mercury in water Articles
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Determination of trace amounts of mercury (II) by catalytic kinetic method in environmental samples
A highly selective and sensitive, spectrophotometric method is developed for the determination of Mercury(II) in environmental waters samples, based on indicator reaction of potassium hexacyanoferrate(II) and 2-methylpyrazine (2-Mepz), catalysed by Hg(II). The reaction was monitored spectrophotometrically at pH = 3.50 ± 0.02 and 25.0 ± 0.1°C by measuring the change in absorbance over time at 447 ...
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Detecting Mercury in Water
Determination of Mercury (Hg) in Water by Hand-Held, Portable Cold Vapor Atomic Fluorescence SpectrometryWater is the most familiar and most abundant compound on Earth, making up 71% of its surface area.[1]It is a vital component for all known forms of life and is the aquatic habitat for thousands of species of microalgae, fish and shellfish. [2] With the presence of running water in our ...
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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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Distribution of mercury in the water and bottom sediment of the J.A. Alzate Dam, Mexico
In this paper, mercury concentration in the soluble, particulate and total fractions of water and in the sediment from the Jose Antonio Alzate Dam in the State of Mexico was evaluated using neutron activation analysis in order to determine the bioavailability and distribution of this metal. Sampling was carried out on three separate seasons – cold dry season, hot dry season and rainy season – ...
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Sulphate reducing bacteria to precipitate mercury after electrokinetic soil remediation
Combined treatment with electroremediation and sulphate reducing bacteria (SRB) was tested in laboratory and pilot scale. The contaminated soil came from a chlor-alkali factory and contained about 100 mg/kg Hg. Iodide/iodine complexing agent was used to mobilize mercury. Mercury iodide complexes were moved to the anode solution using an electric field. The anode solution was then mixed with ...
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Deforestation through agriculture and mining in French Guiana: impacts on mercury concentrations in water - Case Study
This study increases our knowledge of the quantities of mercury and methylmercury (MMHg) in water and of suspended matter in different contexts of disturbance of the soils, in French Guiana. The need Potential sources of mercury directly related to soils and sediments are both natural (leaf litter, sediments and colloids) and anthropogenic (mercury of historical and current anthropogenic origin ...
By BRGM
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Distribution Patterns of Mercury in Lakes and Rivers of Northeastern North America
We assembled 831 data points for total mercury (Hgt) and 277 overlapping points for methyl mercury (CH3Hg+) in surface waters from Massachussetts, USA to the Island of Newfoundland, Canada from State, Provincial, and Federal government databases. These geographically indexed values were used to determine: (a) if large-scale spatial distribution patterns existed and (b) whether there were ...
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Measuring total mercury due to small-scale gold mining activities to determine community vulnerability in Cihonje, Central Java, Indonesia
This research is comparative study of gold mining and non-gold mining areas, using four community vulnerability indicators. Vulnerability indicators are exposure degree, contamination rate, chronic, and acute toxicity. Each indicator used different samples, such as wastewater from gold mining process, river water from Tajum river, human hair samples, and health questionnaire. This research ...
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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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Legal Lookout: EPA Expands Mercury Reduction Program
Untitled Document Mercury is a naturally occurring metal found in the Earth’s crust. At high doses, mercury is known to cause adverse human health effects. Over the past several years, EPA has focused on mercury exposures because of its potential to cause adverse human health and environmental effects, and because of its persistence and widespread distribution in the ...
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Rapid removal of heavy metal ions from aqueous solutions by low cost adsorbents
In the present investigation, different agricultural solid wastes namely: eggplant hull (EH), almond green hull (AGH), and walnut shell (WS), that are introduced as low cost adsorbents, were used for the removal of heavy metals (cobalt, strontium and mercury ions) from aqueous solutions. Activation process and/or chemical treatments using H2O2 and NH3 were performed on these raw materials to ...
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Mercury contamination of surface water and fish in a gold mining region (Cuyuni river basin, Venezuela)
In the Cuyuni river basin (Venezuela), artisanal gold mining has caused significant mercury pollution due to extensive use of Hg in Au amalgamation processes. High Hg concentrations up to 4.60 ?g/l were recorded in surface water samples (rivers, streams, mining ponds, springs), which are three orders of magnitude higher than normal worldwide background values (0.003?0.005 ?g/l). Furthermore, Hg ...
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Diurnal variations of total mercury (THg), reactive mercury (RHg), and dissolved gaseous mercury and water/air mercury flux in warm and cold season from fresh waters of Southwestern China
Diurnal variations of water total mercury (THg), reactive mercury (RHg), and dissolved gaseous mercury (DGM) concentrations and mercury flux were monitored at two sites in warm and cold season in an alkaline reservoir in Southwestern China. Concentrations of THg and RHg as well as Hg fluxes usually exhibited a consistent diurnal trend with elevated values observed during day. The increasing ...
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Surfactant enhanced in-situ remediation of DNAPL impacted soil and groundwater - Montreal refinery
Abstract A Montreal chemical refinery reduced the dichlorobenzene and other dense non-aqueous phase liquid (DNAPL) impacts on the soil and groundwater where a railway line is adjacent to an above ground storage tank farm. Ivey-sol® surfactant mixtures were injected three times during a two week pilot test, into a series of in-situ wells. The soil and groundwater matrix experienced an induced ...
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Mercury waste treatment centre - Case study
The Mercury Waste Treatment Centre has been set-up by an oil and gas service company following the high demand of major oil and gas companies for local waste management solutions. Prior to the establishment of the econ supplied waste treatment centre, waste had to be shipped to be finally disposed of 13 000 km from the waste source. This involved complicated and expensive waste notification and ...
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Removal of trace mercury (II) from aqueous solution by
in situ MnOx combined with poly-aluminum chlorideRemoval of trace mercury from aqueous solution by Mn (hydr)oxides formed in situ during coagulation with poly-aluminum chloride (PAC) (in situ MnOx combined with PAC) was investigated. The efficiency of trace mercury removal was evaluated under the experimental conditions of reaction time, Mn dosage, pH, and temperature. In addition, the ionic strength and the initial mercury concentration were ...
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Heavy metals removal from water by adsorption on propylthiol-functionalised mesoporous silica obtained by co-condensation
Propylthiol-functionalised mesoporous silica SBA-15 prepared by co-condensation has been tested for heavy metal removal. Adsorption from aqueous solution was examined for Cu(II), Pb(II), Cd(II), and Hg(II). Adsorption isotherms were determined at 20°C and Langmuir and Freundlich models were fitted to experimental data. The results from adsorption experiments indicate that mercury is efficiently ...
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Contamination by mercury of groundwater of the North Numidian zone of Azzaba, North East Algeria. Effect of inorganic mercury contamination of population
The mercury ore deposit of Azzaba is located on the northern flank of the limestone chain, south of Azzaba town, North East Algeria. Nineteen springs and wells from the two aquifers were sampled for chemical analyses. Water of the Oligocene aquifer shows high Hg contents (up to 80 (g.L−1) whereas in the deep aquifer, Hg contents do not exceed 7 µg.L−1). School children of the Azzaba region have a ...
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A portable calibration gas generator for H2O, HCl, NH3 and Mercury
Abstract The calibration of emission measurement systems for water vapor, hydrogen chloride, ammonia and mercury is difficult and span gas is not available for every component. On the principle of the dynamic evaporation of liquids and the continuous addition of carries gas, a portable calibration gas generator was developed. Linearity, accuracy and the reproducibility is comparable with the ...
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Ebullition rates and mercury concentrations in St. Lawrence River sediments and a benthic invertebrate
Ebullition, the release of gas from anaerobic decomposition in sediments, was recorded in a mercury‐contaminated depositional zone (zone 1) of the St. Lawrence River area of concern in Cornwall, Ontario, Canada. Our aim was to test if this disturbance affected the bioavailability of total mercury (THg) and methylmercury (MeHg) in surficial sediments to a benthic invertebrate (Echinogammarus ...
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