trace contaminant Articles
-
Rapid Measurement of Alcohol (Ethanol) in Beer and Wine Making by GC/FID
Improvements in manufacturing processes and equipment have allowed beer and wine producers to increase both the quantity and quality of the products. In the consumer products business, it is crucial to maintain good quality control practices. The higher throughput of manufacturing plants requires faster, more sophisticated analytical techniques to do this. Classical physical and sensory ...
-
Acute and chronic effects of diphenhydramine and sertraline mixtures in Ceriodaphnia dubia
Ceriodaphnia dubia were tested to evaluate the acute and chronic interactive effects of diphenhydramine and sertraline. Observed effects were compared to two reference toxicity models, the concentration addition model and the independent action model. Results indicate that the two drugs exhibit additive toxicity in C. dubia. In some cases, individually sublethal concentrations of the chemicals ...
-
The use of tetragnathid spiders as bioindicators of metal exposure at a coal ash spill site
On December 22, 2008 a dike containing coal fly ash from the Tennessee Valley Authority Kingston Fossil Plant failed and resulted in the largest coal ash spill in U.S. history. This study was designed to determine sediment metal concentrations at multiple site locations and to determine if site‐specific bioaccumulation of metals existed in tetragnathid spiders. Selenium and nickel were the ...
-
The value of utilising stochastic mapping of food distribution networks for understanding risks and tracing contaminant pathways
Difficulties in adequately characterising food supply chain topologies contribute major uncertainty to risk assessments of the food sector. The capability to trace contaminated foods forward (to consumers) and back (to providers) is needed for rapid recalls during food contamination events. The objective of this work is to develop an approach for risk mitigation that protects us from an attack on ...
-
Effect of preozonation on wastewater reclamation by the combination of ozonation and soil aquifer treatment
A series of column experiments and risk evaluation showed that preozonation was a better option to enhance the performance of soil aquifer treatment (SAT) than ozonation after SAT with respect to dissolved organic carbon, trace organic contaminants, and disinfection byproducts. This is a good example to show that upgrading pretreatments can be more effective than adding extra treatments after ...
-
Determination of Major Components and Trace Contaminants in Assorted Plating Baths by Atomic Absorption Analysis
Precious metal, non-ferrous, and ferrous plating operations cover almost every facet of modern life: automotive parts, kitchen & bathroom fixtures, electrical parts, electronic components, furniture, tools, plumbing, construction supplies, die castings, jewelry, etc. Good manufacturing practices, and lately, government regulations for environmental safety, have prompted many plating ...
-
Spatial and temporal variations in the transport and storage of trace metal contaminants in the upper Rio Pilcomayo, southern Bolivia
Mining of the Cerro Rico de Potosi precious metal-polymetallic tin deposits of Bolivia began in 1545 and has led to severe contamination of water and sediments of the upper Rio Pilcomayo drainage system. Detailed geomorphological, stratigraphic and geochemical analyses show that the downstream transport and deposition of sediment-borne trace metals from Cerro Rico vary among three types of river ...
-
Membrane fouling in the nanofiltration of landfill leachate and its impact on trace contaminant removal
Nanofiltration (NF) is an attractive option for the treatment of landfill leachate. However, membrane fouling can be a major obstacle in the implementation of this technology. In this study, bench-scale filtration experiments were carried out to study the fouling behaviour during the NF of a synthetic landfill leachate. The results indicate that calcium in combination with organic matter could ...
-
Investigating the fouling layer of polyamide nanofiltration membranes treating two different natural waters: internal heterogeneity yet converging surface properties
This study investigated the fouling of four polyamide nanofiltration membranes by two surface waters that differed substantially in major properties. The emphasis was on determining the characteristics of the fouling layer on the membranes. The rates of fouling for the two waters differed considerably, with a more rapid flux decline being observed for the water having higher biopolymer and major ...
-
Removal of trace organic contaminants by nitrifying activated sludge and whole-cell and crude enzyme extract of
Trametes versicolor The resistance of certain anthropogenic trace organic contaminants (TrOCs) to conventional wastewater treatment and their potential adverse effects on human and ecological health raise significant concerns and have prompted research on their bioremediation by white-rot fungi. This study compared the removal efficiencies of four widespread TrOCs: carbamazepine (CBZ), sulfamethoxazole (SMX), ...
-
Biogas and Anaerobic Digestion in Relation to CH4 Methane Monitoring
The use of biogas as a renewable energy source currently accounts for 10 % of global primary energy consumption1 and is often heralded as the perfect example of the ‘circular economy’ – where waste products can be reused to generate energy for other processes in a self-perpetuating cycle.2 Biogas consists of the mixture of gases produced by the breakdown of organic matter by ...
-
Plant diversity in relation to anthropogenic trace metals in soils of selected sites in Nigeria's Guinea Savanna
Studies on the contributions of anthropogenic activities to trace metal contamination in the soils of the West African sub-region, and their effects on the biodiversity of the area, are scanty. The effect of the trace metal content of soil, contributed by some anthropogenic activities (cultivation, vehicular traffic and industrial activity), on the plant diversity and vegetation structure in each ...
-
Membrane bioreactor technology for decentralised wastewater treatment and reuse
There is a growing interest in utilising non-traditional water resources by means of water reclamation and water recycling for long term sustainability. Amongst the many treatment alternatives, membrane bioreactors (MBRs) have been seen as an effective technology capable of transforming various types of wastewater into high-quality effluent exceeding most discharge requirements and suitable for a ...
-
Marine phanerogams as a tool in the evaluation of marine trace-metal contamination: an example from the Mediterranean
New ways of evaluating the quality of the coastal marine environment in a practical, dependable and cost-efficient manner are continually sought. It would thus appear of some value to make use of bioindicator species that reflect both the average levels and the temporal variations of contaminants at a given site. Owing to their extensive distribution in the littoral zone and the ecological ...
-
Conductivity Measurement in high purity water samples below 10 microsiems/cm
High Purity Water Resistivity/ Conductivity Measurement Ultra-Pure Water without any chemical impurities will still have a conductivity because of the presence of H* and OH" ions due to the self-ionization of water. Ultra-pure water has a conductivity of 0.055 HSiemens'cm or a resistivity of 18.18 mQ-cm at 25 °C. In order to know the conductivity or resistivity of ultra-pure water it is ...
-
Analysis of Organophosphorus Pesticides in Baby Foods Using a Triple-Quadrupole GC/MS/MS System
Contamination of food products with pesticides is a growing concern because of recognized adverse health effects, increasing world-wide usage of pesticides, and increasing imports of raw foodstuffs from foreign sources. The concern is particularly acute for baby foods because of the high vulnerability of babies to adverse health effects from synthetic chemicals, particularly pesticides. ...
-
Introduction Pack - Case Study
PROBLEM How is it possible to optimise the temperature of washwater used for cooling and removing trace contaminants from fibres during the final stages of rayon manufacture? A robust method for heating acidified recycled washwater was required. Direct steam injection into cold fluids in an empty pipe is thermally efficient, but results in other serious problems associated with vibration, noise ...
-
Thermal Activation of Digested Sewage Sludges for Carbon Dioxide Removal from Biogas
Sewage sludges from a wastewater treatment plant (WWT) were anaerobically digested for the biogas production and energy use. The refuses of such process were used as starting material for the char production for the gas cleaning process. These char samples were experimentally tested as adsorbents for the removal of CO2 and trace contaminants from the biogas mixture produced from the WWT plant. A ...
-
Understanding aqueous trace metal characteristics from industrial sources in China
Trace metals are a group of toxic pollutants that can cause serious damage to ecosystems and humans. To determine the distribution characteristics of aqueous trace metal contamination and identify critical pollution sources, it is necessary to develop a detailed estimation of trace metal emissions. By considering emission-related factors in each industrial sector, we estimate that the ...
-
Membrane-integrated hybrid bioremediation of industrial wastewater: a continuous treatment and recycling approach
A new membrane-integrated hybrid treatment system was investigated to turn highly hazardous coke wastewater reusable. This could protect both air and surface water bodies from toxic contaminants such as ammonia, phenol, cyanide, thiocyanate and other carcinogenic aromatic compounds which are normally released into the environment during discharge of coke wastewater and during quenching of coke ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you