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Mixtures of Acids03:27

Mixtures of Acids

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The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants.
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The pH of a solution containing an acid can be determined using its acid dissociation constant and initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending on the relative strength of the acids and their dissociation constants.
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The test of the kinetic molecular theory (KMT) and its postulates is its ability to explain and describe the behavior of a gas. The various gas laws (Boyle’s, Charles’s, Gay-Lussac’s, Avogadro’s, and Dalton’s laws) can be derived from the assumptions of the KMT, which have led chemists to believe that the assumptions of the theory accurately represent the properties of gas molecules.
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IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
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Gas exchange, the intake of molecular oxygen (O2) from the environment and the outflow of carbon dioxide (CO2) into the environment, is necessary for cellular function. Gas exchange during respiration occurs largely via the movement of gas molecules along pressure gradients. Gas travels from areas of higher partial pressure to areas of lower partial pressure. In mammals, gas exchange occurs in the alveoli of the lungs, which are adjacent to capillaries and share a membrane with them.
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Mechanical vibrators are instrumental in compacting newly poured concrete within formwork and around reinforcements. This process is essential to eliminate trapped air pockets and establish a dense concrete mass. One widely used method is vibrating by internal vibrators, often referred to as a poker vibrator or immersion vibrator. It is rapidly inserted through the full depth of the freshly laid concrete and slightly extends into the layer below it (which remains in a plastic state). Consistent...
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Chromatographic Fingerprinting by Template Matching for Data Collected by Comprehensive Two-Dimensional Gas Chromatography
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Vibrational Fingerprinting of Gas Mixtures Using COCO-QEPAS.

Simon Angstenberger1, Emilio Corcione2, Tobias Steinle1

  • 14th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany.

Sensors (Basel, Switzerland)
|February 13, 2026
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Summary

This study introduces coherent control in quartz-enhanced photoacoustic spectroscopy (COCO-QEPAS) for rapid trace gas detection. The method identifies and monitors multiple gases simultaneously with high accuracy and speed, even without prior knowledge of composition.

Keywords:
OPOsQEPAScoherent controlgas mixtureslinear regressionphotoacousticstrace gases

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Area of Science:

  • Analytical Chemistry
  • Spectroscopy
  • Environmental Science

Background:

  • Simultaneous monitoring of multiple trace gases is crucial for scientific and industrial applications.
  • Existing methods often require prior knowledge of gas composition and can be slow.

Purpose of the Study:

  • To develop a rapid, accurate method for identifying and monitoring arbitrary trace gases at low concentrations.
  • To demonstrate real-time analysis of complex gas mixtures without prior composition knowledge.

Main Methods:

  • Utilized coherent control in quartz-enhanced photoacoustic spectroscopy (COCO-QEPAS) combined with in situ learning.
  • Employed empirical mode decomposition for adaptive filtering and principal component regression for quantitative analysis.
  • Validated on mixtures including CH4, C2H2, C2H4, C2H6, NO2, and NH3.

Main Results:

  • Achieved real-time analysis of up to four trace gases at ppm-level, with changes monitored in seconds.
  • Demonstrated fingerprinting up to 10 ppm with a detection limit of 180 ppb for CH4.
  • Successfully recovered spectral features at the noise floor and performed quantitative analysis in the ppb regime.

Conclusions:

  • The COCO-QEPAS method enables rapid, accurate, and simultaneous detection of multiple trace gases.
  • The approach is scalable and adaptable, offering significant potential for diverse sensing applications.
  • This technique provides speed, accuracy, and simplicity critical for advanced sensing needs.