water analytical method Articles

  • Method Scaling in Preparative HPLC: Analytical Method & Preparative Method

    VOC:  “I tried to scale up my analytical HPLC method to prep and it didn’t work.” Andy:  This is one of the most common things we hear from chemists wanting to do preparative chromatography. We also hear the following question pretty often too: VOC:  “I have a good analytical HPLC method, how do I scale it to ...


    By Waters Corporation

  • 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

  • Analytical method for estimating soil hydraulic parameters from horizontal absorption

    Soil hydraulic properties are required to quantitatively simulate water and chemical transport processes in the vadose zone and groundwater with various numerical models. Most methods for determination of soil hydraulic properties are time consuming and expensive, which limits the application of the methods. The objective of this study was to develop an analytical method based on an assumption of ...

  • Optimisation of analytical method for estrogen in surface water and primary risk assessment in South Creek

    A very non-polar sorbent, polystyrene-divinyl-benzene (brand: biobeads supplied by BioRad, with 30∼50 mesh) was tested for its extraction efficiency of four target compounds, estrone, estradiol, ethynylestradiol and estriol, from larger volumes (8 l) of water samples. To achieve adequate sensitivity of instrumental analysis by GC/MS, an improved estrogen derivatisation method was developed. For ...


    By Inderscience Publishers

  • Will your oil in water analysis method match the regulatory method?

    Anyone involved in field analysis of oil in water will continually get the question “Does your equipment match the regulatory method?” While the amount of oil in water is highly regulated -- it can also be a challenging measurement. It is complicated by the fact that oil comes in many forms and the measurement is defined by the particular regulatory method. When EPA 1664 is the ...


    By Spectro Scientific

  • Factors Affecting Oil in Water Testing Methods

    Various factors need to be considered when comparing methods to measure oil and grease in water.  Whether you are trying to meet effluent limits for an NPDES (National Pollutant Discharge Elimination System) permit, comply with oil and grease limits for the Clean Water Act (CWA), or an industry satisfying a POTW’s (Publically Owned Treatment Works) discharge permit, it is ...


    By Spectro Scientific

  • USEPA Method 1623 and 1623.1

    Introduction Cryptosporidium spp. and Giar-dia intestinaiis are well-known waterborne pathogens that have caused disease outbreaks around the globe. The 1993 outbreak of cryptosporidiosis in Milwaukee and subsequent outbreaks have stimulated research regarding the occurrence and behavior of these pathogens in natural waters. Substantial research efforts have been expended to identify factors ...


    By Analytical Services, Inc

  • Analytical Devices for the Measurement of Water Vapor and Hydrocarbon Dew-Point in Natural Gas

    Introduction The determination of water vapor (water dew point) is crucial in the processing, custody transfer and transport of natural gas. High levels of water vapor in a natural gas stream can lead to a number of problems which include the formation of hydrates and the contribution to corrosion of plant and equipment. Furthermore, water vapor present in natural gas streams affects the ...

  • EPA Speeds Alternative Method Approvals

    As anyone in the water business will tell you, standard analytical methods are critically important. On April 10, 2007, the EPA announced its intent to implement an expedited process for approving alternative analytical testing methods under various federal water programs. Background Under the Safe Drinking Water Act (SDWA), EPA promulgates national primary drinking water regulations ...


    By Bergeson & Campbell, P.C.

  • Ultra-trace arsenic speciation at Columbia Analytical

    Ultra-trace speciation of arsenic and other metals is performed using a variety of techniques tailored to the specific combination of species, matrix, and detection limits required. Currently, two analytical systems are applied: Ion Chromatography-Inductively Coupled Mass Spectrometry (IC-ICP-MS) and Hydride Generation-Cryogenic Gas Chromatography-Flame Atomic Absorption Spectrometry ...


  • Report on harmonization of freshwater biological methods

    Background and purpose of the document 1. The Water Framework Directive (WFD) requires (Annex V 1.3.6) that standards methods are used for the monitoring of water quality elements: ‘Methods used for the monitoring of type parameters shall conform to the international standards listed below or such other national or international standards which will ensure the provision of data of an ...


  • Web-based analytical services improve remediation efficiency

    In this article, Steven Holmes, from analytical services provider ALcontrol, explains how web-based software is helping to ramp up the speed of environmental analysis for remediation contractors such as Sanctus Limited. Background The development of brownfield sites can be more complicated and take longer than other types of building land. However, it is an attractive option ...


    By ALcontrol Laboratories

  • Analytics is not just about patterns in big data

    For most people, the term ‘data analytics’ conjures up images of Amazon, Facebook and Google: digitally born companies that gather huge data sets in order to better target products, adverts or services across a huge customer base. When it comes to really ...

  • Reverse-phase HPLC method for the simultaneous analysis of triclosan and triclocarban in surface waters

    A validated reverse-phase HPLC-DAD for the simultaneous determination of triclosan and triclocarban in surface water has been developed, because this method has not been used for determination of these disinfectant agents so far. An isocratic elution was achieved using a Develosil RP Aqueous AR-5 RP-30 column with a flow rate of 1.0 mL min−1. The mobile phase consisted of mixed methanol and water ...


    By IWA Publishing

  • Comparison of methods for the enumeration of Clostridium perfringens spores in water

    Four methods for enumerating Clostridium perfringens spores in water were evaluated: (1) the IMM (Iron Milk Medium) method (MPN); (2) the LS (Lactose Sulfite Broth) method (MPN); (3) the m-CP (membrane filtration Clostridium perfringens Agar) method (membrane filtration); and (4) the TSC (Tryptose Sulfite Cycloserine Agar) method (membrane filtration). The performance of these ...


    By IWA Publishing

  • A multi-method comparison of Atchafalaya basin surface water organic matter samples

    Received for publication January 29, 2008. Surface water organic matter (OM) was isolated from two distinct sites within the Atchafalaya Basin using a combination of XAD-8 and XAD-4 non-ionic macroporous resins and characterized by a suite of analytical methods, including elemental analysis, 13C cross polarization magic angle spinning nuclear magnetic resonance, attenuated total reflectance ...

  • Analytical solution for the flow velocity and water surface angle in drainage and sewer networks: case of pipes arranged in series

    Drainage and sewer network runs mostly under free surface flow condition. Among the characteristics which are important for practitioners are the flow velocity and water surface angle. The computation of these parameters in partially full pipes using Manning equation is implicit and requires iterative and laborious calculation methods. The goal of this paper is to provide a new method, where the ...


    By Inderscience Publishers

  • Dissolved trace metal speciation in estuarine and coastal waters: Comparison of WHAM/Model vii predictions with analytical results

    We apply the chemical speciation model WHAM/Model VII to investigate the distribution of metal species of Fe(III) and the divalent cations of Ni, Cu, Zn, Cd, Hg and Pb, in the water column of estuaries and coastal areas. We compare, for the same locations, measured and modelled free ion and organically bound metal concentrations. The modelled free ion calculations show varying levels of ...


    By John Wiley & Sons, Ltd.

  • Water Monitoring in drinking water plants - The Comparison Between On-Line TOC Analysis and the Permanganate Oxidation Method

    Introduction The role ofthe plants providing water is not restricted to the collection of water from areas where abundantly available and then distribution to the consumer. In reality, it involves a serious commitment to the guarantee of waterwhich is high quality. For this reason, drinking water facilities make use of conditioning plants which are equipped with chemical lab ...


    By Envitech Ltd.

  • Optimal closure of system actuators for transient control: an analytical approach

    The effect of downstream valve closure scheduling was analyzed to find optimal closure parameters that lead to the minimal maximum pressure head in the water distribution system. Several valve closure strategies were explored, combining the known valve performance curve (change in flow as a function of change in valve's opened area) with unknown valve closure curve (change in valve's opened ...


    By IWA Publishing

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