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Showing 1 to 14 of 14 for “"NDMA"”.
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Ndma Formation During Chloramination: Temporospatial Distribution Of Ndma Precursors, The Effect Of Lime Softening Treatment, And Precursor Identification Via Non-Targeted Analysis
N-nitrosodimethylamine (NDMA), a byproduct formed in drinking water during chloramination disinfection, is notorious both for its potent carcinogenicity and toxicity. NDMA and other nitrosamine precursors are compounds containing secondary, tertiary, and quaternary amines, which can be released …
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Effect of bromide ion on the formation of N-nitrosodimethylamine (NDMA) in waters treated with monochloramine
… on the formation of N-nitrosodimethylamine (NDMA) in chloraminated waters; (ii) to test different active bromine compounds in order to determine if they lead to the direct formation of NDMA as a result of reacting with an NDMA precursor; (iii) to develop a kinetic model to predict the …
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Biofilm-related Materials as Total N-nitrosamine (TONO) Precursors and Hydroxylamine-based Interferences in TONO and N-nitrosodimethylamine (NDMA) Measurements
… the SPE-TONO assay, with N-nitrosodimethylamine (NDMA) losses estimated to be 30% by SPE alone and an additional 15% from concentration of the methanol extracts by N2-gas blowdown. Three biofilm-derived materials - poly-N-acetylglucosamine (PNAG), Pseudomonas aeruginosa, and tryptophan - were …
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Ecological method development for detecting N-nitrosodimethylamine in water using HPLC-PDAD
… concentrations of N-nitrosodimethylamine (NDMA) in drinking water and environmental water samples. This presents a practical and “green” option to analytical methods that require laborious derivatization, expensive detectors and unecological solvents.</p> <p>Mobile phase characteristics, …
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Improvements to Polyamide Reverse Osmosis Membranes for Removal of Small, Neutral, Hydrophilic Solutes
… the carcinogen N-nitrosodimethylamine (NDMA). To do this, commercial RO membranes were modified using a variety of methods, the most successful of which was surface bonding of graphene oxide (GO) nanosheets. On average, membranes modified with GO nanosheets reduced NDMA permeability by …
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Cytotoxicity and Mutagenicity of Disinfection Byproduct Mixtures Formulated Using Free Chlorine and Monochloramine
… quantified. Exogenous N-nitrosodimethylamine (NDMA) was added to two monochloramine-derived concentrates because the NOM did not include precursors for this known human carcinogen that forms in chloraminated waters. Five synthetic DBP analog mixtures were formulated based on the profiles of the …
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Removal of Total Organic Carbon and Emerging Contaminants in an Advanced Water Treatment process using Ozone-BAC-GAC
… via nitrification. N-Nitrosodimethlyamine (NDMA) was formed in the treatment process by ozone, but was shown to be effectively removed by BAC. EBCT, temperature, ozone dose and presence of pre-oxidants, such as monochloramine, played an important role in determining the amount of NDMA …
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Development of sustainable Pd-based catalysts for removal of persistent contaminants from drinking water
… significantly but not N-nitrosodimethylamine (NDMA) with a variety of Pd-based catalysts. Nitrate was selected as a probe contaminant, and several different azo dyes (i.e., (methyl orange, methyl red, fast yellow AB, metanil yellow, acid orange 7, congo red, eriochrome black T, acid red 27, …
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Evaluation of Contaminant Removal Through Soil Aquifer Treatment by a Lab Scale Soil Column Experiment Including a Trace Contaminant Spike Test
… and the disinfection byproducts bromate and NDMA. During Phase 2 of testing, CECs, iron, arsenic, bromide, and sulfate were monitored in addition to those monitored during Phase 1. About 50% of the TOC was removed within 3 days of travel time, with no additional removal observed in 1 month. …
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Assessment and characterization of dissolved organic nitrogen removal in simulated soil aquifer treatment systems
… compounds. Since N-Nitroso-dimethylamine (NDMA), one of the nitrogenous disinfection by-products, concentrations were pretty low in our feed reclaimed water, and we did not reach conclusive results about the columns' capability of further removal of NDMA. However, our results showed that …
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Balancing Bromate Formation, Organics Oxidation, and Pathogen Inactivation: The Impact of Bromate Suppression Techniques on Ozonation System Performance in Reuse Waters
… 1,4-dioxane, and N-nitrosodimethylamine (NDMA) formation. Additionally, bromate suppression mechanisms of monochloramine were explored further through a variety of different water quality parameters, such as through hydroxyl radical exposure and ultraviolet absorption spectrum …
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Fundamental and Practical Aspects of Cometabolite Addition for 1,4-Dioxane Removal in Biofiltration
… or the removal of N-Nitrosodimethylamine (NDMA), a nitrogenous disinfection by product produced in upstream ozonation. BAC, with or without propane amendment, was found to be effective for the removal of low molecular weight organics produced in ozone, such as acetone, acetaldehyde, and …
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Navigating the Unregulated: A Multi-Tiered Public Health Risk Assessment of PFAS and N-DBPs Utilizing Unregulated Contaminant Monitoring Rule Data
… For carcinogenic risk, N-Nitrosodimethylamine (NDMA) and N-Nitrosodiethylamine (NDEA) were the primary drivers among N-DBPs. PFOA presented the highest risk among PFAS, despite sharing the same chain length with PFOS. This study yields three primary conclusions: (1) sulfonic functional groups …
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Functional characterisation of alkane-degrading monooxygenases in Rhodococcus jostii strain 8
… in the metabolism of gaseous alkanes are NDMA-dependent. The size of the genome sequence of R. jostii strain 8 is 8.5 Mbp with a G+C content of 67%. The closest relative of R. jostii strain 8, based on 16S rRNA sequence, is Rhodococcus jostii RHA1 with 99% identity. However, growth …