Extraction of Arsenic with Copper from Biological Materials.
نویسندگان
چکیده
منابع مشابه
The Determination of Copper in Biological Materials.*
Many early workers detected copper in certain plants, but attached no significance to its occurrence. Bucholz (1) and Meissner (2) in 1816 were probably the first definitely to establish the presence of copper in plant life. Sarzeau (3), in 1830, found copper in numerous plants, and since then many workers have reported the occurrence of this element, but most of them, as reviewed by Chevreul (...
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The abilities of various extractants to recover four arsenic species [As(iii), As(v), dimethylarsinic acid (DMA), and monomethylarsonic acid (MMA)] from soils spiked with 20 micro g g(-1) As were investigated. The extractants were water, buffer solutions (citrate and ammonium dihydrogen phosphate), acidic solutions (phosphoric acid and acetic acid), a basic solution (sodium hydroxide) and house...
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A method for the determination of the copper content of biological materials by flame spectrophotometry is described. The effects of interference by ions such as sodium and phosphate were eliminated by isolating copper as the dithizonate in CCl(4). Results obtained for the urinary excretion of copper by a patient with Wilson's disease before and after treatment with penicillamine are reported.
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آنزیم تریپسین در شرایط قلیایی ناپایدار می باشد .و فعالیت پروتئولیتیکی تریپسین منجربه خود هضمی آن در جایگاههای خاصی می گردد. بنابر این آنزیمی با ناپایداری بالا محسوب میگردد. در سالهای اخیر موفق شدند که با ایجاد تغیرات شیمیایی با اضافه کردن فلزات خاص ، کلسیم و یا عمل استیلاسیون منجر به افزایش پایداری آنزیم تریپسین گردند. مطالعات در حال حاضر نشان می دهد که تریپسین استیله شده فعالیت آنزیمی خود را ...
15 صفحه اولA Laboratory Study of Removing Arsenic from a Synthetic Copper Concentrate
Arsenic is the 20th most abundant element in the earth's crust at a level of about 2 ppm. It is a constituent of over 300 minerals and is commonly found in non-ferrous ores such as copper, lead, zinc, gold and uranium. Efficient separation of arsenic minerals from other sulphide minerals is of great importance for the metallurgical performance of flotation processes. This work was undertaken to...
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ژورنال
عنوان ژورنال: Chemical and Pharmaceutical Bulletin
سال: 1961
ISSN: 0009-2363,1347-5223
DOI: 10.1248/cpb.9.22