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Sign Test for Matched Pairs

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The sign test for matched pairs offers a robust method for comparing two paired samples, often for the effects of an intervention in one of them. This method is very useful in situations where the underlying distribution of the data is unknown. The test compares two related samples—often pre- and post-treatment measurements on the same subjects—to determine if there are significant differences in their median values.
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Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
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Application of all solid-state 3D printed pH sensor to beverage samples using matrix matched standard.

W Lonsdale1, S Paul Shylendra1, M Wajrak2

  • 1Electron Science Research Institute, Edith Cowan University, Joondalup, WA 6027, Australia.

Talanta
|January 27, 2019
PubMed
Summary

A novel all solid-state potentiometric pH sensor using ruthenium dioxide electrodes was developed. This sensor offers accurate pH measurements in various samples, suitable for unskilled users.

Keywords:
3D printingBeverage samplesMatrix matchingRuthenium oxidepH sensor

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Sensor Technology

Background:

  • Traditional glass pH sensors face limitations in durability and suitability for certain applications.
  • Development of robust, solid-state potentiometric sensors is crucial for advanced analytical chemistry.
  • Ruthenium dioxide (RuO2) offers promising electrochemical properties for electrode development.

Purpose of the Study:

  • To develop an all solid-state potentiometric pH sensor with improved performance and usability.
  • To evaluate the sensor's accuracy, reproducibility, and performance in diverse sample matrices.
  • To adapt the sensor and protocol for low-throughput analysis by non-expert users.

Main Methods:

  • Fabrication of a potentiometric pH sensor utilizing thin-film sputter-deposited RuO2 working and reference electrodes.
  • Integration of a polyvinylbutyral-SiO2 modified RuO2 reference electrode and a 3D printed housing.
  • Implementation of a sample-equilibration and single-point calibration protocol, including matrix-matched standardization.

Main Results:

  • The developed sensor demonstrated a linear pH response (-55.7 mV/pH, R² = 0.9997) and good reproducibility (hysteresis < 2 mV).
  • An accuracy of ±0.2 pH was achieved in various sample matrices using the established protocol.
  • Matrix-matched standardization improved accuracy to ±0.1 pH compared to commercial glass pH sensors.

Conclusions:

  • The all solid-state potentiometric pH sensor based on RuO2 electrodes is a viable alternative to conventional sensors.
  • The developed sensor and protocol provide accurate and reproducible pH measurements.
  • The system is suitable for simplified, low-throughput analysis by unskilled users in diverse applications.