Determination of chlorinated benzenes in bottom sediment samples by WCOT column gas chromatography

1985 ◽  
Vol 57 (4) ◽  
pp. 801-805 ◽  
Author(s):  
F. I. Onuska ◽  
K. A. Terry
Keyword(s):  
Gas Chromatography ◽  
Bottom Sediment ◽  
Chlorinated Benzenes ◽  
Sediment Samples

scholarly journals Methods development for the determination of methyl mercury in sediment samples using gas chromatography with atomic fluorescence detection

2013 ◽  
Vol 16 (2) ◽  
pp. 53-60
Author(s):  
An Quoc Trieu ◽  
Huy Phuong Tran ◽  
Dong Van Nguyen
Keyword(s):  
Gas Chromatography ◽  
Detection Limit ◽  
Fluorescence Detection ◽  
Potassium Oxalate ◽  
Fluorescence Detector ◽  
Atomic Fluorescence ◽  
Sediment Samples ◽  
Methods Development ◽  
Instrumental System

An analytical method for methylmercury (MeHg) using gas chromatography with atomic fluorescence detection is studied. The instrumental system is made based on a old gas chromatograph interfaced with an atomic fluorescence detector which is specific to Hg, currently available in our lab. Operating parameters for the GC-AFS system are optimised and analytical performances of the system are verified by quality control chart for stability. MeHg in sediment is leached and extracted to dichloromethane (DCM) in the presence of nitric acid, potassium chloride and copper sulfate. DCM in the extract is purged and MeHg is back extracted to aqueous phase followed by ethylation with sodium tetraethylborate in acetate buffer pH 5.3 containing potassium oxalate. The ethylated MeHg is then extracted to hexane and injected to GC-AFS for quantitation. The instrumental detection limit and method detection limit are 0.5 pg MeHg and 0.029 ppb MeHg (as Hg), respectively. The method can be applied for the determination of MeHg in soil, sludge and sediment samples.

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