogenic environment range from 10 14 to 10 . At VERA, systematic investigations suggest a detecti...
متن کاملSpeciation of Tin Compounds in Environmental Samples
Speciation, identification of the chemical states of elements in the environment, is indispensable in determining the environmental behavior, bioavailability, and the influence of elements on the quality of the environment. For speciation, X-ray absorption fine structure (XAFS) is a powerful tool, because it is a direct method by which we can avoid the change of the chemical state of target ele...
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ژورنال
عنوان ژورنال: RADIOISOTOPES
سال: 1985
ISSN: 1884-4111,0033-8303
DOI: 10.3769/radioisotopes.34.10_555