2 edition of Some rocks and soils of high selenium content found in the catalog.
Some rocks and soils of high selenium content
Orville A. Beath
|Statement||by O. A. Beath, Arthur F. Hagner, [and] C. S. Gilbert.|
|Contributions||Hagner, Arthur Feodor, 1911- joint author., Gilbert, C. S., joint author.|
|LC Classifications||QE181 .A25 no. 36|
|The Physical Object|
|Number of Pages||23|
|LC Control Number||gs 47000251|
Foods rich in selenium include shellfish, crab, kidney, liver, and Brazil nuts. It is important to remember that selenium rich food is only so if it is grown or raised in a selenium rich environment. Brazil nuts, touted as one of the best sources of selenium, vary in selenium content, as some grow in selenium . Top 10 Books for Getting Started with Automation Testing Originally Published at - LambdaTest Are you looking for the top books for Automation Testers? Ah! That’s why you are here. When I hear the term book, This famous saying always spins up in m.
Link to US map showing selenium levels in soil. May. 9, , AM. Probably posted before but I came across this and thought y'all might find it useful. It's a link to a USGS map of the US showing the selenium levels in the soil (by county). Click on your state, then county. You'll see a table showing levels of various substances. In some cases, soils are frankly deficient in selenium—most particularly those derived from igneous rocks, and the deficiency in surface layers may be aggravated by intensive irrigation. Alternatively, soil selenium may exist in a form that is either unavailable to plants or absorbed by them with difficulty.
High selenium foods can grow only in the soil rich in selenium, just like magnesium levels in foods also depend on the soil composition.. Selenium enters life on the surface of our planet from deep underground with the ashfall of the volcano eruptions and with the erosion of rocks containing selenites. Element concentrations in soils and other surficial materialsof the conterminous United States. Northwest generally have high concentrations of aluminum, cobalt, iron, scandium, and vanadium, but are low in boron. book of agriculture was devoted to reports on soils of the United States; in this book, McMurtrey and Robin- son (
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Additional Physical Format: Online version: Beath, Orville A. (Orville Andrew), Some rocks and soils of high selenium content. Laramie, Univ.
of Wyoming, Some rocks and soils of high selenium content [Orville A. Hagner, Arthur Feodor, ; Gilbert, C. S., Beath] on *FREE* shipping on qualifying : Beath, Orville A.
Hagner, Arthur Feodor, ; Gilbert, C. High selenium concentrations may be found in volcanic rock ( μg/g) but also in sedimentary rocks such as in shales, sandstone uranium deposits ( μg/g), and in some carbonate rocks (30 μg/g). The selenium content of coal and oil may vary from – μg/g and from – μg/g, respectively (Raptis, ), but coal levels of.
Selenium in Rocks, Soils, and Plants Alvin L. M Factors Determining the Selenium Content of Soils. 68 Factors Influencing the Availability of Selenium to Plants and Ab- Early in the twentieth century some interest was shown in the pharmacological action of selenium as a Cited by: The total selenium content of many toxic seleniferous soils is appreciably lower than that of some nontoxic soils.
Because of the high levels of selenium in sedimentary rocks and the importance of such rocks as soil-forming materials, the processes contributing to high selenium concentrations are of interest. Selenium contents were analyzed from a total of soil samples collected over different rock types at a sampling density of one sample per 4 km2 around Geita gold mining areas, Northwestern Tanzania.
Comparisons using literature survey contents of selenium in geological materials and some implications on the selenium in soils are compiled and by: SELENIUM IN SOIL Selenium content in soil is highly variable.
It varies from to 2 gSe g—1 in most soils, but it is most frequently between and gg—1 (McNeal and Balistrieri,).
Some soils are low in selenium, from to gg—1 (NAS, ). Toxic concentrations occur in arid and. Colorado, and New Mexico tend to have high selenium values ranging from'2 to 10 ppm. Low-selenium soils include those derived from sedimentary rocks that predate the major cretaceous period, like those in the north-eastern United States.' Other low-selenium soils include those in the Pacific Northwest that are formed from recent volcanic ash de-File Size: KB.
Selenium is a naturally occurring trace element that is essential for animal nutrition, but the range between dietary requirements and toxic levels is relatively narrow. The greatest abundance of Se is in igneous rocks (although bioavailability may be low), but high concentrations are found in some sedimentary rocks and fossil fuels.
SELENIUM CONTENT OF SOME VOLCANIC ROCKS FROM WESTERN UNITED STATES AND HAWAIIAN ISLANDS By D. DAVIDSON, and H. POWERS ABSTRACT Eighty-one analyses for selenium of volcanic rocks from southern Alaska, the Aleutian Islands, the Hawaiian Islands, and several Western States have been madeCited by: The selenium content of plants in most soils is less than 1 mg/kg plant dry weight, whereas most plants grown in seleniferous soils show selenium levels in the range of 1 to 10 mg/kg plant dry weight.
In the case of Se-hyperaccumulator plants, this can increase to between to 15, mg/ by: Application of the P-buffer to soils resulted in a low recovery of selenium ( %) when compared to the total selenium content of the respective soils.
The total selenium was determined after. Most Americans get enough selenium from their diet because they eat food grown or raised in many different areas, including areas with soil that is rich in selenium.
Selenium Fact Sheet for Consumers Many foods have selenium, including seafood, File Size: KB. Selenium minerals are rare, and although selenium-rich ores exist, few are mined exclusively for the element.
Most selenium is obtained as a by-product of copper ore processing. Selenium is occasionally found in pure form. It occurs in the rare minerals clausthalite and crooksite. Despite the name, the mineral selenite actually contains no. High contents of Se (> 5 mg/kg) in soils were calculated in countries like Canada, Germany, France and some areas of western USA, whereas, very low Se levels.
Selenium is typically low on acidic soils and in high rainfall areas. If your soil contains selenium at a concentration greater than mg/kg, it would be a good idea to investigate the reason why.
It would also be advisable to have some plant tissue from edible plants grown in your garden analysed and to then seek expert advice about any. tities of selenium, but not all such areas are seriously affected; the Cretaceous shales of California and the Cretaceous beds of New Jer- sey and Maryland, for example, have been shown to be free of any widespread exposure of high selenium content (17).
3 Italic. Except for extremely sandy soils and some acidic peat soils, most soils will supply enough molybdenum for good plant growth if the pH is above 6. Soils that are derived from granite, shale, and young volcanic materials often have higher levels of molybdenum, and so.
Selenium leached from soil parent materials formed from these rocks reaches depressions filled by river flood plains and old lake-beds, and it is here that the most toxic soils occur. Selenium in these soils ranges from 5 to over mg/kg but the majority of toxic soils contain between 10 and 50 mg/kg.
Selenium Selenium is a trace mineral essential to good health. The major dietary source of selenium is plant foods. Selenium concentrations in plants generally relect the concentration of selenium in soils, but some meats and seafood can also contribute dietary selenium; in the United States, meats and bread are common Size: KB.
The overall relationships among the concentrations of selenium in rocks, soils, and plants have been summarized as follows (NRC, Where rocks with a high content of selenium decompose to form well- drained soils in subhumid areas (less than 8 cm of annual rainfall), the selenides and other insoluble forms of selenium will be converted.Selenium poisoning occurs in the areas that have soils high in selenium.
Both indicator and secondary selenium-accumulating plants grow in these areas. Astragalus bisulcatus, two-grooved milkvetch, is a selenium-accumulating plant.
Though it is not palatable to most livestock, it has been implicated in some cases of selenium toxicosis. UPDATE: See Richard's Comment below for more information about this El Dorado and its location (about miles south of where I found the prince's plume).
Sources (in addition to links in post) Beath, OA. Some rocks and soils of high selenium content.