laboratory sample Articles

  • Cleaning without material loss

    Cleaning without material loss: Hydraulic Easy Cleaning-Construction reduces cleaning of the Single-shaft shredder and facilitates work processes Many materials have to be comminuted before further processing - this includes different chips and stamped parts made of plastic and metal, but also valuable precious metals such as gold and silver as well as laboratory samples. In this process, a part ...

  • Nitrates/nitrites concentration estimation in wastewater samples using transmittance curve models optimized by evolutionary computation techniques

    This paper presents an application of evolutionary computation algorithms in the estimation of the concentration of nitrates/nitrites in water. Specifically, we start from the measured transmittance curves of a water sample and a model of the curve consisting of a mixture of polynomial, Fermi and Gaussian functions. An evolutionary programming algorithm is then used to obtain the optimal ...


    By IWA Publishing

  • Threshold‐dependent sample sizes for selenium assessment with stream fish tissue

    Natural resource managers are developing assessments of selenium (Se) contamination in freshwater ecosystems based on fish tissue concentrations. We evaluated the effects of sample size (i.e., number of fish per site) on the probability of correctly detecting mean whole‐body Se values above a range of potential management thresholds. We modeled Se concentrations as gamma distributions with ...


    By John Wiley & Sons, Ltd.

  • Field Screening Methods for the Presence of DNAPL, Superfund Site, southern California

    Characterizing the lateral and vertical extent at a Dense Non Aqueous Phase Liquid (DNAPL) impacted site can prove to be a challenging task. Field methods employed to verify the presence of DNAPL have included the use of down-hole Ultraviolet Induced Florescence technologies, the application of down-hole detection materials such as dye impregnated fabrics, and the installation of monitor wells ...


    By Hargis + Associates Inc

  • Spectral in-situ analysis of NO2, NO3, COD, DOC and TSS in the effluent of a WWTP

    Abstract: An in-situ UV spectrometer was applied to the effluent of a WWTP in Switzerland and calibrated using a multivariate calibration algorithm based on PLS regression. Except for nitrite, the calibration was based on comparative measurements of the effluent in the plant laboratory. Samples made of stock solution added to three different matrices prepared in the EAWAG laboratory were used for ...


    By inCTRL Solutions Inc.

  • Modelling biological Cr(VI) reduction in aquifer microcosm column systems

    Several chrome processing facilities in South Africa release hexavalent chromium (Cr(VI)) into groundwater resources. Pump-and-treat remediation processes have been implemented at some of the sites but have not been successful in reducing contamination levels. The current study is aimed at developing an environmentally friendly, cost-effective and self-sustained biological method to curb the ...


    By IWA Publishing

  • Particle size characterization of oak wood leachate: chemical oxygen demand and toxicity distribution within different fractions

    Oak wood leachate obtained from two storage facilities (storage pound and ditch) in a wood-based industry, and leachate generated by a laboratory leaching test, were characterized in seven categories regarding particle size distribution (PSD) (raw leachate, ≤20 μm, ≤10 μm, ≤1.2 μm, ≤13 nm, ≤5 nm and ≤2 nm). The PSD followed a normal ...


    By IWA Publishing

  • Expansive Soils under Cyclic Drying and Wetting

    An approach was developed to study the swell-shrinkage behavior of expansive soil samples in the laboratory under the action of the actual load to which the soil will be subjected in the field. The fatigue phenomenon due to cyclic drying and wetting has been under investigation, and this paper describes in detail the modified oedometer used in this investigation and the testing procedure adopted. ...


    By ASTM International

  • Evaluation of EN15662:2008 - Determination of Pesticide Residue in Food of Plant Origin, by an Automated QuEChERS Solution

    Introduction Pesticide residue laboratories are required to undertake analyses of an ever increasing number of samples. The analyses typically involve use of multi-residue methods (both GC-MS and LC-MS) to test for over 500 pesticide residues. Due to its ease of use and proven robustness, the QuEChERS extraction has become the method of choice for pesticides multi-residue analyses in a wide ...


    By Teledyne Tekmar

  • Silver nanoparticle toxicity to Atlantic killifish (Fundulus heteroclitus) and Caenorhabditis elegans: A comparison of mesocosm, microcosm and conventional laboratory studies

    The use of silver nanoparticles in consumer products and industrial applications, as well as recent detection in waste streams, has created concern over potential impacts on aquatic ecosystems. The effect of complex environmental media on silver nanoparticle toxicity was investigated using wetland mesocosms and smaller scale microcosms. Mesocosms were dosed with 2.5 mg Ag/L as gum arabic (GA) ...


    By John Wiley & Sons, Ltd.

  • UK Health and Safety Laboratory samples with Axetris mass flow controllers - Case study

    Proficiency testing ensures workplace & consumer safety The Health and Safety Laboratory (HSL) runs a state-of-the-art atmosphere generation system for recreating polluted atmospheres and accurate loading of standards of hazardous materials such as VOCs. These standards are used for conformity testing by participating laboratories as part of proficiency testing schemes. Axetris' mass ...


    By Axetris AG

  • Matrix Gemini LIMS at work in a Health Screening Laboratory Case Study

    Eastern Deanery Aids Relief Program (Nairobi, Kenya) has improved data recording, speeded up sample throughput and allowed a direct link to existing electronic patient records by replacing its paper-based laboratory documentation system with Matrix Gemini LIMS. Background Eastern Deanery Aids Relief Program (EDARP) is a non-profit Christian faith-based organization which serves ...


    By Autoscribe Informatics

  • COMMINUTION OF NUTS – GENERATION OF REPRESENTATIVE SAMPLES

    DETAILED SAMPLE PREPARATION OF NUTS ACCORDING TO REGULATION (EG) NO. 401/2006 WITH TIPS, APPROACHES AND PHOTOS OF THE INDIVIDUAL STEPS With the REGULATION (EG) no. 401/2006 of the COMMISSION of 23rd February 2006 binding standards for sampling procedures and analysis methods for the official testing of the mycotoxin content of food stuffs for example nuts was established. ...


    By Fritsch Milling and Sizing

  • Evaluation of an MPN test for the rapid enumeration of Pseudomonas aeruginosa in hospital waters

    In this study, the performance of a new most probable number (MPN) test (Pseudalert®/Quanti-Tray®) for the enumeration of Pseudomonas aeruginosa from hospital waters was compared with both international and national membrane filtration-based culture methods for P. aeruginosa: ISO 16266:2006 and UK The Microbiology of Drinking Water ...


    By IWA Publishing

  • How can I keep my samples secure and tamper proof?

    The first stage of any test is to collect a sample. Whether it’s water, biological tissues, or a sample from a production line, it must be representative of the bulk and not be altered in order to give accurate results. Most samples will have to be transported after they are collected – this might be just a few meters from a production line to the test room, or could be ...


    By Camlab Limited

  • Case study - EPH in soil evaluation study at tank farm site

    Ambient Engineering, Inc. (Concord, MA) used Sitelab to investigate and remediate a former tank farm along Boston Harbor contaminated by a large, subsurface plume of commingled diesel fuel and No. 6 fuel oil. Ambient’s Licensed Site Professional (LSP) had the opportunity – and budget – to evaluate Sitelab against three certified laboratories. Soil samples were collected from ...


    By Sitelab Corporation

  • Phosphate release from waste stabilisation pond sludge: significance and fate of polyphosphate

    Net phosphorus removal from waste stabilisation pond (WSP) systems is governed by the rate of phosphorus incorporation into the sludge layer and the rate of phosphorus release from this sludge back to the overlying wastewater. Luxury uptake of phosphorus by microalgae has been shown to occur under WSP conditions in the laboratory; however, the significance of this mechanism and the fate of ...


    By IWA Publishing

  • Pilot and Industrial-Scale Experimental Investigation of Numerically Optimized Cyclones

    A new geometry of reverse-flow gas cyclones obtained by numerical optimization was shown at the laboratory scale to be significantly more efficient than other high-efficiency designs. However, it is usually recognized that experimental results obtained with laboratory-scale or sampling cyclones cannot be extrapolated to pilot or industrial scales. The present paper confirms, at these larger ...

  • Chlorinated solvents

    The initial PSG survey identified TCE source areas that did not agree with the GPR survey findings. Based on these results, a subsequent PSG survey was performed to further characterize the site and better define the source areas identified in the initial survey. Analytical results were provided to the client within four (4) days of receipt of samples at the laboratory for both surveys. The ...

  • Residential spill in VA

    Laboratory analysis of soil samples showed high values of TPH/DRO showing an initial value of 18,800 and 8,300 ppm and the samples of soil analyzed after treatment with VaporRemed showed a value of 290 ppm and 210 ppm. Both these values are below the stipulated 500 ppm of TPH/DRO. The TPH in the drain water after flushing with the product showed values below the detection levels. The project was ...


    By Sarva Bio Remed, LLC

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