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Related Concept Videos

Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte properties and...

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Hand-held lead analyzer.

C Yarnitzky1, J Wang, B Tian

  • 1Department of Chemistry and Biochemistry, New Mexico State University, Box 30001, Las Cruces, NM 88003 8001, USA.

Talanta
|October 31, 2008
PubMed
Summary
This summary is machine-generated.

A new portable electrochemical analyzer enables sensitive, reliable field testing for trace lead. This handheld device offers convenient, accurate lead quantification in drinking water for various applications.

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Area of Science:

  • Analytical Chemistry
  • Electrochemistry
  • Environmental Science

Background:

  • Decentralized testing for trace lead is crucial for environmental and clinical monitoring.
  • Existing centralized stripping operations offer high sensitivity but lack portability.
  • Field-deployable instruments are needed to meet the demands of on-site lead analysis.

Purpose of the Study:

  • To design and describe a hand-held electrochemical analyzer for field screening of trace lead.
  • To assess the instrument's performance in terms of sensitivity, reliability, and portability.
  • To evaluate the device's suitability for decentralized lead testing applications.

Main Methods:

  • Development of a stripping-based electrochemical analyzer with low size, weight, and power consumption.
  • Utilization of screen-printed disposable sensors for sample analysis.
  • Linear regression analysis to correlate instrument response with lead concentration (20–300 µg/L).

Main Results:

  • The analyzer demonstrated high sensitivity and reliability comparable to centralized methods.
  • A linear response was observed between the instrument's signal and lead levels.
  • Excellent correlation (r=0.999) was achieved when compared to established lead measurement instruments.
  • Convenient quantification of lead in small, quiescent, non-deaerated drinking water samples was demonstrated.

Conclusions:

  • The developed hand-held electrochemical analyzer is suitable for decentralized trace lead testing.
  • Its portability, sensitivity, and reliability offer significant advantages for field applications.
  • The instrument shows great promise for environmental, clinical, and industrial lead monitoring.