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Sunday, April 26, 2020 | History

3 edition of Preservation of water samples containing nitroaromatics and nitramines found in the catalog.

Preservation of water samples containing nitroaromatics and nitramines

Preservation of water samples containing nitroaromatics and nitramines

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  • 17 Currently reading

Published by U.S. Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, Available from NTIS in [Hanover, N.H.], [Springfield, Va .
Written in English

    Subjects:
  • Nitroamines,
  • Nitroaromatic compounds,
  • Explosives, Military -- Environmental aspects,
  • Water -- Sampling

  • Edition Notes

    StatementThomas F. Jenkins ... [et al.].
    SeriesSpecial report -- 95-16., Special report (Cold Regions Research and Engineering Laboratory (U.S.)) -- 95-16.
    ContributionsJenkins, Thomas F., Cold Regions Research and Engineering Laboratory (U.S.), U.S. Army Environmental Center.
    Classifications
    LC ClassificationsGB2401 .U533 no. 95-16
    The Physical Object
    Paginationv, 31 p. :
    Number of Pages31
    ID Numbers
    Open LibraryOL17603979M
    OCLC/WorldCa32766038

    In the present study, physicochemical and microbiological characteristics of the drinking water were determined in November from different locations in Junagadh region, Gujarat, India. Total 22 water samples were collected from different locations in and around Junagadh city. E.C (Electrical conductivity), TDS (total dissolved solids), Salinity, pH and DO (Dissolve oxygen) . Typically aromatic compounds, such as bromobenzene or the para- and ortho-isomers of bromonitrobenzene, are susceptible to electrophilic attacks. There are cases, however, when the aromatic compound has been adequately substituted with electron-withdrawing groups such that it becomes susceptible to nucleophilic attacks. One case would be 2,4-dinitrochlorobenzene, .


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Preservation of water samples containing nitroaromatics and nitramines Download PDF EPUB FB2

Get this from a library. Preservation of water samples containing nitroaromatics and nitramines. [Thomas F Jenkins; Cold Regions Research and Engineering Laboratory (U.S.); U.S. Army Environmental Center.;]. Soil samples containing as much as 2% of 2,4,6-TNT have been safely ground.

Samples containing higher concentrations should not be ground in a mortar and pestle or a mechanical grinder. Method is for 2,4,6-TNT, but the other nitroaromatics will also cause a color to be developed and provide a rough estimation of their concentrations.

SAMPLE PRESERVATIVES AND HOLD TIMES DRINKING WATER Method Parameter Amount Container Preservative Hold Time, SM Alkalinity, Acidity ml ml P -6 C 14 days TEM Asbestos ml L P C 48 hours, Chloride, Sulfate, Bromide ml 1 ml P 2 6 C 28 days, SMFile Size: KB.

United States. Table Mountain Parkway Golden, Colorado The following document discusses the method for the trace analysis of explosives and propellant residues by high performance liquid chromatography (HPLC) using a dual wavelength ultraviolet (UV) detector. You may need a PDF reader to view some of the files on this page.

See EPA’s About PDF page to learn more. Validated Test Method B: Nitroaromatics, Nitramines. Contamination of water by pesticides is an important issue in many regions, posing problems in the environmental, water management and health sectors. To assess the extent of contamination of water, effective and properly designed analytical methods having sufficient sensitivity and accuracy are needed.

THE DRINKING WATER INSPECTORATE SAMPLE PRESERVATION AND PREPARATION FOR METALS Best practice for sample preservation is documented in ISO Part Real samples and, if necessary, spiked real samples containing concentrations of each metal of interest at concentrations close to the PCV including natural particulate materialFile Size: KB.

A review article with 35 references on the stability and preservation of samples of trace pesticides in water is presented. Stabilization and storage of samples are discussed together with methods of extraction and by: Abstract: An analytical method for the determination of nitroaromatic, nitramine, and nitrate ester explosives and co-contaminants in water was developed based on SPE (solid-phase extraction) and GC-ECD (gas chromato-graph-electron capture detector).

Water samples are pre-concentrated using either cartridge or disk SPE followedCited by: SAMPLE PREPARATION OF NITROAMINES AND NITROAROMATICS IN SEDIMENT Log-In ‹ Match the sample(s) to its Analytical Services Request form(s) and fill out a data sheet.

‹ Decant the excess water from each sample and dispose of it in the non-chlorinated waste stream. ‹ Place the samples in the sample storage refrigerator (4ºC ± 2º). HNO3 is added to samples for two purposes. One, at the time of sample collection-to reduce pH.

In the view of accepted ideas about the preservation of nitrite in freshwater, this short note presents experiments questioning standard laboratories procedures and tries to be a caveat to experimenters looking for sole total nitrite values more than for total nitrate plus nitrite concentrations.

To validate an adequate preservation technique for nitrite, we realized a series Cited by: 3. As PETN had a very low solubility in Preservation of water samples containing nitroaromatics and nitramines book, common soil ions could be eliminated by prewashing the sample with water, or in acetone-water mixtures, Ca²⁺, K⁺, Cl⁻, SO4²⁻, and NO3⁻ could.

The results are shown in FIG. Over a period of hours, KMR-1 was observed to grow to a high OD in non-reduced medium containing no nitroaromatics or nitramines (i.e., "no explosives"); this OD was higher than that attained by KMR-1 on medium containing explosives and either a reductant or no reductant.

Highlights It is necessary to improve existing and develop new sludge management techniques. One method is dewatering and biodegradation of compounds in constructed wetlands. The result showed high reduction of all tested parameters after treatment. Plants improve degradation and Phragmites australis is tolerant to xenobiotics.

The amount of sludge could be reduced by Cited by: An aliquot of nitrate solution (containing μg L-1) was placed in a conical flask fitted with a ground glass stopper.

The pH was adjusted to ca. with mL of the buffer solution. The solution was diluted to mL with water, and mL of x M PPP was added.

The solution was mixed well and was allowed to rest for 5 min. The presence of a nitro group in a compound can result in several toxicity issues including carcinogenicity, hepatotoxicity, mutagenicity, and bone-marrow uently, some nitro drugs are avoided where there are suitable alternatives; for example, other antibiotics are preferred to addition, the risk of nitro drug toxicity can be reduced by Cited by: b.

Reduce the flow of the water and fill the sample container to the shoulder of the bottle. Replace and tighten the cap and make sure it is not leaking.

Please complete the Inorganic Chemical Examination of Water for Nitrate* request form. *Only original bar-coded forms will be accepted.

NO COPIES. The PT sample is a soil containing trace levels of explosives and explosive residues. The PT sample size provided is 30 g of soil. The soil has been chemically stabilized to minimize degradation of the sample.

TECHNIQUES OF WATER-RESOURCES INVESTIGATIONS Part I. Sampling Refer to Part I, Chapter Al of Book 5, for information on site selection, frequency, field safety, and first aid.

Before a proper sampling program can be initiated, the nature of Cited by: 5. Nitro compounds are organic compounds that contain one or more nitro functional groups (−N O 2).The nitro group is one of the most common explosophores (functional group that makes a compound explosive) used globally.

The nitro group is also strongly e of this property, C−H bonds alpha (adjacent) to the nitro group can be acidic. It is therefore clear that the presence of RDX or NG in samples for NO 2 − /NO 3 − analysis may cause an important overestimation of the NO 2 − /NO 3 − concentrations, possibly leading to misinterpretation of the results.

An example of this is provided in Fig. results represent the NG and N-(NO 2 − + NO 3 −) concentrations measured over time in the effluent water Cited by: 6. This technology is a chemical cocktail intended for preservation of biological samples like blood and saliva.

The present invention includes combining the liquid biological sample with the preservative comprising of sodium benzoate in an amount of at least % of the sample (weight/volume); and citric acid in an amount of at least %.

EPA//R/ Novem Standardized Analytical Methods for Environmental Restoration following Homeland Security Events Revision Novem Prepared by Computer Sciences Corporation Alexandria, VA Prepared under EPA Contract No. EP-W Prepared for National Homeland Security Research Center United States.

water samples and handling of sample preservatives. Follow the procedures described below to assist in the collection of an acceptable sample and to maintain the integrity of the sample after collection. Prepare a Sampling and Analysis Plan (SAP) which describes the sampling locations, numbers and types ofFile Size: KB.

water. The photolytic half-life of 1,3-DNB in pure water was calculated to be 23 days (Simmons and Zepp ). A three- to four-fold increase in the rate of photoreaction of 1,3-DNB was observed in ambient waters containing natural humic substances or in distilled water containing dissolved humic.

SYNTHETIC NITROAROMATIC COMPOUNDS. Nitration is the main reaction used to synthesize nitroaromatic compounds. Nitronium ions (NO 2 +) are generated in a mixed-acid reaction of sulfuric and nitric acids and then added onto aromatic substrates via electrophilic substitution ().In this fashion, benzene, toluene, and phenol are converted into nitrobenzene, nitrotoluenes, and Cited by: Wang W, Yu J, An W, Yang M.

Occurrence and profiling of multiple nitrosamines in source water and drinking water of China. The Science of the Total Environment. Feb 17; doi: /env The occurrence of multiple nitrosamines was investigated in 54 drinking water treatment plants (DWTPs) from 30 cities across major.

Nitroglycerin ALS Environmental may or may not test for Nitroglycerin (CAS # ). Information is subject to change; please contact us for the latest available analytes for which we test. ALS Environmental does not sell chemicals, but offers analytical lab testing to determine the presence of various elements and chemical compounds.

Water and ocean structures and seawater chemistry Learn with flashcards, games, and more — for free. Water that has been generated by any method which would achieve the performance specifications for ASTM Type II water. For organic analyses, see the definition of organic-free reagent water.

A material containing known quantities of target analytes in solution or in a homogeneous matrix. The limits of detection (LODs) were ~ ng/L. This method has been successfully applied to the determination of nitroaromatics and cyclic ketones in the sea water samples obtained from East China Sea.

The concentrations of nitrobenzene, 1,3-dinitrobenzene and 2,6-dinitrotoluene in the sea water sample were, μg/L. Sample preparation Fill a mL Class A Volumetric Flask with mL of organic free reagent water.

Allow the ampule concentrate to equilibrate to room temperature. Open the ampule and pipet exactly mL of the concentrate into the flask. Buy high purity EPA Method Nitroaromatics & Isophorone Mixture analytical standards from Chem Service Inc.

at $ (M-CSBML). ation, and sterile water for irrigation. These changes became effec-tive December 1, Finally, the most sig-nificant change in water testing across the pharmacopoeia is the endorsements of online, real-time testing. Whether you produce water that is µS/cm or µS/cm (14x greater), the resulting water will be ~1 µS/cm when File Size: 58KB.

Passive sampling methodologies were used to conduct a chemical and toxicologic assessment of organic contaminants in the surface waters of three geographically distinct agricultural watersheds.

A selection of current-use agrochemicals and persistent organic pollutants, including polycyclic aromatic hydrocarbons, polychlorinated biphenyls, and organochlorine pesticides. Exploration of the low-lying structures of atomic or molecular clusters remains a fundamental problem in nanocluster science.

Basin hopping is typically employed in conjunction with random motion, which is a perturbation of a local minimum structure. We have combined two different sampling technologies, “random sampling” and “compressed sampling”, to explore the Cited by: We demonstrate the use of polyethylene devices (PEDs) for assessing hydrophobic organic compounds (HOCs) in aquatic environments.

Like semipermeable membrane devices (SPMDs) and solid-phase microextraction (SPME), PEDs passively accumulate HOCs in proportion to their freely dissolved concentrations.

Polyethylene-water partition constants (KPEWs) were. columns containing granular iron were followed by either an anaerobic or aerobic soil column. Both 2,4- and 2,6-DNT were used to determine if competitive effects exist between the two. The ISM isolates a volume of the aquifer material and allows for in situ solute loading and sampling in order to characterize chemical or biological reactions.

The results indicated transformation of nitroaromatics via nitro-reduction to their intermediate products, mainly as 2,4-DAT, 2,6-DAT, and aniline. Within 20 days, a loss of up to 92% of 2,4-DNT was observed with the formation of 2,4-DAT. generated by reacting a mixture of 20% nitric acid, 60% sulfuric acid, and 20% water.

Generally, the nitration reaction is performed under mild reaction conditions at K temperature to give the product p-nitrophenol along with formation of o-nitrophenol and 2,4-dinitrophenol [9].File Size: 4MB.The physiochemical analysis of the water samples (Akin-Olugbade and Lafenwa) showed that Ogun river in which all rivers and streams in the city flow into, and which serves as source of water supply, and fishing zone for Abeokuta populace has its results as shown in the tables 1 to 3.

Table 1 presents the physical parameters of the water samples.Krasner, SW, Westerhoff, P, Mitch, W, Skadsen, J & Von Gunten, UControlling the formation of nitrosamines during water treatment. in Water Quality Technology Conference and Exposition, WQTC Water Quality Technology Conference and Exposition, WQTCLong Beach, CA, United States, 11/3/Cited by: 8.