Determination of Diazinon concentration by gas chromatography - Mass Spectrometry in underground drinking water resources located near the rice fields, before and after the pesticide spraying

2021 ◽  
pp. 106600
Author(s):  
Seyyedeh Faezeh Hosseini ◽  
Hamidreza Nassehinia ◽  
Hossein Nazari ◽  
Yusuf Dadban Shahamat ◽  
Zohre Banaee ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Drinking Water ◽  
Water Resources ◽  
Rice Fields ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Drinking Water Resources ◽  
Before And After

Determination of the Odorous Compounds in the Source of Drinking Water by Solid-Phase Microextraction and Gas Chromatography-Mass Spectrometry

2011 ◽  
Vol 356-360 ◽  
pp. 951-954
Author(s):  
Na Xu ◽  
Jing Liu ◽  
Jian Guang Liu ◽  
Nan Wang ◽  
Feng Lu
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Drinking Water ◽  
High Efficiency ◽  
Solid Phase ◽  
Practical Method ◽  
Gas Chromatography Mass Spectrometry ◽  
Chromatography Mass Spectrometry ◽  
Odorous Compounds

A simple, rapid, sensitive and high-efficiency method for determ-ination of odorous compounds such as 2-methylisobomeol (2-MIB) and trans-1,10-dimethyl-trans-9-decalol (Geosmin) in the source of drinking water was developed by solid-phase microe- xtraction(SPME) followed by gas chromatography-mass spectrometry(GC-MS). In this study, various of SPME conditions have been optimized in detail. The results show that DVB/CAR/ PDMS fiber was found to possess the best extraction efficiency for the odorous compounds in water. SPME was carried out by using 25mL samples, addition of 6 g NaCl, stirring at 1150 rpm and temperature at 80°C for 15 min to enrich the target analytes. After that, the fiber was desorbed at 250°C for 2min and determined by GC-MS. 2-MIB and GSM were separated within 15 min using a HP-5MS capillary column and detected in the selective ion monitoring mode. The optimized method has been proved with excellent linearity and precision. Using this method, the calibration curves of 2-MIB and GSM were linear in the range of 10-500 ng/L, and the correlation coefficients were both above 0.9984. The detection limits (S/N=3) of 2-MIB and GSM were 1.2 and 0.9 ng/L, respectively. The optimized SPME was proved to be a very practical method for determination of the trace odorous compounds in the source of drinking water and applied with satisfactory results.

Determination of trichloramine in drinking water using headspace gas chromatography/mass spectrometry

2010 ◽  
Vol 10 (1) ◽  
pp. 23-29 ◽  
Author(s):  
K. Kosaka ◽  
K. Seki ◽  
N. Kimura ◽  
Y. Kobayashi ◽  
M. Asami
Keyword(s):  
Mass Spectrometry ◽  
Gas Chromatography ◽  
Drinking Water ◽  
Tap Water ◽  
Gas Chromatography Mass Spectrometry ◽  
Ferrous Ammonium Sulfate ◽  
Headspace Gas Chromatography ◽  
Chromatography Mass Spectrometry ◽  
Headspace Gas

Trichloramine (NCl3) is one of the major causes of the chlorine odor in drinking water. In the present study, a method was developed for analysis of NCl3 concentration in water using headspace gas chromatography/mass spectrometry (HS–GC/MS). For quantification of NCl3, m/z of 51 was selected because other major m/z of NCl3 were also observed as fragments of trichloromethane (CHCl3) and the peaks of NCl3 and CHCl3 overlapped on the chromatogram. The limit of quantification for NCl3 was set to 15 μg-Cl2/L. The calibration curve of NCl3 was expressed as a quadratic curve because of the partial NCl3 decomposition. NCl3 concentrations in chlorinated ammonium solution were determined by HS–GC/MS and titration using N,N-diethyl-p-phenylenediamine and ferrous ammonium sulfate (DPD/FAS), and the results using the two methods were similar at pH 6 and 7. However, at pH 8, NCl3 was detected using HS–GC/MS, but not using DPD/FAS titration. NCl3 concentrations in nine tap water samples were determined using HS–GC/MS and ranged from < 15 to 46 μg-Cl2/L. The results of the present study indicated that HS–GC/MS is applicable to determination of NCl3 in drinking water.

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