ion selective Articles

  • Soil CEC and Selectivity Sequence for Mercury (II) Ion

    Abstract Mercury is one of the most hazardous air and water pollutants. Since the issuance of the Clean Air Mercury Rule for coal-fired electric boiler utilities in March 2005, numerous scientific researches have focused on the fate and transport of mercury in both atmosphere and aqueous environment. The issue of aqueous mercury transport as the major mercury transport mechanism becomes more and ...


    By DAA Consultants

  • Determining Nitrate and Nitrite Sequentially Using a Nitrite Ion Selective Electrode

    ABSTRACT Reliable analysis for NO3- and NO2- contained in wastewater, soils and reclaimed water is extremely important as these constituents can easily leach into ...


  • Two Detector Solution to Analyzing Sulfur

    Sulfur compounds are reactive, corrosive to pipes, and destructive to catalysts in petroleum refineries. Sulfur emission are strictly regulated globally. When released into the atmosphere sulfur dioxide converts to sulfuric acid resulting in adverse effects on human health and the environment. Sulfur detection is found useful in many other industries; therefore, detection of sulfur compounds in ...


    By Restek Corporation

  • Selective DBP Precursor Removal with an Innovative Ion Exchange Process

    The City of Chesapeake, Virginia has provided a reliable and safe drinking water to its customers for many years. The City has been providing this drinking water despite a water supply that is extremely high in organics with seasonal outbreaks of chlorides.  As a result, the 10-mgd Northwest River Water Treatment Plant receives water that is frequently difficult-to-treat. This water requires very ...


    By IXOM Watercare

  • Analysis of Organophosphorus and Organonitrogen herbicides in water using GC/MS with selected ion recording

    Laboratories monitoring trace level pesticides and herbicides by gas chromatography/mass spectrometry (GC/MS) frequently utilize Selected Ion Recording (SIR) techniques to maximize analytical sensitivity for quantification. With analytical standards, precision is limited to a large extent only by the autosampler and other instrumental effects. However, real-world samples pose a greater challenge. ...


    By PerkinElmer, Inc.

  • Determination of VOCs in water using static headspace GC/MS with simultaneous full scan and selective ion recording

    The combination of static headspace sample introduction and gas chromatography/mass spectrometry (HS/GC/MS) provides the analyst with a powerful, fully automated technique for the determination of trace volatile organic compounds (VOCs) in water. Samples may be hermetically sealed in the headspace vial at the point of sampling. This approach avoids errors due to glassware cross-contamination and ...


    By PerkinElmer, Inc.

  • Introduction to Ion Exchange Part 1

    IMPURITIES IN WATERWater is often referred to as the 'universal solvent' as it will dissolve small amounts of everything it touches. Water collects or dissolves a variety of mineral salts, organic compounds and suspended solids as it flows over the earth's surface and through the ground. These impurities make water undesirable for use in many applications. It is, therefore, important to ...


    By Kinetico Incorporated

  • Technical and Economic Evaluation and Selection of Sulfate Ion Removal Technologies for Recovery of Water from Mineral Concentrate Transport Slurry

    This paper presents the findings of a comprehensive evaluation for a Primary Mineral Processing (PMP) company that contracted Battelle to identify economical technology to remove sulfate ion (SO4 2-) from mineral slurry transport (MST) water, now disposed of as a waste, for reuse or sale. MST water is separated from product by dewatering a sulfidic mineral concentrate slurry prior to loading and ...

  • A polyvinylchloride-based cadmium ion-selective electrode using [Mo2(OAc)2(H2-calix[4]arene)] as an electroactive material

    A highly electroactive material Mo2[(OAc)2(H2-calix[4]arene)] is used as a neutral carrier for Cd2 +  ions in this paper. The membrane is fabricated by using ionophore [Mo2(OAc)2(H2-calix[4]arene)]:poly(vinyl chloride) (PVC): dibutylphthalate(DBP):sodium tetraphenyl borate (NaTPB) in the ratio of 40:300:470:5 respectively and tetrahydrofuran (THF) used as a solvent. The membrane electrode ...


    By IWA Publishing

  • Oligonucleotide-based fluorescence system for sensitive and selective detection of Ag(I) ions in aqueous solution

    In this letter, a new homogeneous assay with high sensitivity and selectivity was developed for the detection of silver ions in aqueous media at room temperature by using EvaGreen (EG), polycytosine oligonucleotide C20 and single-walled carbon nanotubes (SWNTs). The fluorescence of EG is weak in the absence or presence of randomly coiled C20. After C20 interacted specifically with Ag+ ions ...


    By IWA Publishing

  • Sorption of heavy metals by modified chelating ion exchangers

    Satisfactory sorption capacity towards heavy metals of several physically modified chelating resins at low pH is reported. It was found that the linear sorption isotherms are the most appropriate for describing the sorption of Ni and Pb. The data obtained revealed that the chelating resins studied are able to remove selectively copper from a complex synthetic solution containing Fe, Mn and Pb. ...


    By Inderscience Publishers

  • Adsorption of molybdate ion by natrolite and clinoptilolite-rich tuffs

    Natural clinoptilolite-rich tuffs and natrolite from Iranian deposits and their different ion-exchanged forms were used for the adsorption of 99Mo as molybdate ion. The effect of pH, contact time, initial molybdate concentration, and some cationic and anionic interferences were also studied. To investigate the selectivity of zeolites and their exchanged forms, the isotherms of ...


    By Inderscience Publishers

  • Electrolytic denitrification with an ion-exchange membrane in groundwater

    Nitrate contamination of groundwater is an important issue in rural areas. In this study, an electrolytic method for the denitrification of groundwater was investigated in a laboratory reactor. We used an ion-exchange membrane, employing a titanium oxide anode and five kinds of cathode for the investigation. The nitrate removal efficiencies with Cu, Pb, Ti/Ir/Ru, Ti/Ir/Ta, and Zn cathodes were ...


    By IWA Publishing

  • Hyphenated techniques as modern detection systems in ion chromatography

    Ion chromatography (IC) with conductivity detection has been successfully used to analyze low-molecular organic compounds such as amines and organic acids, as well as anionic and cationic substances. However, due to current toxicity concerns and the consequently lowered maximum contaminant levels (MCL), analyses in complex matrices require improved sensitivity and selectivity. The coupling of IC ...


    By Metrohm AG

  • Ion transport characteristics in nanofiltration membranes: measurements and mechanisms

    Ion transport characteristics during nanofiltration (NF) were investigated by measuring effective osmotic pressure and diffusivity experimentally. Effective osmotic pressure and diffusivity were measured through lab-scale transport and diffusion tests. First, it was shown that the water flux across NF membranes decreased dramatically with increasing ionic strength because of the noticeable ...


    By IWA Publishing

  • CO2 adsorption over ion-exchanged zeolite beta with alkali and alkaline earth metal ions

    The need to reduce anthropogenic CO2 emissions has been the driving force to consider new approaches and novel ideas for CO2 management, and carbon capture and storage (CCS) are considered to potentially be the most effective means to alleviate the problem. The most common method for CO2 capture is via gas absorption, with monoethanol amine (MEA) being the most widely used solvent. The current ...


    By Hiden Analytical

  • Investigation of the use of TiO2 doped with metal ions in water disinfection

    This research was conducted to improve titanium dioxide by transition metal doping using cooper. Sol gel method was used to prepare metal doped TiO2. Titanium isopropoxide and commercial TiO2 P25 were employed as catalyst precursor. The role played by the varied preparation parameters such as doping level and pH of solution discussed with respect to the final photoreactivity. Photoreactivity was ...


    By IWA Publishing

  • Imprinted polymers for the removal of heavy metal ions from water

    In wastewater treatment, the removal of heavy metals is difficult due to the limited affinity of heavy metal ions to ion exchange resins. Here imprinting polymerization is used to develop resins with high capacity and selectivity for heavy metal ions for water treatment. A random copolymer of methacrylate and methacrylamide was found to be most effective for the removal of hydrophilic metal ...


    By IWA Publishing

  • Adsorption of four perfluorinated acids on non ion exchange polymer sorbents

    Perfluorinated compounds (PFCs) have attracted global concern due to their ubiquitous distribution and properties of persistence, bio accumulation and toxicity. The process of adsorption has been identified as an effective technique to remove PFCs in water. Different non ion-exchange polymeric adsorbents were tested with regard to their sorption kinetics and isotherms at low PFCs concentrations. ...


    By IWA Publishing

  • The Desel System – Capacitive Deionization for The Removal of Ions From Water

    Capacitive deionization (CDI) represents a new approach to the treatment of a variety of water/wastewater streams contaminated with inorganic compounds. ENPAR Technologies Inc. of Canada has developed its DesEL System, which combines high water recoveries with high ion removal efficiencies. The system operates on the principle of capacitive deionization to remove ionic compounds referred to as ...

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