chromatography analysis Articles
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Estimation of fission gas release in FBTR fuel pins
Fission gas extraction and analysis has been carried out on fuel pins of fast breeder test reactor subassemblies at different burn-ups as a part of post-irradiation examinations to characterise the performance of the unique mixed carbide fuel and estimate the residual life. This paper describes in detail the fission gas extraction and analysis carried out on fuel pins after various stages of ...
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Investigation of photo-assisted and crude peroxidase mediated transformations of chlorinated phenols (CPs) from spiked and industrial wastewaters: identification of reaction products
This work focused on photo-assisted crude peroxidase mediated transformations of chlorinated phenols (CPs) from spiked and industrial wastewaters and the identification of reaction products formed. Garden radish Raphanus sativus was the source of crude peroxidase. No chlorine bearing compounds were detected by gas chromatography-high resolution mass spectrometry analysis. Under identical test ...
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Nitrite interference and elimination in diphenylcarbazide (DPCI) spectrophotometric determination of hexavalent chromium
Cr(VI) is highly noted as a carcinogenic, mutagenic, and teratogenic pollutant. However, accurate determination of Cr(VI) in aqueous samples is difficult using the conventional diphenylcarbazide (DPCI) spectrophotometric method upon being interfered by co-existed nitrite. This paper illustrates how to eliminate the nitrite influence in a simple but efficient method based on a detailed analysis ...
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Effect of trihalomethanes (chloroform and bromoform) on human haematological count
With the increasing concerns about the harmful effects of disinfection products, the process of chlorination is becoming questionable. Bromoform and chloroform are among the most frequently occurring disinfection by-products. Haematological parameters are an important indicator of human well-being which is why the prime objective of the current study was to conduct a dose–response assessment ...
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Sewage sludge and waterworks sludge stabilization in sludge treatment reed bed systems
In this study, results about sludge stabilization in sludge treatment reed bed (STRB) systems in two different systems, Hanningfield STRB 1 (England), treating waterworks sludge, and Stenlille STRB 2 (Denmark), treating surplus activated sludge, are presented. The study mainly focused on the effectiveness of the STRBs systems in stabilizing sludge organic matter; in fact, parameters ...
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Successful treatment of high azo dye concentration wastewater using combined anaerobic/aerobic granular activated carbon-sequencing batch biofilm reactor (GAC-SBBR): simultaneous adsorption and biodegradation processes
The application of a granular activated carbon-sequencing batch biofilm reactor (GAC-SBBR) for treatment of wastewater containing 1,000 mg/L Acid Red 18 (AR18) was investigated in this research. The treatment system consisted of a sequencing batch reactor equipped with moving GAC as biofilm support. Each treatment cycle consisted of two successive anaerobic (14 h) and aerobic (8 h) reaction ...
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Thermal lens spectrometric determination of ammonium in water samples based on indophenol formation with sodium salicylate
For the first time, a thermal lens spectrometric (TLS) detection was applied for the determination of ammonium based on indophenol blue reaction. The blue–coloured indophenol was detected following excitation by a krypton laser at 647 nm. The achieved limit of detection (LOD) and limit of quantification (LOQ) were 8 ng/mL and 25 ng/mL, respectively. This represents an improvement of 20 times when ...
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Plant uptake of diclofenac in a mesocosm-scale free water surface constructed wetland by Cyperus alternifolius
This study aimed to assess the uptake of diclofenac, a widely used nonsteroidal anti-inflammatory pharmaceutical, by a macrophyte Cyperus alternifolius in a mesocosm-scale free water surface (FWS) constructed wetland. Quantitative analysis of diclofenac concentrations in water solution and plant tissues was conducted by high performance liquid chromatography analysis after sample ...
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Scottish Company Peak Scientific offer solutions to the world helium shortage
Recent international studies have confirmed that the world will run out of helium gas in 25 years if current usage remains unchecked. As well as concerns for the future the gases scarcity has seen its price rise by 70% in recent years. Used in a multitude of applications such as cryogenic applications, purging/pressuring, welding cover gas and controlled atmosphere testing, demand for helium gas ...
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Fast screening for adsorbable organically bound halogens
Metrohm Combustion IC – a validated all-in-one solution for comprehensive AOX determination (AOF, AOCl, AOBr, AOI) according to DIN 38409-59 Organohalogen compounds are widespread, persistent, and potentially toxic for humans and the environment. However, the techniques commonly used to monitor adsorbable organic halogens (AOX) can only determine the sum of organically bound chlorine, ...
By Metrohm AG
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High Throughput LC-MS-MS Analysis of Carbendazim in Orange Juice
Highly sensitive analytical methods are necessary to prevent contaminated produce from entering the food supply. In order to help move fresh imports through customs without delay, methods must be rapid and cost effective, in order to test imports thoroughly. LC-MS offers the highly sensitive, robust measurement needed, while ultra high performance liquid chromatography enables high speed ...
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Photolytic degradation of chlorophenols from industrial wastewaters by organic oxidants peroxy acetic acid, para nitro benzoic acid and methyl ethyl ketone peroxide: identification of reaction products
In this investigation, chlorophenol (CP) containing industrial wastewater was remediated by ultraviolet irradiation in conjunction with organic oxidants, peroxy acetic acid (PAA); para nitro benzoic acid (PNBA); and methyl ethyl ketone peroxide (MEKP). CP mineralization was studied with regard to chemical oxygen demand (COD) and chloride ion release under identical test conditions. COD ...
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Enhanced biodegradation of oily wastewater through nuclear irradiation mutation and statistical experimental methodology
This study presents the improved biodegradation of crude oil in aqueous phase using mutant Dietzia sp. obtained by random mutagenesis of wild Dietzia sp. using 60Co-γ irradiation. The mutants obtained were screened based on their degradation performance and the best mutant was selected for oil degradation optimization research. A four factor central composite design coupled with response ...
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HPLC prep - which filter fits your chromatography sample best?
Sample filtration protects your HPLC column and preserves data quality. Read our tips on filter and solvent selection and the use of tools to save time in HPLC prep, improve lab efficiency, and better your analytical chemistry techniques. Filtering samples prior to high-performance liquid chromatography (HPLC) analysis can help avoid frit clogging while maintaining data quality. Adding a ...
By Cytiva
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Investigation of UV-assisted chlorophenol congeners’ degradation by organic oxidant
p -nitrobenzoic acid in basic mediaThis research specifically addressed the photodegradation of selected model chlorophenol (CP) congeners, 4-chlorophenol (4-CP), 2,4-dichlorophenol (2,4-DCP), 2,4,6-trichlorophenol (2,4,6-TCP) and pentachlorophenol (PCP), by an organic oxidant, p-nitrobenzoic acid (PNBA), in basic media. The reactions were followed by high-pressure liquid chromatography and gas chromatography–mass ...
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Innovations in Site Characterization. Case Study: Dexsil L2000 PCB/Chloride Analyzer for Drum Surfaces
Executive Summary This case study describes a field analytical method that was used to measure PCB surficial contamination in empty drums to be cleaned by a new process. Approximately 7,000 empty 55-gallon drums that previously contained PCB-contaminated material had accumulated at the Department of Energy (DOE)’s East Tennessee Technology Park in Oak Ridge, TN. Because disposal of these drums ...
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What is electrochemical detection and what are its applications?
Electrochemical detection (ECD) for HPLC or UHPLC / UPLC is an extremely selective and sensitive detection technique that is applied in several analyses such as the neurotransmitters dopamine, serotonin and noradrenalin, or analytes such as 5HIAA, catecholamines and metanephrines. ECD has an enormous linear dynamic range of more than 6 orders of magnitude. This means that concentrations can be ...
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Common element test methods
1. Infrared absorption spectrometry Analysis principle: absorption of infrared light energy, causing vibration and rotational energy level transition of molecules with dipole moment change Representation of spectrum: relative transmitted light energy varies with transmission light frequency Information provided: the location, intensity and shape of the peaks, and the characteristic vibrational ...
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Monitoring PFAS in water sources
Non-targeted adsorbable organically bound fluorine (AOF) analysis by CIC Per- and polyfluorinated alkyl substances (PFASs) are thousands of organic molecules in which all the hydrogen atoms on at least one carbon are replaced by fluorine [1]. PFASs are widely used in different industries, e.g., as surfactants for film-forming foams or as impregnating agents for packaging [2]. Due to ...
By Metrohm AG
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Using anion chromatography–pulsed amperometry to measure amino compounds in dairy manure-amended soils
Amino acids and amino sugars comprise the bulk of soil N, so information on their chemical forms and cycling patterns should enable better understanding of soil N cycling. In this study of soil samples that had received animal manure, we evaluated the capabilities of a recently developed analysis for soil amino compounds (19 amino acids, two amino sugars) that consists of methanesulfonic acid ...
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