kjeldahl-n Articles

  • TKN/Ammonia in Water & Wastewater by Steam Distillation

    The determination of total Kjeldahl Nitrogen (TKN) in water and waste water is a routine procedure used to ensure water quality. A simple and fast procedure for TKN determination as described in ISO 5663-1984, EPA 351.3, and AOAC 973.48 regulations, is introduced below. The sample is digested with sulfuric acid using the SpeedDigester K-436 or K-439, followed by distillation and titration with ...


    By BÜCHI Labortechnik AG

  • Expert Installation Services Soar to New Heights

    Along with providing equipment to solve customer’s complex VOC, NOx, and Odor pollution challenges, we also provide installation services. I was on site for the recent “lift” of a new QUADRANT SR-35,000 Thermal Oxidizer (TO). Capital equipment, like a Thermal Oxidizer, is designed to operate for many years; however wear and tear eventually may require the equipment to be ...

  • Kuriverter IK-110 effect in SWRO plant Extraordinary biofouling reduction - Case Study

    Learn how Kuriverter IK-110 successfully improves biofouling and decreases operation costs in a SWRO plant. ...


    By Kurita

  • Heat Recovery Steam Generators (HRSG) & Blowdown Pump Stations

    Romtec Utilities engineers and supplies pump stations for many different applications for industrial facilities across the country. These facilities range from chemical manufacturing to oil & gas refineries, and power generation is another industrial market where Romtec Utilities excels. We have supplied many different types of pumping systems for power gen facilities for wastewater, ...


    By Romtec Utilities Inc.

  • United States Coast Guard (USCG) Implements Handheld Technology for Onboard Oil Testing in New Cutters - Case Study

    With a motto of “Always Ready,” the United States Coast Guard (USCG) has 11 missions specified by law including drug and migrant interdiction; ports, waterways and coastal security; fishery patrols; search and rescue; and national defense. The USCG’s newest ships include 22 Fast Response Cutters (FRCs) which recently entered service, and 36 more are currently on order. ...


    By Spectro Scientific

  • Minimum Total Harmonic Distortion on board Scandlines New Hybrid Ferries Berlin & Copenhagen - Case Study

    In 2016, Scandlines inaugurated two new hybrid ferries for the Rostock-Gedser route. In order to improve the power quality, Scandlines installed active filters on board M/V Berlin and M/V Copenhagen. Before commissioning, Scandlines’ new hybrid ferries had a power quality of THDV 15%. In order for the ferries to go into operation, the power quality had to be reduced to below 8 ...


    By DESMI A/S

  • Quality assurance and Quality control technical note

    Introduction For almost 50 years HYDROLAB products have provided dependable sensor technology in a multiple parameter instrument for montioring essential indicators required for assessing water quality in natural waters. Useable data are the lifeblood of any environmental water quality monitoring program and variation in measurement processes impairs the quality of the data that water ...


    By The OTT Hydromet Group

  • Overview of Using Lead Through the History

    Various sources assumed the share of guilt in the fall of the Roman Empire due to the use of the lead pipe, Devonshire colic in the 18th century, poisoning from the addition of lead acetate to wine and pediatric lead poisoning. Not only production but also the use of pottery for centuries caused poisoning among the population. When a piece of pottery covered with lead glaze is not heated enough, ...


    By Lumex Instruments Group

  • 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

  • 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

  • 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

  • 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

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