kjeldahl-n Articles

  • Development and Application of Oxygen Demand Testing using Industrial Effluent - Case Study

    Abstract The purpose of this study is to develop capacity and protocols for oxygen demand testing that can be used for instruction and research within the BioScience Technology program. For application purposes we chose the PeCOD® Analyzer which offers a unique nanotechnology-based approach to Chemical Oxygen Demand (COD) analysis. Background ...


    By MANTECH

  • Using Anaerobic Biomass Digestion to Produce Hydrogen and Biofuel

    For many years, hydrogen has been considered as an alternative to fossil fuels. Now, Scientists are aiming to develop an environmentally friendly method to produce hydrogen from biomass by optimizing anaerobic digestion systems.1 Climate change, dwindling fuel resources and energy prices have spearheaded intensive efforts to detect and optimize ...


    By Edinburgh Instruments Ltd

  • Selective nitrogen determination methods related to Kjeldahl

    KjelMaster System K-375 / K-376, KjelDigester K-449, Scrubber K-415 85 % of the world’s nitrogen demand for fertilizer is primarily derived from ammonia in the form of urea, ammonium nitrate, phosphate and sulfate. Ammoniacal components can also be found in soil, sludge and bio waste. In those sample matrices, a mixture of several nitrogen containing compounds as urea, nitrogen from ...


    By BÜCHI Labortechnik AG

  • How to Achieve Low Detection and Quantification Limits for the Nitrogen Determination with Kjeldahl

    Kjeldahl is one of the most commonly used techniques to determine the protein content in food and feed samples or the nitrogen content in soil, sludge, and water samples. The detection and quantification limits are important characteristics of analytical methods. The impact of the concentration of boric acid, the addition of potassium chloride, and the concentration of the titration solution on ...


    By BÜCHI Labortechnik AG

  • TKN determination in water and waste water (Total Kjeldahl Nitrogen)

    Colorimetric determination of TKN (Total Kjeldahl Nitrogen) in water and waste water according to the Kjeldahl method The determination of TKN (total Kjeldahl nitrogen) in water and waste water is a routine procedure for quality assurance and inspection. Here, a reliable procedure for the colorimetric TKN determination in water, according to ISO 5663, AOAC 973.48, and EPA 351.3 is ...


    By BÜCHI Labortechnik AG

  • Synthesis and properties of B-C-N related nanomaterials

    C-N related nanomaterials have many interesting properties originating from their unique and changeable structure. In this paper, we present the synthesis techniques and properties of the B-C-N related nanostructures mainly including B-C-N nanotubes and carbon nanoparticles. The electronic properties of the ternary B-C-N nanotubes were experimentally controlled by controlling their structure and ...


    By Inderscience Publishers

  • Compensation Flow Gauge, N Wales case study

    Dwr Cymru Welsh Water Design, supply and installation of a compensation flow gauge at Cwmystradllyn Reservoir, North Wales. 2006 Hydro-Logic have been engaged by Dwr Cymru/Welsh Water since 2000 to operate, maintain and improve their hydrometric network. One of the projects involved the feasibility, design and installation of a new ultrasonic transit-time flow gauge on the discharge compensation ...


    By Hydro-Logic Services

  • Assessing n–order dependencies between critical infrastructures

    The protection of critical infrastructures (CI) is a complex task, since it involves the assessment of both internal and external security risk. In the recent literature, methodologies have been proposed that can be used to identify organisation–wise security threats, or even first–order dependency risk (i.e., risk deriving from direct dependencies). However, there is a lack of work ...


    By Inderscience Publishers

  • Flexibility beyond any limits - multi N/C

    With a multi N/C analyzer the parameters TOC, NPOC, POC, TC, TIC and TNb  can be measured quickly, easily and without any conversion. This is possible thanks to the perfect combination of an efficient sample digestion technology, VITAFlow Management System and Focus Radiation NDIR detector. TOC and TNb  are measured truly simultaneously, with a single injection and without any exchange ...


    By Analytik Jena AG

  • N-butane partial oxidation to maleic anhydride under transient regimes

    Maleic anhydride (MA) is commercially produced from partial oxidation of n-butane by air over vanadium pyrophosphate (VPP) catalyst. There has been a huge research interest to better understand the different aspects of this industrially attractive reaction including mechanism, dynamic catalyst phase evolutions as well as the effect of redox operating conditions such as gas/solid residence time, ...


    By Hiden Analytical Ltd.

  • Correlations between surrogate nitrogenous organic precursors and C-, N-DBP formation

    Nitrosamines have been emerging as disinfection byproducts in drinking water using source water impacted with domestic wastewaters. Nitrogenous organic compounds are suggested as precursors of nitrosamines, but many of them have not been identified. This study investigated the correlations between nine selected nitrogenous organic compounds with different characteristics and corresponding ...


    By IWA Publishing

  • Application of a Medium Pressure UV System for the Treatment of N-Nitrosodimethylamine (NDMA)

    N-nitrosodimethylamine (NDMA) was first detected in 1990 as a problem pollutant in drinking water wells at levels as high as 3,000 ppt in Elmira, Ontario, Canada. The waste from a large chemical plant over many years had led to the contamination of the drinking water wells for the community. After extensive evaluation and testing, it was determined that UV photolysis was the most effective ...

  • Case study - N°NG2 – Natural gas monitoring – energyMedor

    Context & Challenges How to analyze H2S, mercaptans and/or THT for detecting the odor of the gas with the ability to have total organic sulfur calculation in a metering station? Chromatotec Solutions Instrument: energyMedor energyMedor is able to analyze H2S, mercaptans and/ or THT in addition to the calibration ...


    By Chromatotec Group

  • Case study - N°NG1 – Natural gas monitoring – Medor Exp

    Context & Challenges Natural gas used for household consumption typically contains odorant sulfur components for safety reasons. As natural gas is normally odorless, the sulfur components are artificially added. When natural gas is transported between various companies, regions or countries, gas companies have to verify that the sulfur species are present as specified. ...


    By Chromatotec Group

  • The kinetics of carbon dioxide capture by solutions of piperazine and N-methyl piperazine

    In this paper, kinetics and mechanism of the reaction between CO2 and piperazine (PZ) or n-methyl piperazine (NMP) in aqueous and alcoholic solutions were investigated using direct stopped-flow technique under a range of temperatures (278, 288 and 298 K). The results show that the reactions follow a single termolecular reaction mechanism and the reaction rate between CO ...


    By Inderscience Publishers

  • Transformations of n-alkanes from petroleum pollutants in alluvial groundwaters

    Abstract Investigations presented in this paper were aimed at defining the alterations of n-alkane composition in cases of oil-polluted alluvial sediments. Therefore, oil-polluted groundwater samples, taken in five different time intervals during a period of 28 months, were investigated. Samples of alluvial sediments were taken from two boreholes within an oil refinery at Pancevo, Yugoslavia. In ...


    By Springer

  • Efficient photoelectrochemical splitting of water to H2 and O2 at nanocrystalline carbon modified (CM)-n-TiO2 and (CM)-n-Fe2O3 thin films

    Carbon modified titanium oxide (CM-n-TiO2) and iron (III) oxide (CM-n-Fe2O3) thin films were synthesised by thermal flame oxidation of Ti and Fe metal sheets, respectively. Under white light illumination of intensity of 100 mW cm−2 from a 150 W xenon lamp, the optimised CM-n-TiO2 and CM-n-Fe2O3 photoelectrode were found to split water to H2 and O2 with maximum photoconversion efficiencies of ...


    By Inderscience Publishers

  • N-Tox® prevents activated sludge failure and monitors greenhouse gas emissions

    A new technique for evaluating nitrification efficiency in industrial and municipal activated sludge systems is described that uses direct measurement of dinitrogen oxide, an important greenhouse gas, as an indicator of nitrification failure. Developed at Water Innovate, N-Tox® helps control ammonia levels in treated effluent by providing an early warning of wastewater treatment failure. The ...


    By Clarity Authoring

  • High-Performance Liquid Chromatography for Determination of N-Nitrosodimethylamine in Water

    High-performance liquid chromatography (HPLC) was applied for aqueous determination of Nnitrosodimethylamine (NDMA). A fluorescence derivatization technique was adopted to enhance detection using HPLC. Derivatization with dansyl chloride was optimized for excitation and emission wavelengths (340 and 530 nm, respectively), pH (9-12), and concentration of dansyl chloride (500 mg/L). An instrumental ...

  • Biodegradation of plasticiser di-n-butyl phthalate by immobilised microbial cells

    Microorganisms capable of degrading Di-n-Butyl Phthalate (DBP) were isolated by acclimation and enrichment techniques. The adaptation of microorganisms to DBP was investigated. The microbial cells were immobilised onto the ceramic honeycomb supports. The DBP degradation was performed in a novel kind of bioreactor using ceramic honeycomb support as carrier for microbial immobilisation. The ...


    By Inderscience Publishers

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