Miniaturized and green method for determination of chemical oxygen demand using UV-induced oxidation with hydrogen peroxide and single drop microextraction

2013 ◽  
Vol 180 (11-12) ◽  
pp. 1029-1036 ◽  
Author(s):  
Jeyran Akhoundzadeh ◽  
Marta Costas ◽  
Isela Lavilla ◽  
Mahmoud Chamsaz ◽  
Carlos Bendicho
Keyword(s):  
Hydrogen Peroxide ◽  
Chemical Oxygen Demand ◽  
Oxygen Demand ◽  
Single Drop ◽  
Green Method ◽  
Single Drop Microextraction

Sensitive and Green Method for Determination of Chemical Oxygen Demand Using a Nano-copper Based Electrochemical Sensor

2017 ◽  
Vol 29 (10) ◽  
pp. 2401-2409 ◽  
Author(s):  
Ibrahim H. A. Badr ◽  
Hamdy H. Hassan ◽  
E. Hamed ◽  
Ali M. Abdel-Aziz
Keyword(s):  
Chemical Oxygen Demand ◽  
Electrochemical Sensor ◽  
Oxygen Demand ◽  
Green Method

Determination of Chlorobenzenes in Wastewater by Single-Drop Microextraction Coupled to Capillary Gas Chromatography

2013 ◽  
Vol 838-841 ◽  
pp. 2566-2569
Author(s):  
Jian Qi Sun ◽  
Bo Qiao ◽  
Jun Dai
Keyword(s):  
Gas Chromatography ◽  
Capillary Gas Chromatography ◽  
Preparation Technique ◽  
Single Drop ◽  
Flame Ionization ◽  
Single Drop Microextraction ◽  
Relative Standard ◽  
Efficient Recovery ◽  
Wastewater Samples

This study describes an analytical method employing capillary gas chromatography (GC) using flame ionization detection (FID) that has been developed for the simultaneous determination of chlorobenzenes (m-dichlorobenzene (m-DCB),p-dichlorobenzene (p-DCB),o-dichlorobenzene (o-DCB) and 1,2,4-trichlorobenzene (1,2,4-TCB)) in wastewater. For this purpose, single-drop microextraction (SDME) was applied as a sample preparation technique. The SDME parameters such as types of extractants, volume of the microdroplet size, extraction time, stir rate and immersion depth of needle point were studyed and optimized. The method was linear in the ranges from 4.0×10-3to 40.0 μg·mL-1form-DCB,p-DCB ando-DCB, and 4.0×10-3to 30.0 μg·mL-1for 1,2,4-TCB withR2≥0.9955. The SDME procedure allowed efficient recovery of the investigated chlorobenzenes ranging between 80 % and 105 % with a relative standard deviation (RSD) ≤6.5 for actual wastewater sampes spiked with 2, 5 and 10 μg·mL-1of chlorobenzes, respectively. These results showed the potential of this technique for chlorobenzenes monitoring in wastewater samples. Furthermore, the investigated methods are simple, reliable, reproducible, and not expensive.

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