water sampling laboratory Articles

  • Residual indicator bacteria in autosampler tubing: a field and laboratory assessment

    Microbial contamination in surface waters has become a worldwide cause for concern. As efforts are made to reduce this contamination, monitoring is integral to documenting and evaluating water quality improvements. Autosamplers are beneficial in such monitoring efforts, as large data sets can be generated with minimized effort. The extent to which autosamplers can be utilized for microbial ...


    By IWA Publishing

  • Laboratory study on precipitation of strontium sulphate in Malaysia sandstone cores

    Scale formation is one of the most serious oil field problems that inflict water injection systems primarily when two incompatible waters are involved. Two waters are incompatible if they interact chemically and precipitate minerals mixed. Due to the lack of reaction kinetics data, the rate of strontium sulphate deposition in porous rock was measured through flooding sandstone core samples of ...


    By Inderscience Publishers

  • Rapid and specific detection of Salmonella in water samples using real-time PCR and High Resolution Melt (HRM) curve analysis

    A real-time PCR assay combined with a pre-enrichment step for the specific and rapid detection of Salmonella in water samples is described. Following amplification of the invA gene target, High Resolution Melt (HRM) curve analysis was used to discriminate between products formed and to positively identify invA amplification. The real-time PCR assay was evaluated ...


    By IWA Publishing

  • The effect of sodium thiosulfate dechlorination on fecal indicator bacteria enumeration: laboratory and field data

    In microbiological water quality testing, sample dechlorination with sodium thiosulfate is recommended to ensure that results accurately reflect the water quality at sample collection. Nevertheless, monitoring institutions in low-resource settings do not always dechlorinate samples, and there is limited research describing how this practice impacts drinking water quality results. The effect of ...


    By IWA Publishing

  • 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 ...


    By Arizona Instrument LLC

  • Cleanup of Hazardous Waste Site Samples by Solid Phase Extraction

    ENVI-Florisil solid phase extraction tubes meet the requirements for pesticide recovery from water, sediment, and soil samples taken from hazardous waste sites, as described in US EPA Contract Laboratory Program methodology.  Mean recovery of nine pesticides was 82% or better, well within the specifications of the CLP method.  A procedure for recovering the pesticides is described. ...


    By MilliporeSigma

  • Drinking Water Analysis Guide

    Public Water Systems (PWS), regulated by the United States Environmental Protection Agency (USEPA), provide drinking water to 90% of Americans. Water systems and laboratories testing drinking water for Safe Drinking Water Act (SDWA) compliance must be certified and must use USEPA approved methods, which are developed by the USEPA, other government agencies, universities, consensus method ...

  • The 10 Key Factors in Selecting a Stack Sampling Firm

    Summary: This document is a summary of the key factors that you should take into consideration when hiring a stack testing firm.This has been prepared in conjunction with the ASTM criteria for standard practice of testing companies.The ASTM criteria has been supplemented, based on 125 years of direct testing experience, which is the combined years of experience of the individuals that contributed ...

  • Effect of Leaching from Filters on Laboratory Analyses of Collective Organic Constituents

    Membrane and glass fiber filters are widely used in laboratory water and wastewater analyses. During sample filtration, some filters release organic compounds, which may interfere with organic analyses. This research investigated the interferences due to organic leaching in the determinations of dissolved organic carbon, biodegradable dissolved organic carbon, soluble biochemical oxygen demand, ...

  • ITRC technical regulatory guidelines for passive diffusion sampling, 2004

    Polyethylene diffusion bag (PDB) samplers are low-density polyethylene bags containing deionized water, used to collect water samples in groundwater wells for laboratory analyses of volatile organic compounds (VOCs). PDB samplers are passive devices, relying on the movement of groundwater from the aquifer or water-bearing zone through the screen or open interval of a well. VOCs in groundwater ...


    By EON Products Inc.

  • Integration of thermo scientific Sample manager lims and CSOLS remote sampler at northern Ireland water delivers enhanced audit trail, significant time and cost savings

    Northern Ireland Water (formerly Water Service) is the sole provider of water and sewerage services in Northern Ireland. It is a Government Owned Company (GoCo) set up in April 2007 to provide the water and sewerage services in Northern Ireland. There are approximately 795,000 domestic, agricultural, commercial and business properties in Northern Ireland connected to the public water supply and ...

  • Passive sampling methods for contaminated sediments: State of the science for organic contaminants

    This manuscript surveys the literature on passive sampler methods (PSMs) used in contaminated sediments to assess the chemical activity of organic contaminants. The chemical activity in turn dictates the reactivity and bioavailability of contaminants in sediment. Approaches to measure specific binding of compounds to sediment components, e.g., amorphous carbon or specific types of reduced ...


    By John Wiley & Sons, Ltd.

  • Oil in frac water testing

    The amount of water used in and produced by hydraulic fracturing of shale gas wells is in the millions of gallons per well. Whether the water is going to be taken off site for disposal or reused for re-injection, the flowback or produced water needs pretreatment to remove any residual oil from the wa-ter. Waiting for remote laboratory results can take several days to a week. The InfraCal TOG/TPH ...


    By Spectro Scientific

  • Mineral water: a microbiological approach

    Total coliforms, Escherichia coli, Pseudomonas aeruginosa and high heterotrophic plate count were found in bottled mineral water. What may represent an important public health problem, because the presence of these microorganisms can be harmful to the health of the consumer, principally because some are opportunistic pathogens capable of causing infections in vulnerable individuals. Sales of ...


    By IWA Publishing

  • Case Study – Water Utility

    Sweetwater Authority, CA Sweetwater Authority’s mission is to provide its current and future customers with a safe, reliable and affordable water supply through the use of the best available technology, sound management practices, public participation and a balanced approach to human and environmental needs. Application Sweetwater regularly ...


    By Seveno DataSight

  • Mining Water Quality Application

    Isaac Plains Coal Mine Isaac Plains is an open cut coal mine, in Northern Queensland, Australia. The Isaac Plains Project operates under an Environmental Authority (EA). One of the environmental monitoring requirements which must be met is monitoring water. These include potable water, mine affected water, natural creek flows, water releases, groundwater and the receiving environment. The ...


    By ANDalyze, Inc.

  • The productive environmental laboratory: BSK Labs boosts efficiency with Metrohm IC

    BSK Labs runs a number of environmental laboratories and service centers along the west coast of the US. A total of 70 employees – including microbiologists, chemists, lab technicians, and support staff – make sure that the 200 to 350 samples that come in every week are analyzed. BSK Labs specializes in potable water chemistry, ground water monitoring, storm water runoff, solid waste ...


    By Metrohm AG

  • Comparing Field Portable X-Ray Fluorescence (XRF) To Laboratory Analysis Of Heavy Metals In Soil

    ABSTRACT Field portable x-ray fluorescence (XRF) continues to gain acceptance as a complement to traditional laboratory testing of metal contaminated soil. The quality of data produced by field XRF varies with site conditions, soil composition, and sample preparation. Quality assurance protocols for the field method usually require that a number of field samples be split and sent to a ...

  • Mass Spectrometry Makes Cents for UC San Diego Clinical Laboratory

    “Fast is fine; but accuracy is everything.” The quote is attributed to the famous Wyatt Earp, a sharpshooter and lawman who, with help from his two brothers, sent three outlaws to their graves in the Gunfight at the O.K. Corral in Tombstone, Arizona in 1881. One hundred ...


    By Waters Corporation

  • Increased sample throughput for ICP-OES applied to U.S. EPA method 200.7

    The application of an SC-FAST sample introduction system to the analysis of natural and certified water samples is described. The SC-FAST system consists of an autosampler, sample loop, switching valve, high efficiency nebulizer and a glass cyclonic spray chamber to perform analysis by direct nebulization. The potential benefits of this introduction system are numerous and include: increased ...


    By PerkinElmer, Inc.

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