scholarly journals Thermometric Titration for Rapid Determination of Trace Water in Jet Fuel

2017 ◽  
Vol 2017 ◽  
pp. 1-5 ◽  
Author(s):  
Jian-Qiang Hu ◽  
Jian-Jian Zhang ◽  
Shi-Zhao Yang ◽  
Yong-Liang Xin ◽  
Li Guo ◽  
...  
Keyword(s):  
Rapid Determination ◽  
Accurate Determination ◽  
Methanesulfonic Acid ◽  
Jet Fuel ◽  
Jet Fuels ◽  
Validity And Reliability ◽  
Whole Process ◽  
Thermometric Titration ◽  
Trace Water

Water content in jet fuels is detected by thermometric titration (TMT), and the optimal detected system is 2,2-dimethoxypropane as titrant, cyclohexane and isopropanol as titration solvents, and methanesulfonic acid as catalyst in this method. The amounts of oil, concentration and delivery rate of titrant, volumes, and the reliability and accuracy of thermometric titration were emphasized. The results show that the accuracy, validity, and reliability of TMT are excellent by different indicated spiked water contents. The obtained results between TMT and Karl Fischer titration have been proven to be in accord. But, the duration of titration merely spends 3–5 min in the whole process, greatly shortening the detected time. Therefore, rapid and accurate determination of trace water in a jet fuel can be realized by TMT.

Use Differential Pulse Voltammetry for Determining the 2,6-Ditertbutyl-4-Methylphenol in Jet Fuels

2012 ◽  
Vol 455-456 ◽  
pp. 716-720 ◽  
Author(s):  
Yong Gang Shi ◽  
Bin Su ◽  
Hai Feng Gong ◽  
Yan Xue
Keyword(s):  
Differential Pulse Voltammetry ◽  
Standard Addition ◽  
Differential Pulse ◽  
Jet Fuel ◽  
Jet Fuels ◽  
Addition Method ◽  
Electrolytic Solution ◽  
Voltammetric Characteristics ◽  
Pulse Voltammetry

A new method for determination of antioxidants in jet fuels, which is based on the differential pulse voltammetric characteristics of the antioxidant 2,6-ditertbutyl-4-methylphenol in the solution of saturated KOH anhydrous ethyl alcohols, is established. The experimental results have shown that there is a linear relationship between the content of 2,6-ditertbutyl-4-Methyl-phenol in the jet fuel and the differential pulse voltammetry response in the electrolytic solution. It has also been shown that the antioxidant contents can be reliably and simply determined with the help of the standard addition method. The largest relative error of the determination is 6.70 %, the biggest confidence for 5 samples is 1.95 mg/L (n=5, 95% confidence level).

Rapid determination of whole-body bicarbonate kinetics by use of a digital infusion

1984 ◽  
Vol 247 (4) ◽  
pp. R709-R716 ◽  
Author(s):  
C. S. Irving ◽  
W. W. Wong ◽  
W. M. Wong ◽  
T. W. Boutton ◽  
R. J. Shulman ◽  
...  
Keyword(s):  
Kinetic Parameters ◽  
Rapid Determination ◽  
Accurate Determination ◽  
Substrate Oxidation ◽  
Whole Body ◽  
Constant Infusion ◽  
External Control ◽  
Base Line ◽  
Oxidation Rates

Accurate determination of substrate oxidation rates from breath 13CO2 levels often requires information on the bicarbonate status of the subject. We have developed a rapid method to obtain a complete set of bicarbonate kinetic parameters, prime bicarbonate pools with 13C, clamp breath 13CO2 levels rapidly and accurately with predetermined ranges, and provide a steady base-line enrichment of 13C for a subsequent substrate oxidation measurement. The method consists of administering NaH13CO3 intravenously as a combination of a bolus dose, an exponentially decreasing infusion, and a constant infusion. A Harvard model 2729 microprocessor-controlled syringe pump was modified for external control and coupled to a Hewlett-Packard HP-85 desk-top computer to deliver the complex infusion. An infusion algorithm that would rapidly attain and maintain an increase of 50% 13C enrichment of breath CO2 was derived by using the SAAM-27 program to interrogate a three-compartmental model of bicarbonate kinetics in normal, fasted, resting adult subjects. When the method was tested on five adult fasted subjects who had rested for 1.5 h, plateau enrichments were achieved within 10–20 min. The bicarbonate pool sizes and kinetic parameters obtained by compartmental analysis of their 13CO2 data were used to obtain a refined infusion protocol, which resulted in more rapid attainment of plateau enrichments. If carried out immediately before a substrate oxidation test, the method can provide a complete description of bicarbonate kinetics for use in the compartmental and noncompartmental analysis of substrate catabolism.(ABSTRACT TRUNCATED AT 250 WORDS)

Rapid Determination of Dissolved Copper in Jet Fuels Using Bathocuproine

2003 ◽  
Vol 17 (3) ◽  
pp. 699-704 ◽  
Author(s):  
Qin Lu ◽  
Jing-Fong Wei ◽  
Greg E. Collins ◽  
Robert E. Morris ◽  
Pamela M. Serino ◽  
...  
Keyword(s):  
Rapid Determination ◽  
Jet Fuels

Rapid Determination of Ammonia in a Perchloric Acid Supernate from Blood, by Use of an Ammonia-Specific Electrode

1973 ◽  
Vol 19 (10) ◽  
pp. 1162-1169 ◽  
Author(s):  
Henning F Proelss ◽  
Billy W Wright
Keyword(s):  
Perchloric Acid ◽  
Rapid Determination ◽  
Clinical Status ◽  
Accurate Determination ◽  
Ammonia Nitrogen ◽  
Blood Proteins ◽  
Exchange Method ◽  
Time Required ◽  
Sensitivity Specificity

Abstract A simple, rapid method was developed for accurate determination of ammonia in whole blood. Blood proteins were precipitated with perchloric acid (8 g/dl) and the free ammonia liberated in the supernate on alkalinization was measured directly with an ammonia-specific electrode after adjusting the sample temperature to 25 °C. Some variables affecting precision, accuracy, and electrode performance were studied. Sensitivity, specificity, and interferences are discussed. The tentative normal range is 28 ± 14 µg of ammonia nitrogen per deciliter. The coefficient of variation was 4.8% in the "normal," 3.6% in the "abnormal" range. Abnormal values were correlated with clinical status. Recoveries averaged 99.3%. Correlation with an established ion-exchange method for plasma ammonia was 0.994. Total time required for a complete assay is 15 min.

scholarly journals Rapid determination of 26 elements in iron meteorites using matrix removal and membrane desolvating quadrupole ICP-MS

2014 ◽  
Vol 29 (12) ◽  
pp. 2379-2387 ◽  
Author(s):  
Xiaoxia Duan ◽  
Marcel Regelous
Keyword(s):  
Rapid Determination ◽  
Accurate Determination ◽  
Iron Meteorites ◽  
Icp Ms ◽  
Matrix Removal

Rapid and accurate determination of 26 elements in iron meteorites by Q-ICPMS.

Development of a mobile, open-circuit indirect calorimetry system

1994 ◽  
Vol 74 (1) ◽  
pp. 65-71 ◽  
Author(s):  
J. M. Kelly ◽  
B. Kerrigan ◽  
L. P. Milligan ◽  
B. W. McBride
Keyword(s):  
Oxygen Consumption ◽  
Energy Metabolism ◽  
Indirect Calorimetry ◽  
Rapid Determination ◽  
Accurate Determination ◽  
Standard Test ◽  
Open Circuit ◽  
Absolute Pressure ◽  
Gas Temperature

A system for the rapid determination of O2 consumption, CO2 production and subsequent indirect estimation of energy metabolism of ruminants has been updated and validated. The accurate determination of gas temperature, relative humidity, absolute pressure and flow is important to the overall use of the system. Analogue outputs from the specific analyzers were multiplexed and then routed to a data acquisition system with appropriate software control. Subsequent data processing included modification to fit LOTUS 1-2-3 files. The analyzers were calibrated with standard test gases for the gas meters. In an experimental confirmation trial, eight sheep were fed at maintenance (M) or 2× maintenance (2M) or fasted 48 h after each level of intake (MF and 2MF, respectively) and subsequent energy metabolism was determined. Oxygen consumption (mL min−1), metabolic rate (W) and CO2 production (mL min−1) were greater (P < 0.05) for animals fed 2M (111.2, 379.5 and 101.9, respectively) than for those fed M (85.4, 291.2 and 86.1, respectively). Maintenance values were, in turn, also higher (P < 0.05) than those for either MF (56.7, 193.4 and 48.0, respectively) or 2MF (54.6, 186.4 and 46.3, respectively). M sheep had a higher respiratory quotient (1.03) (P < 0.05) than either MF sheep (0.86) or 2MF sheep (0.89), with 2M sheep being intermediate (0.95). There were no differences (P > 0.05) between the two fasted states for all parameters. Results from the confirmation experiment agree with previously published work and were consistent with those from similar systems. Key words: Indirect calorimetry, oxygen consumption, sheep

Rapid determination of sulfide sulfur in anaerobic system by gas-phase molecular absorption spectrometry

2014 ◽  
Vol 6 (22) ◽  
pp. 9085-9092 ◽  
Author(s):  
Dong Chen ◽  
Shilei Li ◽  
Haibo Liu ◽  
Tianhu Chen ◽  
Chen Chen ◽  
...  
Keyword(s):  
Gas Phase ◽  
Rapid Determination ◽  
Detection System ◽  
Accurate Determination ◽  
Absorption Spectrometry ◽  
Sulfide Sulfur ◽  
Molecular Absorption ◽  
Molecular Absorption Spectrometry ◽  
Anaerobic System

A detection system was designed for rapid and accurate determination of sulfide sulfur in an anaerobic system by gas-phase molecular absorption spectrometry (GPMAS).

scholarly journals Hydroperoxides Formation in Jet Fuels Coming from Different Production Processes in Simulated Fuel System of Modern Aircraft

2017 ◽  
Vol 43 (1) ◽  
pp. 277-299 ◽  
Author(s):  
Jarosław Sarnecki ◽  
Bartosz Gawron ◽  
Jadwiga Głąb
Keyword(s):  
Thermal Action ◽  
Degradation Process ◽  
Jet Fuel ◽  
Jet Fuels ◽  
Test Rig ◽  
Production Processes ◽  
Simulated Fuel ◽  
Science Centre ◽  
National Science

Abstract The paper presents issues related to the process of thermal degradation of jet fuel. This process is of a different nature depending on temperature and time, in which the fuel is subjected to thermal action. The standard method for testing the jet fuel thermal stability seems to be insufficient, therefore, the conduct of the research on a dedicated test rig was taken in this paper. The assessment of the fuel degradation process was carried out on the basis of determination of hydroperoxide and acid numbers as signs of the occurred process. The article has been prepared within the research project No. 2011/01/D/ST8/06567 funded by the National Science Centre in Poland.

scholarly journals Determination of the Total Phenolic Content in Wine Samples Using Potentiometric Method Based on Permanganate Ion as an Indicator

Molecules ◽  
2019 ◽  
Vol 24 (18) ◽  
pp. 3279
Author(s):  
Ziqi Sun ◽  
Yufeng Zhang ◽  
Xinyue Xu ◽  
Minglin Wang ◽  
Lijuan Kou
Keyword(s):  
Gallic Acid ◽  
Total Phenolic Content ◽  
Phenolic Content ◽  
Rapid Determination ◽  
Accurate Determination ◽  
Potentiometric Sensor ◽  
Total Phenolic ◽  
Linear Potential ◽  
Permanganate Ion

A rapid and accurate determination method for total phenolic content is of great importance for controlling the quality of wine samples. A promising potentiometric detection approach, based on permanganate ion fluxes across ion-selective electrode membranes, is fabricated for measuring the total phenolic content of wine. The results show that the presence of phenols, such as gallic acid, leads to a potential increase for the potentiometric sensor. Additionally, the present sensor exhibits a linear potential response with the concentration range from 0.05 to 3.0 g/L with a detection limit of 6.6 mg/L calculated using gallic acid. These sensors also exhibit a fast response time, an acceptable reproducibility and long-term stability. These results indicate that the proposed potentiometric sensor can be a promising and reliable tool for the rapid determination of total phenolic content in wine samples.

Sign in / Sign up

Export Citation Format

Share Document