DETERMINATION OF AROMATIC VOLATILE COMPOUNDS IN PETROCHEMICAL WASTEWATER

2011 ◽  
Vol 10 (8) ◽  
pp. 1081-1085 ◽  
Author(s):  
Elisabeta Chirila ◽  
Simona Dobrinas ◽  
Elena Paunescu ◽  
Gabriela Stanciu ◽  
Camelia Draghici
Keyword(s):  
Volatile Compounds ◽  
Petrochemical Wastewater

Bifunctional Metal Meshes Acting as a Semipermeable Membrane and Electrode for Sensitive Electrochemical Determination of Volatile Compounds

2021 ◽  
Author(s):  
Gabriela F. Giordano ◽  
Vitoria M. S. Freitas ◽  
Gabriel R. Schleder ◽  
Murilo Santhiago ◽  
Angelo L. Gobbi ◽  
...  
Keyword(s):  
Volatile Compounds ◽  
Electrochemical Determination ◽  
Semipermeable Membrane ◽  
Metal Meshes

scholarly journals Determination of the Chemical Composition of Tea by Chromatographic Methods: A Review

2015 ◽  
Vol 4 (3) ◽  
pp. 56 ◽  
Author(s):  
Alexandr Ya Yashin ◽  
Boris V. Nemzer ◽  
Emilie Combet ◽  
Yakov I. Yashin
Keyword(s):  
Chemical Composition ◽  
Volatile Compounds ◽  
Black Tea ◽  
Storage Conditions ◽  
Organoleptic Evaluation ◽  
Chromatographic Methods ◽  
Tea Quality ◽  
Processing And Storage ◽  
And Storage

<p>Despite the fact that mankind has been drinking tea for more than 5000 years, its chemical composition has been studied only in recent decades. These studies are primarily carried out using chromatographic methods. This review summarizes the latest information regarding the chemical composition of different tea grades by different chromatographic methods, which has not previously been reviewed in the same scope. Over the last 40 years, the qualitative and quantitative analyses of high volatile compounds were determined by GC and GC/MS. The main components responsible for aroma of green and black tea were revealed, and the low volatile compounds basically were determined by HPLC and LC/MS methods. Most studies focusing on the determination of catechins and caffeine in various teas (green, oolong, black and pu-erh) involved HPLC analysis.</p> <p>Knowledge of tea chemical composition helps in assessing its quality on the one hand, and helps to monitor and manage its growing, processing, and storage conditions on the other. In particular, this knowledge has enabled to establish the relationships between the chemical composition of tea and its properties by identifying the tea constituents which determine its aroma and taste. Therefore, assessment of tea quality does not only rely on subjective organoleptic evaluation, but also on objective physical and chemical methods, with extra determination of tea components most beneficial to human health. With this knowledge, the nutritional value of tea may be increased, and tea quality improved by providing via optimization of the growing, processing, and storage conditions.</p>

scholarly journals Gas Chromatographic Determination of some Volatile Compounds in Urine.

1962 ◽  
Vol 16 ◽  
pp. 1289-1290 ◽  
Author(s):  
Roger Bonnichsen ◽  
Maire Linturi ◽  
Anne-Marie Olson ◽  
T. Briggs ◽  
G. A. D. Haslewood ◽  
...  
Keyword(s):  
Volatile Compounds ◽  
Chromatographic Determination

scholarly journals Performance evaluation of an anaerobic hybrid reactor treating petrochemical effluent

2021 ◽  
Vol 14 ◽  
pp. 51-57
Author(s):  
M.T. Jafarzadeh ◽  
N. Jamshidi ◽  
L. Talebiazar ◽  
R. Aslaniavali
Keyword(s):  
Loading Rate ◽  
Biogas Production ◽  
Dairy Wastewater ◽  
Organic Loading Rate ◽  
Hybrid Reactor ◽  
Petrochemical Wastewater ◽  
Anaerobic Reactors ◽  
Anaerobic Hybrid Reactor ◽  
Study Performance

Organic loading rate (OLR), Hydraulic Retention Time (HRT) and up flow velocity are important parameters significantly affecting microbial ecology and characteristics of anaerobic reactors. In this study, Performance of an anaerobic hybrid reactor (UASB/Filter) at mesophilic condition was evaluated in a 15.4 L reactor receiving petrochemical wastewater. The temperature of influent was adjusted by an inline heat exchanger at around 35 ˚C. The reactor was seeded with flocculent sludge from a UASB plant treating dairy wastewater. The sludge was acclimatized to petrochemical wastewater in twostage operation. After 39 weeks, a COD reduction of 70.3% was obtained at OLR=2.0 kg m-3 d-1 and HRT=18 h. Under steady state conditions, experiments were conducted at OLRs of between 0.5 and 24 kg TCOD m-3 d-1 , hydraulic retention times (HRT) of 4-48 h and up flow velocities 0.021-0.25 m h-1. Removal efficiencies in the range of 42-86% were achieved at feed TCOD concentrations of 1000- 4000 mg L-1 . The biogas production data used for determination of biogas production kinetics. The values of Gmax and GB estimated as 11.173 LL-1d -1 and 85.83 g L-1d -1 , respectively.

scholarly journals Total Water Content of Mainstream Smoke and Sidestream Smoke / Über den Wassergehalt von Haupt- und Nebenstromrauch

1966 ◽  
Vol 3 (5) ◽  
Author(s):  
G. Neurath ◽  
H. Ehmke ◽  
H. Schneemann
Keyword(s):  
Volatile Compounds ◽  
Combustion Process ◽  
Vapour Phase ◽  
Total Water Content ◽  
Mainstream Smoke ◽  
Total Water ◽  
Sidestream Smoke ◽  
Large Water ◽  
Convection Stream

AbstractThe present paper gives a balance of total water (comprising moisture content of tobacco as well as water of combustion) in the smoking of a plain cigarette without filter under standard conditions. 62.8 % of the hydrogen originally present in the burnt portion of the cigarette are transformed into water. The sidestream smoke is enriched by the total water to a large extent, i.e., in proportion to the total water of a cigarette, 14.4 mg of water are calculated to be transferred to the mainstream smoke and 344.7 mg to the sidestream smoke and to the ashes. 14.6 % of the said hydrogen are found to be delivered into the condensates of main and sidestream smoke in the form of slightly volatile compounds containing hydrogen. The residual 22.6 % are transferred into the gas-vapour phase in the form of volatile compounds. The interpretation of temperature measurements made along the axis of and in the space above a freely smouldering cigarette (without drawing) as well as the determination of the velocity (33 cm/sec) of the escaping sidestream smoke indicate the presence of a rapid and steep convection stream over the glowing zone. This finding accounts for the large water enrichment of the sidestream smoke and for the fact that water formed by the combustion process does not contribute to the transfer of steam-volatile substances into the sidestream smoke.

scholarly journals Determination of volatile compounds in green tea and black tea from Turkey by using HS-SPME and GC-MS

2020 ◽  
Vol 50 (2) ◽  
Author(s):  
Aslı Can Ağca ◽  
Nilüfer Vural ◽  
Engin Şarer
Keyword(s):  
Volatile Compounds ◽  
Green Tea ◽  
Black Tea
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