water chemistry analysis Articles

  • Community Structure of In-Stream Bryophytes in English and Welsh Rivers

    Information on the distribution of bryophytes in mainland British rivers was collected as part of the Joint Nature Conservancy Council (JNCC) survey of in-stream macrophyte distribution between 1978 and 1997. A sub-set of sites (1604) containing the 50 most common bryophytes was analysed. The commonest of these 50 species were Fontinalis antipyretica and Rhynchostegium riparioides. The majority ...


    By Springer

  • Reverse Osmosis

    The United States Pharmacopeial Convention Inc. (USP) has proposed new specifications for Water for Injection (WFI) and Purified Water (PW). These specifications will include quantitative conductivity, and total organic carbon (TOC) measurements will replace 100-year-old qualitative wet chemistry tests. The impetus behind these changes is to create a means of analysis that is less ...


  • Quantifying Uncertainty in Critical Loads: (A) Literature Review

    Abstract  Critical loads are the basis for policies controlling emissions of acidic substances in Europe. The implementation of these policies involves large expenditures, and it is reasonable for policymakers to ask what degree of certainty can be attached to the underlying critical load and exceedance estimates. This paper is a literature review of studies which attempt to estimate the ...


  • News on Food 2013, Volume 2: Simplify Sample Prep, and Increase Speed and Sensitivity

    Analytical testing is used 1) to determine nutritional value and quality and 2) to ensure food safety and security. We have developed and continue to develop, specialized products that allow food analysts to simplify sample prep, and increase speed and sensitivity for many food and beverage applications. In this second issue of “News On Food”, we will focus on our continuously ...


    By MilliporeSigma

  • Spatial variability of nutrients (N, P) in a deep, temperate lake with a low trophic level supported by global navigation satellite systems, geographic information system and geostatistics

    We investigated changes in the spatial distribution of phosphorus (P) and nitrogen (N) in the deep, mesotrophic Lake Hańcza. The raw data collection, supported by global navigation satellite system (GNSS) positioning, was conducted on 79 sampling points. A geostatistical method (kriging) was applied in spatial interpolation. Despite the relatively small area of the lake (3.04 km2), ...


    By IWA Publishing

  • What is Chemical Oxygen Demand (COD)?

    Chemical Oxygen Demand (COD) analysis is a measurement of the oxygen-depletion capacity of a water sample contaminated with organic waste matter. Specifically, it measures the equivalent amount of oxygen required to chemically oxidize organic compounds in water. Why Measure COD? COD is used as a general indicator of water quality and is an integral part of all water quality ...


    By MANTECH Inc.

  • Simple laboratory techniques improve the operation of RO pre-treatment systems

    Membrane failures are often caused by poor pre-treatment design and/or poor operation. Systems are frequently designed and built without a clear understanding of the chemistry of the feed water to be treated and the physical characteristics of the particulate matter it contains. The larger the system the more likely is some incident of pre-treatment failure, often at a high financial cost to the ...

  • A pump-less discrete opto-fluidic chemical spectrophotometry system (DOCSS) for online in situ monitoring of dissolved contaminants in aqueous media

    This paper presents the fabrication of a discrete chemical analyzer system for online monitoring of dissolved ions in water using UV-VIS absorption spectrophotometry. The device is composed of three main components: fluidic, optical, and control. The test cell was designed to also function as a non-invasive volume sensor, and the volume sensing principle was based on light scattering by ...


    By IWA Publishing

  • A systematic approach for evaluation of capture zones at pump and treat systems

    This document describes a systematic approach for performing capture zone analysis associated with ground-water pump and treat (P&T) systems. A “Capture Zone” refers to the three-dimensional region that contributes the ground water extracted by one or more wells or drains (see Figure 1). A capture zone in this context is equivalent to the “zone of hydraulic containment”. If a contaminant ...

  • Non toxic reagents for SEIBOLD online-analyser for heavy metals

    Reagents and chemistry used with SEIBOLD COMPOSER Analysers are free from toxic compounds. Our "Green Thumb" project started in 2006 and delivered its first products in 2008. In 2011 the complete range of SEIBOLD COMPOSER Analyser for Heavy Metals has been introduced to the market. SEIBOLD's Analyser series COMPOSER is based on spectrophotometric technology. Measured concentration is a function ...

  • Surface coal mining influences on macroinvertebrate assemblages in streams of the Canadian Rocky Mountains

    To determine the region specific impacts of surface coal mines on macroinvertebrate community health, chemical and physical stream characteristics and macroinvertebrate family and community metrics were measured in surface coal mine‐affected and reference streams in the Canadian Rocky Mountains. Water chemistry was significantly altered in mine‐affected streams which had elevated conductivity, ...


    By John Wiley & Sons, Ltd.

  • Chemical cleaning is cost-effective, efficient

    Chemical cleaning is an important offering within Clean Harbors’ portfolio of industrial cleaning/maintenance services for refineries, petrochemical processors and other process manufacturers. Along with high-pressure cleaning, pigging, Tech Sonic sound wave cleaning and other technologies, chemical leaning is a safe, efficient and cost-effective way to remove corrosion, deposits, residual ...


    By Clean Harbors

  • Reverse Osmosis for WFI and PW

    The United States Pharmacopeial Convention Inc. (USP) has proposed new specifications for Water for Injection (WFI) and Purified Water (PW). These specifications will include quantitative conductivity, and total organic carbon (TOC) measurements will replace 100-year-old qualitative wet chemistry tests. The impetus behind these changes is to create a means of analysis that is less ...

  • Arsenic wood field testing kit

    Now available from Industrial Test Systems, Inc. is a quick, easy, field test kit that can confirm the presence of inorganic arsenic in wood. Arsenic Quick™ 481396-W kit is a modification of the US Patented, ETV Verified arsenic test for drinking water. This 10 minute test readily confirms the absence or presence of arsenic in any wood sample, including CCA treated lumber using safe ...

  • Geochemical control processes and potential sediment toxicity in a mine‐impacted lake

    Geochemical parameters and major ion concentrations from sediments of a freshwater lake in the town of Åtvidaberg, south‐eastern, Sweden, were used to identify the geochemical processes that control the water chemistry. The lake sediments are anoxic, characterized by reduced sulphur and sulphidic minerals. The hypothesis tested is that in sulphidic‐anaerobic contaminated sediments, the ...


    By John Wiley & Sons, Ltd.

  • Aqua Pennsylvania SORB 33® System

    Site Background Aqua Pennsylvania, headquartered in Bryn Mawr, PA and a division of Aqua America, operates a 190 gallons per minute (gpm) well and pumphouse in a new residential development near the town of Collegeville, PA. Aqua PA has plans to add a second 250 gpm well for the same system in the future bringing the pumping capacity to 450 gpm. Well water is pumped into the pumphouse pictured ...

  • Applying biotic ligand models and Bayesian techniques: Ecological risk assessment of copper and nickel in Tokyo rivers

    Biotic ligand models (BLMs) have been broadly accepted and used in ecological risk assessment of heavy metals for toxicity normalization with respect to water chemistry. However, the importance of assessing bioavailability by using BLMs has not been widely recognized among Japanese stakeholders. Failing to consider bioavailability may result in less effective risk management than would be ...


    By John Wiley & Sons, Ltd.

  • Pathway‐based approaches for assessment of real‐time exposure to an estrogenic wastewater treatment plant effluent on fathead minnow reproduction

    Wastewater treatment plant (WWTP) effluents are known contributors of chemical mixtures into the environment. Of particular concern are endocrine‐disrupting compounds, such as estrogens, that can affect hypothalamic‐pituitary‐gonadal axis function in exposed organisms. The present study examined reproductive effects in fathead minnows exposed for 21 d to a historically estrogenic WWTP ...


    By John Wiley & Sons, Ltd.

  • Groundwater: Low-flow Purging and Sampling

    Significant timesavings, improved sample process integrity, quality assurance and minimal quantities of potentially contaminated purge water to manage - are attractive as the focus on groundwater quality sharpens and economics demand best cost-benefit based methods Water has become a vitally important resource.  Maintaining its quality and quantity and avoiding pollution are set to be ...


    By Geotech

  • Meeting the Need for LIMS at a smaller laboratory case study

    EMS Inc (Environmental Management Services) offers environmental sample collection, VELAP (Virginia Environmental Laboratory Accreditation Program) accredited laboratory analysis, water and wastewater plant operations, and consulting services to both industrial and commercial clients. By introducing Autoscribe's entry level Matrix Express LIMS (Laboratory Information Management System), EMS Inc ...


    By Autoscribe Informatics

Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you