High-Sensitivity Micro-Gas Chromatograph–Photoionization Detector for Trace Vapor Detection

ACS Sensors ◽  
2021 ◽  
Author(s):  
Maxwell Wei-Hao Li ◽  
Abhishek Ghosh ◽  
Anandram Venkatasubramanian ◽  
Ruchi Sharma ◽  
Xiaolu Huang ◽  
...  
Keyword(s):  
High Sensitivity ◽  
Gas Chromatograph ◽  
Vapor Detection ◽  
Photoionization Detector

Design of Photoionization Detector Based on the Miniature Gas Chromatography

2013 ◽  
Vol 823 ◽  
pp. 291-295 ◽  
Author(s):  
Shou Chen Chai ◽  
Peng Yang ◽  
Cheng Jia Yang ◽  
Chun Li Cai ◽  
Na Yu
Keyword(s):  
Gas Chromatography ◽  
Detection Limit ◽  
Ionization Chamber ◽  
High Sensitivity ◽  
Fast Response ◽  
Low Detection Limit ◽  
Photoionization Detector ◽  
Key Factor ◽  
The Stability ◽  
Sensitivity Detection

In the space restricted airtight environment that people lives in, detecting harmful gas by miniature gas chromatography is the practical requirement at present, however, PIDs performance is key factor that restrict the application of miniature gas chromatography, the redesign of the detectors gas route in this paper aiming at improve detectors stability observably, and schemed out miniature PID with high sensitivity, low detection limit and fast response. The result of the experiment shows that the detection limit is 0.04ppm, the sensitivity is 101mv/ppm,the stability is 0.04×10-6/24h,meeting the project requirement. Keywords: photoionization detector; ionization chamber; sensitivity; detection limit;

scholarly journals Evaluation of direct reading photoionization detector performance under various operational parameters

2021 ◽  
Vol 8 (2) ◽  
pp. 123-128
Author(s):  
Amir Hossein Khoshakhlagh ◽  
Farideh Golbabaei ◽  
Mojtaba Beygzadeh ◽  
Francisco Carrasco-Marín ◽  
Seyed Jamaleddin Shahtaheri
Keyword(s):  
Relative Humidity ◽  
Dynamic Range ◽  
Reference Method ◽  
Operational Parameters ◽  
Direct Reading ◽  
Detector Performance ◽  
Vapor Detection ◽  
Sample Concentration ◽  
Photoionization Detector ◽  
Before And After

Background: A hand-held portable direct-reading monitor, including photoionization detector (PID) is renowned for its good sensitivity, considerable dynamic range, and nondestructive vapor detection ability in comparison to the tardy response of the PID in gas chromatography (GC), which its application has been restricted. In this study, the performance of a PID system (MultiRAE Lite) was evaluated as a replacement of GC in the measurement of toluene in a dynamic adsorption system. Methods: The test was done at different relative humidity levels (30%, 50%, and 80%), temperatures (21, 30, 40° C), and toluene concentrations (20, 100, 200, and 400 ppm). Results: The PID achieved 48% of all measurements meeting the comparison criterion. The results showed that the performance of the PID could be altered by the variables. The best performance of the PID was at temperature of 21° C, the relative humidity of 50%, and concentration of 200 ppm with the percentage of readings achieving the criterion of comparison to 58%, 54%, and 52%, respectively. The averages of the PID readings (mean ± SD at 200 ppm= 207.9 ± 8.7) were higher than the reference method measurements averages (mean ± SD at 200 ppm= 203.5 ± 5.8). The regression analysis of the toluene results from the PID and the reference method results indicated that the measurements were significantly correlated (r2 = 0.93). Conclusion: According to the results, the device response is linear. Therefore, the findings are acceptable in adsorption studies. In this way, the measurement of the sample concentration should be performed using the same instrument before and after the reactor in order to calculate the adsorption efficiency.

scholarly journals Towards a hand-held, fast, and sensitive gas chromatograph-ion mobility spectrometer for detecting volatile compounds

2020 ◽  
Author(s):  
André Ahrens ◽  
Stefan Zimmermann
Keyword(s):  
Gas Phase ◽  
Ion Mobility ◽  
Atmospheric Pressure ◽  
Response Times ◽  
Atmospheric Pressure Chemical Ionization ◽  
Real Life ◽  
High Sensitivity ◽  
Resolving Power ◽  
Gas Chromatograph ◽  
Ionization Processes

AbstractIon mobility spectrometers can detect gaseous compounds at atmospheric pressure in the range of parts per trillion within a second. Due to their fast response times, high sensitivity, and limited instrumental effort, they are used in a variety of applications, especially as mobile or hand-held devices. However, most real-life samples are gas mixtures, which can pose a challenge for IMS with atmospheric pressure chemical ionization mainly due to competing gas-phase ionization processes. Therefore, we present a miniaturized drift tube IMS coupled to a compact gas chromatograph for pre-separation, built of seven bundled standard GC columns (Rtx-Volatiles, Restek GmbH) with 250 μm ID and 1.07 m in length. Such pre-separation significantly reduces chemical cross sensitivities caused by competing gas-phase ionization processes and adds orthogonality. Our miniaturized GC-IMS system is characterized with alcohols, halocarbons, and ketones as model substances, reaching detection limits down to 70 pptv with IMS averaging times of just 125 ms. It separates test mixtures of ketones and halocarbons within 180 s and 50 s, respectively. The IMS has a short drift length of 40.6 mm and reaches a high resolving power of RP = 68.

Combined headspace single-drop microextraction and solid-phase microextraction for the determination of phenols as their methyl ethers by gas chromatography-mass spectrometry

2017 ◽  
Vol 9 (46) ◽  
pp. 6590-6598 ◽  
Author(s):  
Archana Jain ◽  
Soumitra Soni ◽  
Kishan Reddy-Noone ◽  
Aradhana K. K. V. Pillai ◽  
Krishna K. Verma
Keyword(s):  
Solid Phase Microextraction ◽  
Solid Phase ◽  
High Sensitivity ◽  
Large Mass ◽  
Gas Chromatography Mass Spectrometry ◽  
Gas Chromatograph ◽  
Single Drop ◽  
Single Drop Microextraction ◽  
Single Drop Extraction

A combination of headspace large volume single drop extraction and solid phase microextraction permitted attainment of high sensitivity by transferring an overall large mass of analytes into a gas chromatograph.

scholarly journals ANALYSIS OF FENPROPATHRIN, LAMBDA-CYHALOTHRIN, AND CHLOROTHALONIL IN POTATO AND TOMATO SAMPLES USING GAS CHROMATOGRAPHY WITH AN ELECTRON CAPTURE DETECTOR

2018 ◽  
Vol 10 (1) ◽  
pp. 70
Author(s):  
Nadia Rahmiani ◽  
Harmita . ◽  
Herman Suryadi
Keyword(s):  
Gas Chromatography ◽  
Electron Capture ◽  
Limit Of Detection ◽  
High Sensitivity ◽  
Electron Capture Detector ◽  
Gas Chromatograph ◽  
Vegetable Sample ◽  
Lambda Cyhalothrin ◽  
Limit Of Quantitation ◽  
Validation Tests

Objective: This study aimed to analyze pesticide contents in potato and tomato samples.Methods: In the present study, we determined the presence of the pesticides fenpropathrin, lambda-cyhalothrin, and chlorothalonil in conventionaland organic potatoes and tomatoes using a gas chromatograph equipped with an electron capture detector and validated the associated methods.Acetone-based extraction was performed using the Dutch mini-Luke method with minimal weights and volumes.Results: Validation tests showed a range of 70–120% and precision of ≤20%, and linearity tests on the three standard pesticides gave r values of≥0.9990 for all three pesticides. Limit of detection and limit of quantitation values showed high sensitivity, although in vegetable sample analyses,none of the three pesticides were detected.Conclusion: Our data show that the chosen method for analysis of the pesticides fenpropathrin, lambda-cyhalothrin, and chlorothalonil in potatoesand tomatoes is valid and that the marketed potatoes and tomatoes meet the SNI 7313: 2008 standard for “Maximum Limits of Pesticide Residues onAgricultural Products” and the associated Japanese standards

Flow-through microfluidic photoionization detectors for rapid and highly sensitive vapor detection

Lab on a Chip ◽  
2015 ◽  
Vol 15 (14) ◽  
pp. 3021-3029 ◽  
Author(s):  
Hongbo Zhu ◽  
Robert Nidetz ◽  
Menglian Zhou ◽  
Jiwon Lee ◽  
Sanketh Buggaveeti ◽  
...  
Keyword(s):  
Vapor Detection ◽  
Highly Sensitive ◽  
Photoionization Detector ◽  
Flow Through

Rapid and sensitive microfluidic photoionization detector fabricated on a chip.

scholarly journals Photonic crystal fiber interferometer for chemical vapor detection with high sensitivity

2009 ◽  
Vol 17 (3) ◽  
pp. 1447 ◽  
Author(s):  
Joel Villatoro ◽  
Mark P. Kreuzer ◽  
Rajan Jha ◽  
Vladimir P. Minkovich ◽  
Vittoria Finazzi ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Chemical Vapor ◽  
High Sensitivity ◽  
Vapor Detection ◽  
Crystal Fiber

Determination of Eight Organochlorine Pesticides at Low Nanogram/Liter Concentrations in Groundwater Using Filter Disk Extraction and Gas Chromatography

1992 ◽  
Vol 75 (6) ◽  
pp. 1091-1099 ◽  
Author(s):  
Bruce A Tomkins ◽  
Roosevelt Merriweather ◽  
Roger A Jenkins ◽  
Charles K Bayne
Keyword(s):  
Organochlorine Pesticides ◽  
Environmental Protection Agency ◽  
Anhydrous Sodium Sulfate ◽  
Capillary Column ◽  
High Sensitivity ◽  
Gas Chromatograph ◽  
Method Detection Limit ◽  
Limit Values ◽  
Groundwater Samples

Abstract Eight organochlorine pesticides may be quantitated routinely at levels below 10 parts per trillion (ng/L) in natural groundwaters. Analytes are extracted rapidly from 1 L groundwater samples by using conditioned Teflon filter disks impregnated with silica containing bonded octadecyl phase. Filter is dried briefly under vacuum, and pesticides are eluted with 10 mL ethyl acetate. The extract is dried with about 1 g anhydrous sodium sulfate and then concentrated to exactly 1 mL. Pesticides are separated in a gas chromatograph equipped with a capillary column, detected by a high-sensitivity electron capture detector, and quantitated by the method of external standards. Certified reporting limit (CRL) values for the 8 pesticides ranged between 2 and 7 ng/L. Preliminary data demonstrated that the organochlorine pesticides could be collected on the filter disks and stored up to 4 weeks in the dark at either refrigerated or ambient temperature without obvious degradation of the sample. Calculated CRL values are comparable (within a factor of 2) to method detection limit values defined by the U.S. Environmental Protection Agency.

Conductive Polypyrrole/Polyurethane Composite Fibers for Chloroform Gas Detection

2013 ◽  
Vol 750-752 ◽  
pp. 55-58 ◽  
Author(s):  
Xin Liu ◽  
Zong Yi Qin ◽  
Xiao Lin Zhang ◽  
Long Chen ◽  
Mei Fang Zhu
Keyword(s):  
High Sensitivity ◽  
Fast Response ◽  
Gas Detection ◽  
Composite Fibers ◽  
Vapor Detection ◽  
Polyurethane Composite ◽  
Response And Recovery ◽  
High Structural Stability ◽  
Conductive Fibers

Flexible conductive fibers were fabricated by in-situ chemical polymerization of pyrrole monomers on the surface of polyurethane (PU) fibers. Compact polypyrrole (PPy) surface layer were observed, and moreover, high structural stability of the composite fibers can be obtained due to interpenetrating interface formation and strong interaction between PPy layers and PU matrix. More importantly, the composite fibers exhibited high sensitivity with relative fast response and recovery time, and good reproducibility for chloroform vapor detection.

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