Cold on-column injection coupled with gas chromatography/mass spectrometry for determining halonitromethanes in drinking water

2016 ◽  
Vol 8 (2) ◽  
pp. 362-370 ◽  
Author(s):  
Haifeng Chen ◽  
Jinbao Yin ◽  
Mengjie Zhu ◽  
Cong Cao ◽  
Tingting Gong ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Drinking Water ◽  
Gas Chromatography Mass Spectrometry ◽  
Health Concerns ◽  
Chromatography Mass Spectrometry ◽  
By Products

Halonitromethanes (HNMs) are a class of halogenated nitrogenous disinfection by-products (N-DBPs) in drinking water which possess health concerns due to their potentially higher toxicity than regulated disinfection by-products (DBPs).

Method for Determination of Organohalogen Pesticide Residues in Vegetable Oil Refinery By-Products

1984 ◽  
Vol 67 (1) ◽  
pp. 95-106 ◽  
Author(s):  
Susan Young ◽  
Clower Marion ◽  
John A G Roach
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Detection System ◽  
Oil Refinery ◽  
Deodorizer Distillate ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Chromatographic Detection ◽  
By Products

Abstract A method using gel permeation and Florisil column chromatographic cleanup techniques is described for determination of residues of nonpolar organohalogen pesticides and pesticide alteration products in vegetable oils and their refinery by-products. Supplemental Florisil separation and alkali cleanup techniques are used to facilitate determinations. Residues are determined with a 63Ni electron capture gas chromatographic detection system used in conjunction with 3 different gas chromatographic columns. Residue identities are confirmed by gas chromatography-mass spectrometry. Recoveries of 7 organohalogen pesticides, ranging from 90 to 103%, were determined by the supplemental Florisil separation technique to augment previously reported recovery data determined for initial GPC and Florisil cleanup steps. Soybean, peanut, and cottonseed deodorizer distillates and crude and refined oil, as well as additional refinery by-products, were analyzed. Nine to 13 organohalogen residues ranging from 0.5 to 6.3 ppm were determined in the 2 soybean deodorizer distillate samples used to develop and test the method. Identities of residues present at ≥0.3 ppm were confirmed by gas chromatography-mass spectrometry. An intralaboratory trial of the method provided additional recovery and residue determination data as follows: Recoveries ranging from 102 to 116% were obtained for 4 pesticides added to peanut oil deodorizer distillate. Residues determined in 1 soybean deodorizer distillate sample supported previously obtained data for this sample.

Detection of Steroids in Tap and Drinking Water Using an Optimized Analytical Method by Gas Chromatography–Mass Spectrometry

2017 ◽  
Vol 10 (3) ◽  
pp. 189-199 ◽  
Author(s):  
Ramiro Vallejo-Rodríguez ◽  
Perla Berenice Sánchez-Torres ◽  
Alberto López-López ◽  
Elizabeth León-Becerril ◽  
Mario Murillo-Tovar
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Drinking Water ◽  
Analytical Method ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry

Comparison of two selective methods for determination of geosmin (1,2,7,7-tetramethyl-2-norborneol) and 2-MIB (2-methylisoborneol) in drinking and raw water samples by capillary gas chromatography - mass spectrometry

2010 ◽  
Vol 45 (4) ◽  
pp. 491-497 ◽  
Author(s):  
Linda Lunga Sibali ◽  
Carl Schoeman ◽  
Jabulile Selina Morobi ◽  
Barnard Saenet Molalatladi
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Drinking Water ◽  
Water Samples ◽  
Solid Phase ◽  
Gas Chromatography Mass Spectrometry ◽  
Raw Water ◽  
Preparation Methods ◽  
Chromatography Mass Spectrometry ◽  
Concentration Levels

Abstract Two sample preparation methods were introduced and compared in this study to establish a simple, rapid, sensitive and selective method of analysis for geosmin and 2-MIB in raw and drinking water samples. Geosmin and 2-MIB are major organic pollutants responsible for undesirable taste and odour in aqueous matrices. Thus, there is a need to continue monitoring these compounds since they occur at very low levels (ng/L) in our water systems. Purge and trap (P/T) and solid phase extraction(SPE) methods were evaluated and optimised for separation of these compounds. Mean percentage recoveries obtained in spiked distilled Milli-Q water (18.2 Ω) for 2-MIB and geosmin ranged from 90.1 ± 2.32 (geosmin) to 97.3 ± 3.34 (2-MIB) and from 78.5 ± 4.82 (geosmin) to 87.1 ± 1.02 (2-MIB) for SPE and P/T respectively. Concentration levels obtained in drinking water were between not detected (ND)-6.05 ng/L whereas in raw water samples concentration levels ranged from less than 1 to 371 ng/L. Gas chromatography-mass spectrometry (GC-MS) was used for identification and quantification of target compounds in this study.

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