contaminant data Articles
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Advanced Data Analysis Strategies for Understanding Particle Contamination in Chemical Distribution Systems
Abstract Advanced data analysis techniques can be implemented to quantitatively assess particle contamination data in state-of-the-art chemical distribution systems. Through examining the distribution of the rate of particle detection compared to Poisson’s distribution, it is possible to determine if particle variations are random or systematic and allow for the focus of improvement ...
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An investigation of the impact of left‐censored soil contamination data on the uncertainty of descriptive statistical parameters
Left‐censored concentration data are frequently encountered because measuring instruments cannot detect concentrations below instruments detection limit (DL). For statistical analysis of left‐censored data, environmental literature mainly refers to the following methods: maximum likelihood estimation (MLE), regression on order statistics using lognormal and gamma assumption (rROS and GROS, ...
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Real-time statistical process control of aqueous cleaning systems through in-situ monitoring
Abstract Traditional off-line part cleanliness analysis is too slow for use as a process control tool. These tests, traditionally performed in a laboratory on a small number of representative part samples, are extremely time-consuming. Parts are already integrated into finished product before contamination data are available. Any problems identified at this point require product recall or rework ...
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Free Cooling: Is It Costing Data Centers Their Equipment Reliability?
Free-cooling allows airborne contaminants into data centers, which could cause corrosion on mission-critical electrical equipment. This could ultimately lead to downtime and repairs, costing data centers thousands of dollars per minute. Free cooling is seen as an economical way to cool equipment but it could be leading to costly equipment damage down the road. Free-cooling allows external ...
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Groundwater Remediation Strategies Tool
This guide provides strategies for focusing remediation efforts on 1) the change in contaminant mass flux in different subsurface transport compartments (e.g. the vadose zone, smear zone or a zone within an aquifer of interest) and 2) the change in remediation timeframe. In this approach, groundwater flow and contaminant concentration data are combined to estimate the rate of contaminant ...
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Marine pollution in Australia, with special emphasis on central New South Wales estuaries and adjacent continental margin
This paper reviews the current knowledge and environmental status of Australian estuaries and continental margins in terms of sedimentary heavy metals. Although only 2.5% of Australian estuaries and 0.1% of the adjacent continental shelf have been surveyed for sedimentary heavy metals, some of the most contaminated maritime areas in the world have been located in this country. The most ...
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A simple notch filter for removing high frequency noise in atmospheric measurements
The experimenter occasionally encounters high-frequency (> 1 Hz) contamination in sonic anemometer data that adversely affects higher-order moment calculations. One has the option of applying a low-pass filter (either a simple, equally weighted moving average filter or any one of the sharper cut-off versions available today) to eliminate not only the unwanted frequency, but all frequencies ...
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Data Center Contamination Control: A Case Study
In order to continue to deliver relevant and timely information, we polled a number of those receiving this newsletter as to what topics they would most like to see. The overwhelming majority came back with requests for more case studies and applications. Therefore, this month’s newsletter will be the first of several cases studies we will present over the coming months. And as always, we ...
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Evaluating the Vulnerability of Bored and Driven Wells in a Shallow Unconfined Aquifer
Shallow unconfined aquifers are the only source of water for private wells in some rural areas. The Oak Openings region of Ohio is one such location. Wells are usually bored or driven in shallow aquifers and are more susceptible to contamination caused by human activities on the surface. To provide better protection for consumers developing shallow wells, local health departments have doubled the ...
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Human pharmaceuticals in the marine environment: Focus on exposure and biological effects in animal species
Marine waters have been poorly investigated for the occurrence of pharmaceutical contamination. Recent data confirm that pharmaceuticals widely occur in marine and coastal environments; therefore assessment of potential risk to marine species needs further efforts. The present paper represents the first extensive review of pharmaceutical contamination in marine environments addressing the ...
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Water and hygiene interventions to reduce diarrhoea in rural Afghanistan: a randomized controlled study
A randomized controlled trial of four interventions was conducted using tubewells (n=2,486), liquid sodium hypochlorite (‘Clorin’) distributed with an improved water vessel (n=2,305), hygiene promotion (n=1,877), and a combination of the three (n=2,040) to create an evidence-base for water policy in Afghanistan. A fifth group served as a control (n=2,377). Interventions were randomized across 32 ...
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Partial life‐cycle and acute toxicity of perfluoralkyl acids to freshwater mussels
Freshwater mussels are among the most sensitive aquatic organisms to many contaminants and have complex life‐cycles that include several distinct life stages with unique contaminant exposure pathways.Standard acute (24–96h) and chronic (28d) toxicity tests with free larva (glochidia) and juvenile mussels are effective at generating data on contaminant effects at two discrete lifestages, but do ...
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Floodplain management
A SAWA case study by the Chamber of Agriculture, Lower Saxony (Landwirtschaftskammer Niedersachsen), Germany. The study is related to the SAWA-Project "Flood control and prevention in cooperation with rural development to reduce the inundation risk on agricultural land." With the increase of extreme rainfall due to Climate Change, the issue of nutrients and pollutants distribution on farmlands ...
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Modeling metal bioaccumulation and tissue distribution in killifish (Fundulus heteroclitus) in three contaminated estuaries
The present study experimentally assessed the uptake, loss, and resulting tissue distribution of As(V), Cd, Cr(III), Hg(II), and methylmercury (MeHg) in killifish (Fundulus heteroclitus) following aqueous exposure in water collected from 3 contaminated field sites—Baltimore Harbor and Elizabeth River (Chesapeake Bay), and Mare Island (San Francisco Bay)—using a radiotracer technique. Uptake ...
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Project - Copenhagen - Denmark
The contamination was due to leaks in 5 underground oil tanks inside a basement of an ancient hospital in Copenhagen, Denmark between October 2020 and April 2021. The project is in an urban area, in the middle of the city of Copenhagen with high-level constraints on noise and smells management. Key Data Contaminants: C10-C40 Max. Concentration: 22.000 mg/kg Volume: 235 m³ Tonnage: 400 ...
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Nanoparticle Monitoring in Ultra-Clean Manufacturing Environments
Abstract With its 10 nm sensitivity, the NPC10 NanoParticle Counter bridges the gap between conventional aerosol optical particle counting at 0.1 μm (100 nm) and sub-nm scale airborne molecular contamination. Experimental and field data demonstrate that ISO Class 1 and 2 environments, which have very low concentrations of particles greater than 100 nm, can possess much higher concentrations ...
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Microbial reporter gene assay as a diagnostic and early warning tool for the detection and characterization of toxic pollution in surface waters
Surface water samples constantly receive a vast mixture of micropollutants mainly originating from waste water treatment plants (WWTPs). High throughput live cell arrays provide a promising method for the characterization of the effects of chemicals and the associated molecular mechanisms. In the present study this test system was evaluated for the first time for the characterization of a set ...
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Project - Saint-Nazaire - France
This site was part of a rehabilitation project in an urban area of the city of Saint-Nazaire (France). The contamination of the site was presumably caused by the previous activities of a gas plant. Two ESTD piles (respectively 1.500m³ and 2000m³ of soil) were built to treat the contaminated soil. Key Data Contaminants: THC (C10-C40), BTEX, PAH Max. Concentration: C10-C40: 33.000 ...
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Project - Saint-Nazaire - France
This site was part of a rehabilitation project in an urban area of the city of Saint-Nazaire (France). The contamination of the site was presumably caused by the previous activities of a gas plant. Two ESTD piles (respectively 1.500m³ and 2000m³ of soil) were built to treat the contaminated soil. Key Data Contaminants: THC (C10-C40), BTEX, PAH Max. Concentration: C10-C40: 33.000 ...
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Developing a contaminated land use strategy
Landmark's Historical Map and Land Use datasets are invaluable for the identification of potentially contaminated land as part of the 1995 Environment Act. The challenge:Part IIa of the Environmental Protection Act 1990 makes local authorities responsible for the identification of historically contaminated land, which poses a threat to human health or to the environment, within their ...
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