نتایج جستجو برای: pre concentration
تعداد نتایج: 682077 فیلتر نتایج به سال:
The first publication on the use of polyurethane foam (PUF) for sorption processes dates back to 1970, and soon after the material was applied for separation processes. The application of PUF as a sorbent for solid phase extraction of inorganic analytes for separation and pre-concentration purposes is reviewed. The physical and chemical characteristics of PUF (polyether and polyester type) are ...
The paper describes the development of an automatic on-line column pre-concentration technique using a time based-flow injection atomic absorption spectrometry system. A manifold incorporating a micro-column containing 25 mg of Dowex 50W-X8 was used with a time-based injector for the pre-concentration and determination of copper in natural and drinking waters. The system features depend on the ...
We examined the efficacy of a simple primary screening procedure for detecting beta- and pre-beta-lipoprotein abnormalities in 3183 children, ages 5-14, residing in Bogalusa, Louisiana. This procedure is based on the ability of beta- and pre-beta-lipoproteins to form insoluble complexes with heparin in the presence of Ca2+; the turbidity produced by the reaction was considered as an index of th...
Effects of Ammonium Chloride Supplements on Serum Calcium Concentration in Pre-parturient Dairy Cows
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