mercury analysis Articles
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Mercury Analysis
Characteristics of Mercury What is Mercury? Mercury is a naturally occurring silver-colored metallic element noted for its occurrence as a liquid at room temperature and toxic to living organisms. This silvery, opaque liquid metal is very dense, yet has a high surface tension that causes it to form tiny perfect spheres in the pores of the rocks it is found in. It is designated with the chemical ...
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Best wishes for the New 2017 Year from Lumex Instruments
The end of the year is always a good time to sum up all the results. Thanks to joint efforts in 2016, we improved the quality of our work, uploaded the products line and entered the new markets. Here is a brief overview of our activity during this year: New developments: Atomic Absorption Spectrometer MGA-1000; Exhibitions and conferences worldwide: ARABLAB 2016 International Trade Show, ...
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The largest source of anthropogenic mercury emissions
The artisanal and small-scale gold mining (ASGM) is practiced in at least a dozen countries in Latin America. These industries are the largest source of anthropogenic mercury emissions which pollute the air, soil, and water and lead to severe problems with the human health. Therefore, mercury contamination has to be monitored and eliminated. We present you a whitepaper which outlines: What is ...
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What are CVAA Mercury Analyzers Systems?
In a previous blog post, we wrote about Cold Vapor Atomic Absorption Spectroscopy, a primary technique for mercury analysis. In this post, we will describe Teledyne Leeman Labs’ instruments that facilitate the process. Leeman Labs offers two CVAA systems; the Hydra IIAA, an entry-level CVAA system that can detect mercury limits of less than 5.0 ng/L with a usable range of 5 ng/L to 1 mg/L; ...
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Surface Decontamination of Mercury (elemental) by DeconGel 1101
Abstract Surface decontamination efficacy determination of DeconGel™ 1101 on stainless steel, porcelain tile, composite tile (unwaxed), linoleum tile, and concrete surfaces contaminated with mercury (elemental) was performed with Mercury Vapor Analysis Sensor (Mercury Tracker 3000) according to Environmental Protection Agency (EPA) SW-846 Method: 7471B: "Mercury in Solid or Semisolid Waste ...
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Solvent-Free Synthesis of c-Axis Oriented ZSM-5 Crystals with Enhanced Methanol to Gasoline Catalytic Activity
ZSM-5 crystals with controllable c-axis length were successfully synthesized through a one-pot solvent-free route, with urea as an additive. X-ray diffraction patterns (XRD) show that the prepared samples exhibit high crystallinity. N2 adsorption–desorption isotherms and mercury intrusion porosimetry (MIP) analysis together with TEM observations indicate that micro-, meso-, and macropores ...
By SusChem
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Characteristics of successful gazelles - problems in approaches and methods of analysing the data
This paper focuses on the problems of analysing growth and success of a firm. The data consists of 348 growing SMEs. 75 of them were growing rapidly and highly successful (HGS). The methods include discriminant, regression and logistic regression analysis. In regression models, growth and success seem to be inversely related. Regression analysis is not an appropriate way to analyse HGS firms. ...
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The application of Flow Injection Technology to automating cold vapor MERCURY analyses
This document describes the application of flow injection technology to cold vapor mercury analyses. It can be obtained from PerkinElmer by requesting method number ENVA-100. Appendices 1 and 2 show letters from the US EPA indicating acceptability through the Alternate Test Program for both drinking water and wastewater sample analysis. 1.0 Scope and Application 1.1 This method measures total ...
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A Novel Approach to Increase Sample Throughput on a CVAA Mercury Analyzer using an Injection Valve
ABSTRACT Mercury determination in soil plays a crucial role in agri‐ culture, environmental status, and human health. The de‐ tection of mercury allows for long‐term and short‐term analysis of each of these systems, and it gives information on specific sources of mercury contamination. The analysis of soil yields quantitative data for water quality, air quali‐ ty, ...
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The use of novel biomarkers to determine dietary mercury accumulation in nestling waterbirds
Mercury (Hg) depuration into growing feathers is a well‐studied phenomenon in waterbirds. Although the kinetics of Hg excretion in relation to molt and diet has been studied extensively, the relationship between the individual nutritional condition of nestlings and dietary Hg accumulation has not been investigated. In the present study, a body‐condition index (BCI) and nutritional condition index ...
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Hepatic and nephric mercury and selenium concentrations in common mergansers Mergus merganser from Baltic Region, Europe
Mercury (Hg) and selenium (Se) concentrations and their relationships in wild aquatic vertebrates have been investigated in areas with appropriate or excessive Se levels, mainly in North America. Generally, total mercury (THg) is determined in biota, although piscivorous vertebrates are most affected by dietborne methylmercury (MeHg). Mercury detoxification is based largely on production of ...
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Column studies to determine mercury settling in road runoff
A study was performed using a settling column to remove mercury (Hg) from road runoff. The emphasis was placed on the relationship between Hg removal and critical settling velocities, as well as the distribution of total suspended solids (TSS). The impact of rainfall characteristics and temperature on Hg removal was also discussed. Results indicated that Hg removal was significant within the ...
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Factors Influencing Mercury in Freshwater Surface Sediments of Northeastern North America
We report on an inventory and analysis of sediment mercury (Hg) concentrations from 579 sites across northeastern North America. Sediment Hg concentrations ranged from the limit of detection ca. 0.01–3.7 g g–1 (dry weight, d.w.), and the average concentration was 0.19 g g–1 (d.w.) Sediment methylmercury concentrations ranged from 0.15 to 21 ng g–1 (d.w.) and the mean concentration was 3.83 ng g–1 ...
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Analysis of potential mercury policies: The impact of stream basin characteristics on susceptible populations
Human exposure to mercury through fish consumption from local waterways is an ongoing concern to regulatory decision makers. Previously described population exposure and bioaccumulation models were combined in order to analyze the impact of potential policies on susceptible populations. The combined model simulated the problem of mercury exposure by examining the system from the point of ...
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Evaluation of two in vitro protocols for determination of mercury bioaccessibility: influence of mercury fractionation and soil properties
Received for publication November 10, 2008. Soil ingestion by children can be a significant exposure pathway to mercury (Hg). Unfortunately, no reliable in vivo results for Hg oral bioavailability determination in soils have been published. In vitro extractions enable the assessment of metals' bioaccessibility, which is an estimate of oral bioavailability. Therefore, the goal of this study was to ...
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FAQ Corner - Units for Vacuum Measurement
Earlier this year, the applications engineers here at Teledyne Hastings discussed topics for our blog. We all agreed that one of the more frequent questions that we discuss with folks involve the units used to measure vacuum levels. We find the technicians who use their vacuum systems daily often seem to develop a sixth sense about the “health” of their systems. They know something ...
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Saltwater flotation for more efficient matrix separation of wetland macroinvertebrates does not affect total mercury or methylmercury concentrations
We compared benthic wetland invertebrate matrix separation techniques (handpicking vs. saltwater flotation) to test for effects on invertebrate mercury concentrations. Neither total mercury nor methylmercury concentrations differed significantly between techniques across eight taxa. Matrix separation by the flotation technique took significantly less time and resulted in significantly greater ...
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Habitat‐specific foraging and sex determine mercury concentations in sympatric benthic and limnetic ecotypes of threespine stickleback
Mercury (Hg) is a widespread environmental contaminant known for the neurotoxicity of the methylated forms, especially monomethyl mercury, which bioaccumulates and biomagnifies in aquatic food webs. Mercury bioaccumulation and biomagnification rates are known to vary among species utilizing different food webs (benthic versus limnetic) within and between systems. We assessed if carbon and ...
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Optimization of adsorption process parameters by response surface methodology for hexavalent chromium removal from aqueous solutions using Annona reticulata Linn peel microparticles
Fruit peel microparticles of Annona reticulata Linn were used as biosorbent for the sequestration of hexavalent chromium (CR(VI)). Characterization of the biosorbent was done using scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDXS), Fourier transfer infrared spectroscopy (FTIR), gas chromatography-mass spectrometry (GCMS), carbon, hydrogen, nitrogen and sulphur ...
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Mercury in Northeastern North America: A synthesis of Existing Databases
A large number of datasets representing mercury (Hg) levels in northeastern North America were assembled in a standardized format between 2000 and 2003. Based on support from the Northeastern States Research Cooperative, scientists annually gathered and developed an operational template to collaboratively analyze and interpret these data for a series of peer-reviewed publications. The diverse ...
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