kjeldahl-n measurement Articles

  • 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

  • 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

  • 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

  • Measuring TOC in Brine Solutions

    In the chlor-alkali and electrolysis industries, as well as many others, there is a need to analyze for TOC in samples containing high salt concentrations. These samples can range from sea water, which is typically 3% salt, up to brine solutions containing 28% salt. Shimadzu’s TOC-L with the high salt kit (P/N 638-93176-01 for N model & P/N 638-93176-02 for H model) is well suited for ...

  • Dissolved Organic Nitrogen Measurement in Reclaimed Water

    Dissolved organic nitrogen (DON) is an emerging concern for wastewater reclamation and reuse communities since DON may react with disinfectants to form carcinogenic nitrogenous disinfection byproducts (DBP) (e.g., haloacetonitriles, N-nitrosodimethylamine (NDMA)) and to affect the speciation of currently regulated DBP (trihalomethanes and haloacetic acids). Also, DON is present in proteins that ...

  • Distributed Measurements Unlock the Future of Design

    The next generations of materials and design will require sensing technologies that can monitor beyond the scope of point sensors such as thermocouples and strain gauges. New sensing platforms based on optical fibers can obtain spatially continuous, real time data, giving developers detailed insight across broad areas into how their materials and designs behave. Such systems also can sense ...


    By Sensuron

  • Developing a Novel Device for Accurate Biogas Concentration Measurement

    Due to increasing awareness on the impact of fossil fuels on the environment, and heavier taxes on carbon emissions there is a worldwide effort to seek renewable sources of energy – alternative energy sources that increase energy efficiency and security.  A renewable source that’s gained significant attention in recent years is biogas, one of the most ...


    By Edinburgh Instruments Ltd

  • Measuring the Dispersion Coefficient with Acoustic Doppler Current Profilers

    Abstract: A method is evaluated for estimating the longitudinal dispersion coefficient K from velocities and bathymetry measured with an acoustic Doppler current profiler #1;ADCP. If shear dispersion controls the mixing, the dispersion coefficient can be estimated from measurements of velocity and depth in a cross section. The dispersion coefficient has typically been measured by costly and ...


    By Teledyne RD Instruments

  • Ferrous Wear Metal Measurement Made Easy with the FerroCheck

    Historically, one of the most cost-effective indicators of machinery health has been the analysis of ferrous debris in oil. Such analysis utilizes the ferromagnetic properties of generated debris to perform the analysis. Since nearly all wear debris contains ferrous material (in particular iron), an abnormal increase in the amount of debris can be directly correlated to abnormal machinery ...


    By Spectro Scientific

  • Why Levelized Cost of Electricity is an important measurement in wind

    As the wind industry continues to grow, it is faced with much opposition, and a lot of misinformation is being shared. Some of the biggest myths around wind is that the costs of building and installing wind turbines are too high (compared to the costs of other energy sources) and that the industry is overly subsidized. Many anti-wind lobbyists point out that subsidies and tax benefits are the ...


    By Orenda Energy Solutions Ltd.

  • 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

  • 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

  • Laboratory measurement and modelling of coal permeability with different gases adsorption

    Adsorption of gas on coal will induce coal matrix swelling. Under reservoir conditions these strain changes affect the coal permeability. A series of laboratory measurements of gas permeability of a coal sample from Qinshui basin has been conducted, using a new apparatus developed for measuring coal permeability with various gases adsorption, by use of the transient pulse decay technique. Results ...


    By Inderscience Publishers

  • Improvement of olfactometric measurement accuracy and repeatability by optimization of panel selection procedures

    The EN 13725:2003, which standardizes the determination of odour concentration by dynamic olfactometry, fixes the limits for panel selection in terms of individual threshold towards a reference gas (n-butanol in nitrogen) and of standard deviation of the responses. Nonetheless, laboratories have some degrees of freedom in developing their own procedures for panel selection and evaluation. Most ...


    By IWA Publishing

  • Efficiency of Process Measurement Technology for Determining Nutrient Parameters – Yesterday, Today and Tomorrow

    Abstract The costs and benefits of process measurement instruments in sewage treatment plants were the subject of intensive debate in the 1990s. Cost-benefit studies, comparing the potential savings in energy, consumables and personnel with the additional costs of using the instruments, resulted in recommendations specifying the minimum sewage treatment plant size at which the use of such ...


  • Comparing Functional Assessments Of Wetlands To Measurements Of Soil Characteristics And Nitrogen Processing

    Abstract: One beneficial service of wetland ecosystems is the improvement of water quality through nitrogen (N) removal. However, one important N-removal process, denitrification, can produce the atmospheric pollutant nitrous oxide (N2O). Wetland biogeochemical functions, such as N processing, can be assessed by the hydrogeomorphic (HGM) approach using a suite of simple field observations made ...


    By ENVIRON

  • Rock Porosity Determinations Using Particle Densities Measured in Different Fluids

    Rock porosity, when calculated from measurements of bulk and particle rock density, is found to depend on the method used to determine these densities. The particle density, which is found experimentally, varies with the immersion fluid used; hence, the porosity determined depends on it, too. Organic fluids are recommended in standards for describing particle density for special applications; ...


    By ASTM International

  • peCOD is the New NOM Monitoring Tool for Measuring Organic Reactivity - Case Study

    Natural organic matter (NOM) is a critical parameter for measuring drinking water quality.  Levels of NOM are associated with taste, odour, colour, chemical treatment dosage, and disinfectant by-product (DBP) formation.  There are several tools accepted by drinking water quality experts which are used to evaluate NOM: total organic carbon (TOC), dissolved organic carbon (DOC), UV254, ...


    By MANTECH

  • Explaining vehicle emissions – why do laboratory and road measurements differ?

    The road transport sector is a major contributor to Europe’s emissions of greenhouse gases and air pollution. For certain pollutants, vehicles can emit substantially higher emissions on the road than official emissions tested in laboratories. A report released today by the European Environment Agency (EEA) provides a non-technical guide that describes the reasons for these often significant ...


    By European Commission

  • Are Those Inexpensive iPad Sound Measurement Apps Any Good?

    Are those inexpensive iPad sound measurement apps any good? Are they as accurate as a properly calibrated $2,000 type 2 sound level meter? Let's review three separate studies, and an article: Study #1 In early 2014, NIOSH reviewed 192 sound measurement apps. NIOSH concluded, ...

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