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	Trace metal - Wikipedia, the free encyclopedia
		Trace metals are metals in extremely small quantities, almost at the molecular level, that reside in or are present in animal and plant cells and tissue.
		Trace metals are depleted through the expenditure of energy by a living organism.
		Trace metals are sometimes referred to as trace elements, though the latter is a broader category.
	en.wikipedia.org /wiki/Trace_metal (141 words)

	Student Research, Marine Science, Otago University , New Zealand
		Factors which were investigated include the distribution of metals in the various organs of paua, and the differences in metal levels between the sexes and species of paua.
		Spatial variation of metal levels was investigated in the foot of the paua, and temporal variation was investigated in three different organs of paua.
		Trace metals in paua and seaweeds were analysed by freeze drying, acid digesting in concentrated aqua-regia, and placing the samples in a muffle furnace at 450 °C for 24 hrs.
	www.otago.ac.nz /marinescience/research/Abstracts/mcech_abs.htm (407 words)

	Patent 5546182: Method for determination of trace metal impurity in fluorine-containing polymer and process for ...
		The metal of a trace amount contained in the fluorine-containing polymer which can be quantitatively determined by the method according to the present invention is not specifically limited, and it includes any metal which is generally quantitatively determined by means of the flameless atomic absorption spectrophotometer.
		In the present invention, the term "trace (amount)" is used to mean that a concentration-of the order of "ppm" or less, for example, a concentration of the order of a "ppb" is determined, but it does not mean that a metal concentration which is higher than such a low concentration cannot be determined.
		In such a condition, the materials in addition to the metals still remain up to the atomizing step of the atomic absorption spectrophotometry and such materials are decomposed at once during the atomizing step so that a phenomenon is observed on the spectrophotometry measurement as if a large amount of metals were present.
	www.freepatentsonline.com /5546182.html (4961 words)

	Trace metal (Site not responding. Last check: 2007-11-06)
		Trace metal s are metal s in extremely small quantities, almost at the molecular level, that reside in or are present in animal and plant cells and tissue.
		Trace metal s are depleted through the expenditure of energy by a living organism.
		Trace metal s are sometimes referred to as trace elements, though the latter is a broader category.
	www.portaljuice.com /trace_metal.html (135 words)

	National Water Quality Assessment ( (Site not responding. Last check: 2007-11-06)
		Trace elements and select major elements were analyzed in whole water samples and in filtered water samples.
		Metal concentrations in colloids, and colloid and suspended sediment concentrations were measured as part of this study.
		Sequential extractions of metals in colloids were completed to determine what potential solid phases the trace metals might be associated with and to determine the relative strength of binding of various metals within the colloids.
	ca.water.usgs.gov /sac_nawqa/sacmetals.html (674 words)

	ABSTRACT: Role of sediment composition in trace metal distribution in lake sediments. (Site not responding. Last check: 2007-11-06)
		Sediment cores were collected from 20 lakes from the Muskoka region of Ontario, Canada, to study vertical changes in trace metal concentrations with depth and the distribution of metals amongst humic material, amorphous and crystalline Fe and Mn oxides, insoluble organics/sulphides, and silicates.
		The speciation study revealed that metals of the latter group were mainly associated with thesilicate fraction in both surface and deep sediments.
		This study shows that relative affinities for organic and mineral fractions play an important role in the distribution of trace metals during burial and diagenesis, and hence in the shape of their vertical profiles.
	cgrg.geog.uvic.ca /abstracts/ElRoleSediment.html (254 words)

	Low cost trace metal analyses: News from Metrohm UK
		Trace metal analyses can be carried out with the same or better sensitivity for a fraction of the cost of an AAS or ICP instrument.
		Apart from the determination of the total concentration, which is normally obtained with spectroscopic methods, voltammetry allows you to distinguish the different oxidation stages of metal ions or differentiate between free and bound metal ions as well as to specify the biological availability of heavy metals.
		The main advantages of Voltammetric trace analysis are: it has extremely low detection limits: it has no problems with high salt concentrations; it allows speciation; it differentiates between free and complexed metal ions; it can also analyse non-metals such as anions or organics.
	www.processingtalk.com /news/met/met119.html (402 words)

	THE EFFECTS OF MULTIPLE STRESSORS ON ESTUARINE ECOSYSTEMS: THE RELATIONSHIP BETWEEN NUTRIENT LEVELS AND TRACE METAL ... (Site not responding. Last check: 2007-11-06)
		The ecosystems were exposed to elevated levels of nutrients and trace metals, both separately and in combination.
		Dissolved and particulate metal and nutrients concentrations were analyzed periodically during the experiments, and As, Cd, and Cu levels in clams (Macoma balthica), oysters (Crassostrea virginica) and Mummichogs (Fundulus heteroclitus) were examined at the end of the experiments.
		In general, nutrient levels within the mesocosms greatly affected trace metal uptake by bivalves, but had a lesser affect on trace metal levels in fish.
	www.aslo.org /santafe99/abstracts/SS28FR0445S.html (229 words)

	Encyclopedia of Nursing and Allied Health: Trace metal tests
		Trace metals are a group of metals that include both heavy and transitional elements present in submilligram quantities in the blood.
		Trace metal tests are required when the patient has symptoms of toxicity or when the patient is in a high risk category for environmental exposure to a toxic metal.
		Metals are present in the materials used to manufacture rubber stoppers and lubricants used in blood collection tubes.
	www.findarticles.com /p/articles/mi_gGENH/is_/ai_2699003799 (1349 words)

	AMBIENT WATER QUALITY CRITERIA FOR SILVER
		Estimating bioavailability of sediment-bound trace metals with chemical extractants.
		Effects of metals on the behavior and oxygen consumption of the mud snail.
		Trace metals in rivers-speciation, transport and role of sediments.
	wlapwww.gov.bc.ca /wat/wq/BCguidelines/silver/bcsilver-44.htm (3063 words)

	Genetic trace metal disturbances -- Chan and Rennert 4 (1): 39 -- Journal of the American College of Nutrition
		metal disturbances affect the metabolic pathway of the trace metal itself.
		Trace metal disturbances can also be the result of other genetic diseases.
		This aspect of genetic trace metal disturbances is least investigated.
	www.jacn.org /cgi/content/abstract/4/1/39 (176 words)

	Trace metal digestion unit by Gerhardt (Site not responding. Last check: 2007-11-06)
		As these highly poisonous trace metals can also get into the human food via plants and animals, the analysis of trace metal is of significant importance.
		The trace metal digestion systems SMA use the CSB/COD-digestion systems CSB 8 A and CSB 20 A with motor-driven two-tier console.
		In addition the trace metal system has trace metal cooling traps on the top of the condensers on top of which can be placed a PVC exhaust manifold for fume removal.
	www.gerhardt.de /eng/smae.htm (189 words)

	Dr. Senn
		Trace minerals in the fulvic acid electrolyte could also be beneficial in this process by serving as electrode.
		Fulvic acid organic metal complexes are of a low molecular weight,25 low molecular size, and are capable of a high degree of penetration into cells.
		It has been shown that these interactions may increase the concentrations of metal ions and silica found in water solutions to levels that are far in excess of their assumed dissolution ability.
	www.richearth.net /Dr_Senn.htm (2813 words)

	Trace Metal Determination in River Water by diffusion Gradients in Thin Films/, Mohammad Reza Sangi; Supervised by: ... (Site not responding. Last check: 2007-11-06)
		Trace Metal Determination in River Water by diffusion Gradients in Thin Films/, Mohammad Reza Sangi; Supervised by: Keith A Hunter.
		To investigate the chemical and physical parameters that affect the amount of metal absorbed by DGT devices, by conducting laboratory experiments under controlled conditions (Chapter 2 and 3).
		To investigate the effect of chemical speciation on the uptake of trace metal inos by DGT devices (Chapter 4).
	dbase.irandoc.ac.ir /00232/00232415.htm (208 words)

	Zoryn @ Foresinc - Trace Metal Detection Kit
		When an individual handles metal objects or weapons, trace amounts of the metal are deposited on his or her hands.
		Simply spray the trace metal detection solution on the suspect’s hands, then illuminate the area with the short wave UV lamp to make the trace metal visible.
		This reagent is sprayed on the suspect’s hands and then examined under short wave ultraviolet light for telltale traces of a metal tool or weapon.
	www.zoryn.com /~forensic/Trace%20Metal%20Detection%20Kit.html (149 words)

	Trace Metal Mobilization in Soil by Bacterial Polymers
		Enhanced transport of trace metal in porous media can occur in the presence of a ligand or "carrier" that has a high affinity for binding the pollutant, is dispersed and mobile in the soil environment, is recalcitrant with respect to microbial degradation, and is acceptable to the public.
		These aspects of the facilitated transport to trace metals are discussed with respect to a naturally occurring carrier: extracellular polymers of bacterial origin.
		These properties and the supporting model calculations indicate that extracellular polymers of bacterial origin merit consideration as agents that may be applied to contaminated soils to enhance trace metal mobility.
	ehpnet1.niehs.nih.gov /docs/1995/Suppl-1/chen.html (274 words)

	TRACE METAL MOBILITY/SEDIMENT MATURITY IN BLACK SHALES DERIVED FROM VARIATIONS OF CARBON PROXY VALUES: V, Mo, Zn (Site not responding. Last check: 2007-11-06)
		Considering that each metal presumably shows differential mobility as a function of mineralogy, anion availability, redox conditions etc. even under the same environmental conditions, this is not surprising.
		Also, estimates for the original organic carbon differ when regression equations for different metals from the same data set are applied to other sample suites.
		This approach should be used to span the greatest possible environmental variation over geologic time in order to assess both the relative mobility of the metal and the degree of thermal maturation of sediment during carbon transport.
	www.marscigrp.org /gsa03.html (354 words)

	ABSTRACTS 1996
		Samples were analyzed separately for trace elements dissolved in water (less than 0.4 micrometer in diameter) and for those contained in suspended sediment (greater than 0.1 micrometer in diameter).
		The route of trace element uptake (food vs dissolved) and the duration of exposure to dissolved trace elements (12 h vs 6 d) did not significantly influence trace element efflux rates.
		For all metals, concentrations in mussels are proportionately related to total metal lead in the water column and their assimilation efficiency from ingested particles.
	water.usgs.gov /nrp/proj.bib/abstracts.96.html (17257 words)

	Boyle - Marine Trace Metal Geochemistry (Site not responding. Last check: 2007-11-06)
		Rationale: This work aims to use the isotopic variability of trace metals to understand mechanisms controlling the fluxes of metals through the ocean and their links to biogeochemical processes.
		Oceanic trace metal isotope variability is caused by (a) radiogenic isotope differences due to varying geological and anthropogenic sources (e.g., Pb isotopes), (b) stable isotope differences created by equilibrium, kinetic, and biological fractionations (e.g.
		Methodology: Trace metal clean sampling methods are required at sea; in the laboratory, chemical purification methods and multiple-collector plasma mass spectrometry are used to measure metal isotope ratios.
	www.whoi.edu /education/gsp/MCG/Boyle_tracemetal.htm (291 words)

	Publications of the Wood Hole Research Center, 1999 - 2001
		Ecosystem modeling and dynamic effects of deforestation on trace gas fluxes in Amazon tropical forests.
		Trace metal loss following whole-tree harvest of a northeastern deciduous forest, U.S.A. Biogeochemistry 54:197-217.
		Biogeochemical impact of Hieracium invasion in New Zealand's grazed tussock grasslands: sustainability implications.
	www.whrc.org /resources/published_literature/1999-2001.htm (2301 words)

	McKenzie, Brown, Cady and Campbell (2001) Trace metal chemistry and silicification of microorganisms in geothermal ... (Site not responding. Last check: 2007-11-06)
		As part of a pilot study investigating the role of microorganisms in the immobilisation of As, Sb, B, Tl and Hg, the inorganic geochemistry of seven different active sinter deposits and their contact fluids were characterised.
		The extractions showed whether metals were loosely exchangeable or bound to carbonate, oxide, organic or crystalline fractions.
		Although high concentrations of Hg and Tl were found associated with the organic fraction of the sinters, there was no evidence to suggest that any of the heavy metals were associated preferentially with the hyperthermophiles at the high temperature (92—94°C) ends of the terrestrial thermal spring ecosystems studied.
	www.getcited.org /pub/103396229 (234 words)

	Trace Metal Sources for the Atlantic Inflow to the Mediterranean Sea - Storming Media
		Trace Metal Sources for the Atlantic Inflow to the Mediterranean Sea
		Trace metal and ancillary data for 172 samples from the Gulf of Cadiz collected in April and October '86 confirm that Spanish shelf water dominates Cu, Cd and Zn fluxes through the Strait of Gibraltar.
		A shelf 'metal-trap' mechanism is presented in order to reconcile the magnitude of observed metal enrichments with their geographical distribution and seasonal variability.
	www.stormingmedia.us /70/7068/A706812.html (341 words)

	Stordal, colliods in trace metal speciation; Villac, Pseudo-nitzschia diatoms in Monterey Bay California, Quarterdeck ...
		The bioavailability of trace elements in aquatic systems is not only determined by their concentrations but also the speciation, or chemical form of the element, that is present.
		The attachment or association of a trace element with these finer particles can affect the availability of the element to organisms as well as the distribution, transport, and removal of the element in the aquatic environment.
		Observations of trace element movement between the dissolved phase and the particulate phase in natural aquatic environments does not always follow what is predicted from laboratory observations.
	www-ocean.tamu.edu /Quarterdeck/QD4.2/recentgrads-4.2.html (1129 words)

	Moffett - Trace Metal
		Trace metal geochemistry and phytoplankton blooms in the Iceland and Greenland Seas
		A thesis project in this area would involve: measurement of metal distributions in the region; incubation experiments to look for Fe limitation of primary production; comparison of field data with coccolithophore culture work to see if changes in metal regime influence the shift from diatom to coccolithophore dominated regimes.
		To obtain basic information about the study site, we would measure the concentrations of metals in seawater, and study their redox chemistry and complexation by organic ligands using inductively-coupled plasma mass spectrometry (ICP-MS) and polarography.
	www.whoi.edu /education/gsp/MCG/Moffett_tracemetal.htm (534 words)

	Goldschmidt 2OO2, Symposia
		Among likely topics are phenocryst/xenocryst geochronology, isotopic and trace element stratigraphy of zoned crystals, crystal nucleation and growth kinetics, separation of melt from crystals, magma reservoir/chamber dynamics, role of volatile components, and eruptive or intrusive chronologies of natural systems.
		It is increasingly recognized that the bioavailability and mobility of pollutants, trace elements, radionuclides and micronutrients are influenced by the inherent heterogeneity of earth materials on the nanometer to micron scale.
		The isotope and elemental compositions of accretionary skeletons (fish otoliths, corals, shells of molluscs and terrestrial snails, speleotherms and foraminifera) are used as tracers in such broad applications as identification of natal spawning grounds, estimation of paleotemperatures and tracing volcanic eruptions on the ocean floor.
	www.goldschmidt-conference.com /2002/gold2002s/symp.html (8008 words)

	TOXICITY OF MINE-WASTE LEACHATES TO AQUATIC ORGANISMS AS A FUNCTION OF PH AND TRACE-METAL CONCENTRATIONS (Site not responding. Last check: 2007-11-06)
		These precipitates may attenuate trace metals as they migrate from their source through ground- and surface-water systems, thereby reducing the bioavailability of the metals.
		We examined the acute toxicity of metals in mine-waste leachates to aquatic organisms as a function of pH and metal concentrations.
		Based on acute toxicity tests at low pH without metals present, some of the toxic effects appear to be due to pH, but additional toxic effects were observed at low pH in the presence of dissolved metals.
	gsa.confex.com /gsa/2002AM/finalprogram/abstract_43889.htm (483 words)

	Nutrient and trace metal distributions over a complete semi-diurnal tidal cycle in the Forth Estuary, Scotland. (Site not responding. Last check: 2007-11-06)
		Nutrient and trace metal distributions over a complete semi-diurnal tidal cycle in the Forth Estuary, Scotland.
		The distribution of dissolved trace metals and nutrients has been examined during a complete 12.5 hour tidal cycle at an anchor station in the turbid industrialized Forth estuary.
		This implies that manganese oxyhydroxides are an important phase for the transport of trace metals.
	www.cefas.co.uk /publications/files501-1000/647.htm (438 words)

	Millipore - Applications Bibliography - Guidance on Establishing Trace Metal Clean Rooms in Existing Facilities
		The basic requirements for a trace metal clean room are minimal.
		They include metal free work surfaces and hoods, positive pressure with HEPA-filtered air, and clean (18.3 Megohm.cm) water; Each of those requirements may be readily achieved with commercially available materials, and they may be easily installed within existing facilities at relatively little expense.
		Movement may be minimized by locating systems near the entrance to the clean room or within the change room, and by plumbing the water to a carboy with a spigot near the back of the laboratory.
	www.millipore.com /bibliography.nsf/docs/53SSDL (277 words)

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