scholarly journals Possibilities for decreasing detection limits of analytical methods for determination of transformation products of unsymmetrical dimethylhydrazine in environmental samples

2015 ◽  
pp. 50-58 ◽  
Author(s):  
Bulat Kenessov ◽  
Nadezhda Bakaikina ◽  
Alma Ormanbekovna Bimaganbetova
Keyword(s):  
Analytical Methods ◽  
Environmental Samples ◽  
Detection Limits ◽  
Transformation Products ◽  
Unsymmetrical Dimethylhydrazine

scholarly journals Multi-residue analytical methods for the determination of pesticides and PPCPs in water by LC-MS/MS: a review

2012 ◽  
Vol 10 (3) ◽  
pp. 876-899 ◽  
Author(s):  
Ednei Primel ◽  
Sergiane Caldas ◽  
Ana Escarrone
Keyword(s):  
Mass Spectrometry ◽  
Analytical Methods ◽  
Environmental Samples ◽  
World Wide ◽  
Matrix Effects ◽  
Tandem Mass ◽  
Selective Determination ◽  
Chromatography Tandem Mass Spectrometry ◽  
Liquid Chromatography Tandem Mass

AbstractResidues of pesticides, pharmaceutical and personal care products (PPCPs) are contaminants of world-wide concern. Consequently, there is a growing need to develop reliable analytical methods, which enable rapid, sensitive and selective determination of these pollutants in environmental samples, at trace levels. In this paper, a review of the liquid chromatography-tandem mass spectrometry (LC-MS/MS) based methods for the determination of pesticides and PPCPs in the environment is presented. Advanced aspects of current LC-MS/MS methodology, including sample preparation and matrix effects, are discussed.

Determination of strontium 90 in environmental samples by triple quadrupole ICP-MS and its application to Fukushima soil samples

2018 ◽  
Vol 33 (6) ◽  
pp. 1081-1085 ◽  
Author(s):  
Takeshi Ohno ◽  
Mutsumi Hirono ◽  
Shinichiro Kakuta ◽  
Shuhei Sakata
Keyword(s):  
Analytical Methods ◽  
Environmental Samples ◽  
Soil Samples ◽  
Triple Quadrupole ◽  
Sample Throughput ◽  
Icp Ms ◽  
Strontium 90

The determination of 90Sr by triple quadrupole ICP-MS is capable of providing a high sample throughput compared with radiometric analytical methods.

Determination of Tetracycline Using Ultrasound–Assisted Dispersive Liquid–Liquid Microextraction Based on Solidification of Floating Organic Droplet Followed by HPLC-UV System

2021 ◽  
Author(s):  
Mojtaba Rahimi Moghadam ◽  
Behrooz Zargar ◽  
Saadat Rastegarzadeh
Keyword(s):  
Analytical Methods ◽  
Environmental Samples ◽  
Feed Additives ◽  
Farm Animals ◽  
Tetracycline Hydrochloride ◽  
Serum Samples ◽  
Ultrasound Assisted ◽  
Dispersive Liquid Liquid Microextraction ◽  
Liquid Microextraction

Abstract Background Tetracyclines are a group of broad-spectrum antibiotics that used to controls bacterial diseases in humans or are applied as feed additives to enhance growth in farm animals. Tetracyclines are released into the aquatic environment in different pathways. Many analytical methods combined with a preconcentration step have been introduced for the determination of tetracycline in various environmental samples. Objective The objective this paper is developing reliable analytical methods for determination of tetracycline trace in various environmental samples. Method In present work, combine ultrasound-assisted and dispersive liquid–liquid microextraction according to the solidification of floating organic drop as a sample preconcentration procedure for determining tetracycline hydrochloride HPLC in water and serum samples was used. Results A series of parameters, including the type and volume of disperser and extraction solvents, salt effect, extraction time, and pH of solution influencing the extraction efficiency of UA-DLLME-SFO, was examined. Enrichment factors (EFs) were in the range of 125–137 for tetracycline hydrochloride under optimum conditions. The linear range was calculated from 0.005–3 mg/L and LOD 0.002 mg/L. Relative standard deviations (RSD) were in the range of 2.7 to 3.2 (n = 5). The UA-DLLME-SFO method used in water and serum samples revealed good extraction recoveries with RSD of 2.7–4.3%. Conclusion This method significantly decreased the organic solvent volume from 3 mL to 90 µL, also LOD and linear ranges were lower than or almost close to levels obtained in other research studies. In this procedure, ultrasound bath enhanced the mixing and contact between the sample solution and the extraction solvent.

scholarly journals A Review of Analytical Methods for the Determination of Sulfolane and Alkanolamines in Environmental Studies

2002 ◽  
Vol 85 (1) ◽  
pp. 154-162 ◽  
Author(s):  
John V Headley ◽  
Phillip M Fedorak ◽  
Leslie C Dickson
Keyword(s):  
Analytical Methods ◽  
Transformation Products ◽  
Water Soluble ◽  
Aquatic Environments ◽  
Ionization Mass ◽  
Chromatographic Separations ◽  
Gas Processing ◽  
Preparation Techniques ◽  
Positive Ion

Abstract Sulfolane and alkanolamines are used extensively in the processing of sour natural gases. Over many years of operation, there have been inadvertent leaks of these chemicals to groundwater and wetlands surrounding gas processing facilities, leading to uptake by vegetation. Because sulfolane and alkanolamines are extremely water-soluble, their analysis has presented challenges, particularly requirements for suitable extraction from biological matrixes and soil, along with sensitive detection using commonly available instrumentation. Analytical methods usually use gas chromatography or liquid chromatography with a variety of detector systems. Sample preparation techniques may include extraction with organic solvents, water, or a combination of these. In some cases, direct aqueous injections have been used. Derivatization of alkanolamines has been used to improve the chromatographic separations and detection. More recent procedures, using positive-ion electrospray ionization mass spectrometry (MS), have been useful for the confirmation of uptake of the alkanolamines and transformation products by wetland vegetation. Future developments will likely center on further MS analyses for identification of metabolites and transformation products in aquatic environments.

scholarly journals Pharmaceuticals and related compounds as emerging pollutants in water: analytical aspects

2013 ◽  
Vol 15 (1) ◽  
pp. 1-12 ◽  
Keyword(s):  
Analytical Methods ◽  
Environmental Samples ◽  
Degradation Products ◽  
Transformation Products ◽  
Emerging Pollutants ◽  
Highly Sensitive ◽  
Significant Research ◽  
Tandem Mass Spectrometric ◽  
Diverse Groups ◽  
Related Compounds

Emerging pollutants are increasingly detected in aqueous environmental samples, with pharmaceuticals and related compounds consisting a large category with many diverse groups, including parent compounds and their metabolites/transformation products. Significant research is performed on this subject worldwide, in order to obtain information regarding their occurrence, fate and health effects. In this effort, development and optimization of highly sensitive and accurate analytical methods for their determination in environmental samples is a necessity, but also a challenge. Advanced analytical methods for emerging pollutants include liquid chromatography (LC) or gas chromatography (GC) followed by tandem mass spectrometric (MS/MS) detection. These methods, combined with a variety of sample preparation procedures, provide the ability to analyze emerging pollutants in the environment in trace levels, and to identify and quantify their oxidation/degradation products. However, there are still many analytical aspects that need improvement and optimization for increasing the accuracy and sensitivity of the methods, in order to be able to fill the gaps of knowledge on the studied compounds.

Evaluation of EPA Method 8120 for Determination of Chlorinated Hydrocarbons in Environmental Samples

1989 ◽  
Vol 72 (4) ◽  
pp. 593-602
Author(s):  
Viorica Lopez Avila, ◽  
S N Dodhiwala ◽  
June Milanes ◽  
Werner F Beckert
Keyword(s):  
Environmental Samples ◽  
Chlorinated Hydrocarbons ◽  
Detection Limits ◽  
Current Method ◽  
Fused Silica ◽  
Tubular Columns ◽  
Cleanup Procedure ◽  
Case Basis ◽  
Quantitative Recovery

Abstract Method 8120 of EPA Manual SW-846 has been evaluated in a singlelaboratory study. Several modifications made to the current method were implemented to allow determination of selected chlorinated hydrocarbons in complex environmental samples. The 2 packed gas chromatographic columns specified in Method 8120 were replaced with 2 megabore fused-silica open tubular columns chemically bonded with trifluoropropylmethyl siloxane and polyethylene glycol, respectively. The list of target compounds was expanded from 15 to 22 to include all possible trichlorobenzenes, tetrachlorobenzenes, and hexachlorocyclohexane (BHC) isomers. The Florisil cleanup procedure was modified to allow quantitative recovery of 20 of the 22 target compounds. A procedure that uses 1 g Florisil disposable cartridges and hexane-acetone (9:1) eluant was developed. This latter procedure gives quantitative recovery of all 22 target compounds from all matrixes tested. The revised method was tested with a variety of sample matrixes. Detection limits for water samples ranged from 1.4 ng/L for hexachlorobutadiene to 1300 ng/L for 2-chloronaphthalene; detection limits for 15 compounds were below 40 ng/L. Because of background contamination, detection limits for soil and sediment samples need to be determined on a case-by-case basis.

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