nitrogen determination Articles

  • Nitrogen Determination in Tobacco

    Nitrogen Determination in Tobacco according to the Kjeldahl Method It is considered that flavour and taste of smoke is correlated with the nitrogenous constituents. Accordingto Indian Central Tobacco Reseach Institute (CTRI) fluecured tobacco containing 1.6 to 2.3 % total nitrogen gives the most satisfying smoke, whereas the acceptable limit of total nitrogen is 1.0-3.0 %. High ...


    By BÜCHI Labortechnik AG

  • Determination of Ammonia and Nitrogen

    Customer: CAE Grand Ouest, France CAE is a laboratory of the Veolia Group located in Western France. The laboratory is specializing in environmental analysis, especially in water and soil analysis. Application: Determination of Ammonia and TKN in waste water and soil Total Kjeldahl Nitrogen (TKN) and Ammonia are common parameters for the evaluation of ...


    By BÜCHI Labortechnik AG

  • A Critical Evaluation of the South African Air Quality Offsets Guideline

    There is wide recognition in South Africa to the link between the quality of life and quality of the air we breathe. The Department of Environmental Affairs (DEA) attempts to improve air quality through two key regulatory tools; emission limits, which regulate the maximum concentration of certain pollutants permissible within certain, ‘listed’ industrial stacks or vents, and ambient ...


    By WKC Group

  • 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

  • Nitrogen analysis of pharmaceutical excipients

    Customer: Butterworth Laboratories, United Kingdom Wilh nearly 40 years' experience, Butterworth Laboratories remains an independent UK con¬tract analytical service providing Method Development, Method Validation, Stability Testing and OC Testing to the pharmaceutical, medical device and chemical industries. They work in part¬nership with clients who not only recognize expertise ...


    By BÜCHI Labortechnik AG

  • TKN determination in water and waste water

    Determination of TKN (Total Kjeldahl Nitrogen) in Water and Waste Water according to the Kjeldahl Method. The determination of TKN in water and waste water is a routine procedure for quality assurance. A simple and fast procedure for the TKN determination in water, according to ISO 5663, AOAC 973.48 and EPA 351.3, is introduced below. The sample is digested with sulfuric acid and the ...


    By BÜCHI Labortechnik AG

  • An approach for determining urban concentration increments

    A simple approach for accurately estimating an urban concentration increment on top of the regional background for urban areas in Europe is presented. The method operates by establishing a functional relationship between the concentration increment and the local meteorological situation, the city characteristics, the urban emissions and the background concentrations. In the current study, the ...


    By Inderscience Publishers

  • How to Determine Aquatic Humic Substances

    Aquatic Humic Substances (AHS) result from the decomposition of plant and animal residues and are found in soil, sediment, and water. They are widespread in nature and are mostly comprised from naturally occurring dissolved organic matter in water. AHSs are an important component in water systems, particularly as they relate to the potential fate of chemicals in the aquatic environment. For ...


  • Dissolved organic Nitrogen: an overlooked pathway of Nitrogen loss from agricultural systems?

    Received for publication June 18, 2008. Conventional wisdom postulates that leaching losses of N from agriculture systems are dominated by NO3–. Although the export of dissolved organic nitrogen (DON) into the groundwater has been recognized for more than 100 yr, it is often ignored when total N budgets are constructed. Leaching of DON into stream and drinking water reservoirs leads to ...

  • Implementation of an automatic and miniature on-line multi-parameter water quality monitoring system and experimental determination of chemical oxygen demand and ammonia-nitrogen

    An automatic, miniature and multi-parameter on-line water quality monitoring system based on a micro-spectrometer is designed and implemented. The system is integrated with the flow-batch analysis and spectrophotometric detection method. The effectiveness of the system is tested by measuring chemical oxygen demand (COD) and ammonia-nitrogen in water. The results show that the modified system ...


    By IWA Publishing

  • Cuphea nitrogen uptake and seed yield response to nitrogen fertilization

    Cuphea (Cuphea viscosissima Jacq. x C. lanceolata W.T. Aiton, PSR23) is an oilseed crop that is a rich source of medium-chain fatty acids. Progress has been made on improving cuphea agronomically, but little is known about N fertility requirements for optimum cuphea production. The objective of this study was to determine the N necessary for maximizing seed yield and oil content. Experiment 1 was ...

  • Biodegradability of Dissolved Organic Nitrogen: Adaptation of the BOD Test

    To prevent eutrophication in receiving waters, many astewater treatment plants are being firected by regulatory agencies to achieve very low levels of total nitrogen (3-4 mg/L TN or lower) in the effluent. Dissolved organic nitrogen (DON) component is included within these total nitrogen limits. The regulations assume that DON is completely biodegradable, and therefore needs to be included in any ...

  • Algae biomass cultivation in nitrogen rich biogas digestate

    Because microalgae are known for quick biomass growth and nutrient uptake, there has been much interest in their use in research on wastewater treatment methods. While many studies have concentrated on the algal treatment of wastewaters with low to medium ammonium concentrations, there are several liquid waste streams with high ammonium concentrations that microalgae could potentially treat. ...


    By IWA Publishing

  • Modeling organic nitrogen conversions in activated sludge bioreactors

    For biological nutrient removal (BNR) systems designed to maximize nitrogen removal, the effluent total nitrogen (TN) concentration may range from 2.0 to 4.0 g N/m3 with about 25–50% in the form of organic nitrogen (ON). In this study, current approaches to modeling organic N conversions (separate processes vs. constant contents of organic fractions) were compared. A new conceptual model of ON ...


    By IWA Publishing

  • The effect of ammonia stress on nitrogen metabolism of Ceratophyllum demersum

    The objective of this paper was to determine the effect of total ammonia N concentration and pH on the N metabolism of Ceratophyllum demersum and to evaluate the stress caused by inorganic N enrichment in the water column on submersed macrophytes. In this experiment, pH values were carefully controlled to distinguish between the effects of un‐ionized NH3 and ionized NH4+. The results showed ...


    By John Wiley & Sons, Ltd.

  • CFD modelling of nitrogen injection in a longwall gob area

    This paper describes computational fluid dynamics (CFD) simulations conducted to investigate the effectiveness of N2 injection in an active panel and a sealed longwall gob area to prevent and suppress spontaneous heating of coal using various injection locations and flow rates. In the active panel simulations, a single longwall panel with a bleederless ventilation system was ...


    By Inderscience Publishers

  • Assessment of Nitrogen and Phosphorus Environmental Pressure at European Scale

    In surface water bodies, the increase in nutrient concentration above the natural background levels enhances the productivity, causing the phenomenon of eutrophication (Nixon, 1995). The euthrophication has been identified as a major cause of impaired water quality of rivers, lakes and estuaries (EEA, 2001; EEA, 1999; Carpenter et al. 1998; Meybeck, 1982). Agriculture is considered the main ...


  • A mesocosm study using four native Hawaiian plants to assess nitrogen accumulation under varying surface water nitrogen concentrations

    Accumulation of nitrogen (N) by native Hawaiian riparian plants from surface water was measured under a controlled experimental mesocosm setting. Four species, Cladium jamaicense, Cyperus javanicus, Cyperus laevigatus, and Cyperus polystachyos were tested for their ability to survive in coconut fiber coir log media with exposure to differing N ...


    By IWA Publishing

  • Organic amendment history and crop rotation effects on soil Nitrogen mineralization potential and soil Nitrogen supply in a potato cropping system

    Crop management practices influence readily and potentially available N in soil. In this study, we evaluated the effects of organic amendment history and crop rotation on potentially mineralizable N (N0), mineralizable N pools, and field estimates of soil N supply in potato (Solanum tuberosum L.) production, and evaluated a suite of N availability measures to detect changes in these parameters. ...

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