Xem 1-18 trên 18 kết quả Trace metals
  • Table 71-2 Deficiencies and Toxicities of Metals Element Deficiency Toxicity Tolerable Upper (Dietary) Intake Level Boron No biologic Developmental defects, male 20 mg/d function determined sterility, (extrapolated from data) animal testicular atrophy Calcium Reduced bone Renal insufficiency (milk-alkalai syndrome), mg/d 2500 (milk- Element Deficiency Toxicity Tolerable Upper (Dietary) Intake Level mass, osteoporosis nephrolithiasis, iron absorption impaired alkalai) Copper Anemia, growth retardation, keratinization Nausea, vomiting, 10 mg/d defective dia...

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  • Written by a multidisciplinary group of scientists from around the globe Environmental Restoration of Metals-Contaminated Soils provides a summary of the current environmental remediation technology.

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  • The generation of wastes as a result of human activities has been continuously speeding up since the beginning of the industrial revolution. Hence, both optimized waste water treatment technologies and modern tools to assess the effects of pollution sources are necessary to prevent the contamination of aquatic ecosystems The book offers an interdisciplinary collection of topics concerning waste water treatment technologies, water quality monitoring and evaluation of waste water impact on natural environments.

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  • At its inception, the original plan for this symposium was to emphasize the medical aspects of inorganic chemistry, rather than to go over once more new developments in bioinorganic chemistry, important as the subject is, since the latter topic has been treated many times in recent symposia reviews and monographs.

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  • Giảm / Mô hình trao đổi cation của phát hành trùng của kim loại Mangan và Trace sau giảm đất Hiệu quả của việc giảm đất vào tính hòa tan kim loại dấu vết có ý nghĩa quan trọng đối với cả hai sẵn sàng thực vật và độc tính, và vận chuyển hóa chất. Việc phát hành của kim loại kết hợp với Mn và Fe oxit sau giải thể giản lược quan trọng một cơ chế có khả năng có thể làm tăng nồng độ hòa tan của kim loại.

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  • In many European countries incineration is used as an important means of waste disposal in urban areas. The proportion of waste disposal by this route varies across Europe, from 13% in Italy to 53% in Switzerland, with an average value of 20 %. However, in some countries (for example, Portugal, Spain) the use of incineration is not used or is under consiration as a new option for waste disposal. Two main types of pollutants (combustion gases and fly ash) are emitted from incinerators.

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  • Environmental pollution has played a critical role in human lives since the early history of the nomadic tribes. During the last millennium, industrial revolution, increased population growth and urbanization have been the major determinants in shaping our environmental quality. Initially primary air pollutants such as sulfur dioxide and particulate matter were of concern. For example, the killer fog of London in 1952 resulted in significant numbers of human fatality leading to major air pollution control measures....

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  • Th i s book wi 11 be of great interest to anyone concerned with animal feeds and feeding programs whether one is studying bovine, porcine, equine, avian or lower vertebrate (fish and eel) nutrition. This information is critical to the success of an animal feeding program. Somet imes the di fference between a successful and a failing program can be traced to mineral deficiencies which cause either abnormal growth, reduced milk production, interrupted fertility and breeding, compromised immune system integrity and/or decrement in normal hemoglobin concentration.

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  • Tuyển tập các báo cáo nghiên cứu khoa học ngành y học tạp chí Medical Sciences dành cho các bạn sinh viên ngành y tham khảo đề tài: Trace Elements, Heavy Metals and Vitamin Levels in Patients with Coronary Artery Disease....

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  • Using chemical ionization mass spectrometry and photo- acoustic spectroscopy, we analysed the evolution of vola- tile organic compounds (VOCs) and other trace gases dur- ing an approximately one-week measurement period each in a pigsty and a sheep shed at the Federal Agricultural Research Centre (FAL) in Mariensee, Germany. When ac- tivities in the sheep shed were most intense during feeding hours and manure removal, concentration surges of VOCs were observed, which strongly correlated with methane and ammonia levels.

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  • Chelators: Chelated iron and other chelated nutrients are used when a direct dose of a particular nutrient is needed to quickly solve a deficiency. Chelated products are organic compounds with attached inorganic metal molecules, which are more available for plant use. Compost, humus, humic acid, and microorganisms have natural chelating properties. Chemically, lime is the oxide of calcium, with the formula CaO. It occurs in limestone, marble, and chalk as calcium carbonate. Finely ground limestone is the best form to use because it will be more available to plants.

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  • This article reviews methods for the determination and identification of trace elements in wine by using atomic absorption spectrometry (AAS). Wine is one of the most widely consumed beverages and strict analytical control of trace elements content is required during the whole process of wine production from grape to the final product.

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  • 11 Halogens, Sulfur, Metals, and Metalloids specific trace elements. A thorough, updated review of the scientific literature is recommended for project design. A number of substances are considered measures of water quality, but are seldom of concern as pollutants to be treated in constructed wetlands. These include common metals (e.g., sodium, potassium, calcium, and magnesium) as well as halogens (e.g., fluorine, chlorine, bromine, and iodine). Together with sulfate, these compounds often dominate the total ion content of natural waters and wastewaters.

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  • T.E. traces are conventionally drawn with positive metal giving an upward movement but when testing experimentally the results can correspond to positive metal either way so it is advisable to check polarity. In the metrology lab this can simplest be done by passing a piece of paper or hair though the mesh.

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  • Trace Mineral Intake Zinc 2.5–4 mg/d, an additional 10–15 mg/d per L of stool or ileostomy output Copper 0.5–1.5 mg/d, possibility of retention in biliary tract obstruction Manganese 0.1–0.

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  • Mining wastes can cause significant ecological destruction. Often, solid mine wastes are dumped into streams, destroying habitat and causing siltation and heavy metal and other contamination. Even when such wastes are stored out of water channels, trace materials can leach into surface waters and infiltrate into local groundwater. Fine- grained tailings can wash into local waterways and degrade streams by covering and filling coarser-grained substrates.

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  • The residence time that contaminants and nutrients remain in lichen tissue differs among elements (Pucket 1985). Macronutrients, such as nitrogen, sulfur, potassium, magnesium and calcium are comparatively mobile and easily leached and therefore measurable changes in tissue concentrations can occur over weeks or months with seasonal changes in deposition (Boongaprob et al. 1989). In one study, mobile elements reached the same levels in transplants as the indigenous lichens within four to six months (Palomäki et al. 1992).

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  • Mercury is thought to be one of the first metals used by humans. Historical records provide evidence of mercury use by ancient Chinese and Hindu civilizations. Archaeologists have also found traces of mercury in an Egyptian tomb dating from 1500 BC and in the writing of a Chinese alchemist around 4500 BC. Both the Egyptians and Chinese may have been using the mercury ore, cinnabar, as a pigment to paint their tombs, anoint their statues and even preserve their dead. Many civilizations believed mercury had mystical properties and the power to prolong life.

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