chemiluminescence Articles
-
Synthesis and characterization of a novel organic nitrate NDHP: Role of xanthine oxidoreductase-mediated nitric oxide formation
Abstract In this report, we describe the synthesis and characterization of 1,3-bis(hexyloxy)propan-2-yl nitrate (NDHP), a novel organic mono nitrate. Using purified xanthine oxidoreductase (XOR), chemiluminescence and electron paramagnetic resonance (EPR) spectroscopy, we found that XOR catalyzes nitric oxide (NO) generation from NDHP under anaerobic conditions, and that thiols are not involved ...
-
Automated techniques for real-time shipboard determination of dissolved trace metals in marine surface waters
This review compares methods that are currently employed for shipboard analysis of trace metals in seawater voltammetric, chemiluminescence and colorimetric methods. Instrumentation and methods are described for collecting surface seawater using pumping, with subsequent on-line analysis by stripping voltammetry. The review is illustrated with data for oceanic and coastal distributions of ...
-
BLUE LIGHT CONVERTER SIGNALS WAY FORWARD FOR NO2 MEASUREMENT
Local authorities seeking more accurate NO2 readings should consider using analysers which incorporate ‘Blue Light Converters’ says air quality monitoring specialists Enviro Technology. This comment comes following a presentation held at the Royal Society of Chemistry / AAMG Conference in December 2010 by EMPA (Switzerland) – an independent research and services institution ...
-
Measurement of temperature gradients through local extinction using Raman scattering spectroscopy
Measurements of temperature in laminar flames with localised extinction points were made using line imaging of spectrally resolved laser Raman scattering through the extinction process. A fit to the nitrogen scattering spectrum was used to determine temperature with an accuracy of 30 K. Temperature gradients through the extinction process were measured as the flame strength prior to extinction ...
-
Special price offered for the new NO2 CAPS AS32M analyzer
New: the AS32M analyzer – approved by the US EPA – gets the TÜV certification for the measurement of NO2. Providing accurate and very precise measurments, this analyzer will really simplify your life: for this reason, for any AS32M order placed till March the 1st 2013, special price conditions are offered: please contact us! To alleviate the potential disadvantages of the ...
By ENVEA
-
Chemiluminescent examination of abiotic oxidative stress of watercress
Watercress (Nasturtium officinale) is an aquatic plant that readily bioaccumulates heavy metals that may be found in contaminated aquatic systems. Toxic effects of contaminants on the physiological processes cause changes in oxidase enzymatic activity in watercress, which can be measured with a luminometer. The luminometer uses the reaction produced when peroxidases break down hydrogen ...
-
Measurement of ambient NH₃ over Bay of Bengal during W_ICARB campaign
Abstract Concentrations of ambient NH3, NO, NO2 and SO2 were measured over Bay of Bengal (BoB) during 28 December 2008 to 25 January 2009 to study their diurnal variation and relationship of NH3 with other trace gases over BoB. The measurements were done under the winter phase of Integrated Campaign on Aerosols and Radiation Budget (W_ICARB). For the first time, ambient NH3 was monitored ...
-
Chemiluminescent examination of abiotic oxidative stress of watercress
Watercress (Nasturtium officinale) is an aquatic plant that readily bioaccumulates heavy metals that may be found in contaminated aquatic systems. Toxic effects of contaminants on the physiological processes cause changes in oxidase enzymatic activity in watercress, which can be measured using a luminometer. The luminometer uses the reaction produced when peroxidases break down hydrogen ...
-
Transition metals cobaltites spinel for depollution of NOₓ emissions using SCR technology
Abstract The catalytic performance of various transition metal (M = Cu, Mn, and Ni) cobaltites prepared by nanocasting method were investigated for the selective catalytic reduction (SCR) of NO under lean burn conditions. KIT-6 was used as a hard template in the nanocasting method for preparation of catalysts. The catalyst samples were characterized by various techniques such as XRD, ...
-
Impurity detection in Nitrous Oxide (N2O) manufacturing in the Chinese Semiconductor market by ECO PHYSICS’s nCLD844CMhr N2O edition
“Special gases” consist of high-purity, electronic and standard gases. Especially the electronic gases are a vital raw material for the electronic industrial production, such as integrated circuits, display devices or solar cells. Besides being a weak anesthetic gas, for instance in the context of dentistry, Nitrous Oxide (N2O) is also essential for the Semiconductor production ...
-
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 of ...
-
Eclox Rural Water Association Helps Assure Water Security Statewide with Rapid Response Water Test Kit
The ability to rapidly monitor the quality of U.S. source water for contamination has never been more important than it is in today’s security-sensitive environment. The Delaware Rural Water Association (DRWA), located in Milford, Del., is a non-profit trade organization, one of 47 state affiliate members of the National Rural Water Association. The mission of the DRWA is to improve the quality ...
-
Continuous Emissions Monitoring Equipment – Guidance & Selection
There has never been such a wide range of analysers and systems available for continuous emissions monitoring as there is today. In the UK there are over 12 manufacturers and distributors offering CEMS (continuous emissions monitoring systems) using a variety of technologies including UV and IR absorption, FTIR, DOAS, chemiluminescence and photoacoustic spectroscopy (PAS). The majority of CEMS ...
-
Analytik Jena AG: 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 of catalyst ...
-
Total Nitrogen and Total Organic Carbon Analysis by High Temperature Combustion
Abstract Modern High Temperature Combustion (HTC) technology with Chemiluminescence detection (CLD) provides a fast and efficient way to monitor nitrogen loading by Total Nitrogen (TN) analysis. Nitrogen monitoring can be an integral function for the process control of wastewater treatment and other industrial applications, including seawater analysis. Due to the fact that TN analysis can be ...
-
Six Liquid Chromatography Detectors That Analytical Researchers Should Know
Pharmaceutical analysis is the application of analytical chemistry in pharmacy. It is a "method science" for the research and development of drug quality control. It mainly uses chemical, physical-chemical, or biochemical methods and techniques to study chemical structures that have been clarified. UV-Vis Absorption Detector Ultraviolet-visible detector (UVD) is one of the most widely used ...
-
Why measuring the ambient NO2 without conversion?
Nitrogen oxides NOx are pollutants that may have particular impact in terms of greenhouse gases, acidifying air etc ... issuance increased significantly since 1950 with the massive development of transport and industries. It therefore becomes necessary to provide measures always safer these pollutant gases, and to know the reliability of results. Currently, 60% of emissions of NO and NO2 are ...
By ENVEA
-
Field Method Comparison between Passive Air Samplers and Continuous Monitors for VOCs and NO2 in El Paso, Texas
This study evaluates the performance of Model 3300 Ogawa Passive Nitrogen Dioxide (NO2) Samplers and 3M 3520 Organic Vapor Monitors (OVMs) by comparing integrated passive sampling concentrations to averaged hourly NO2 and volatile organic compound (VOC) measurements at two sites in El Paso, TX. Sampling periods were three time intervals (3-day weekend, 4-day weekday, and 7-day weekly) for ...
-
Chemiluminescence detection for nitrogen containing compounds compared to other approved techniques
Abstract Nitrogen monitoring is important for process control, regulations, and economic reasons. There are several techniques that can be used to monitor nitrogen, some of which can be time consuming, labor intensive, and may have waste disposal concerns. This study examines using a high temperature combustion (HTC) Total Organic Carbon (TOC)/Total Nitrogen (TN) Analyzer with chemiliumunescence ...
-
Popular analysers are portable and rentable
The MCERTS approved HORIBA PG-250 has been one of the most popular instruments in Ashtead Technology’s fleet of rental equipment for a number of years. Jay Neermul, the company’s Environmental Product Manager says “This is because it is able to analyse CO, NO/NOx, SO2 and CO2 using standard reference methods in a portable instrument that can be easily and safely transported ...
Need help finding the right suppliers? Try XPRT Sourcing. Let the XPRTs do the work for you