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Tag Archives: instrument
Instrumentation for Flow Injection Analysis
The basic components of a flow injection analyzer are shown below and include a pump for propelling the carrier stream and reagent streams, a means for injecting the sample into the carrier stream, and a detector for monitoring the composition … Continue reading
Flow-Injection Analysis
Flow injection analysis (FIA) was developed in the mid-1970s as a highly efficient technique for the automated analyses of samples. Unlike a centrifugal analyzer, in which the number of samples is limited by the transfer disk’s size, FIA allows for … Continue reading
Loop Injector for HPLC
The operating pressure of an HPLC is sufficiently high that we cannot inject the sample into the mobile phase by inserting a syringe through a septum (as we can do in gas chromatography). Instead, we inject the sample using a … Continue reading
Posted in Illustration
Tagged chromatography, HPLC, instrument, liquid chromatography, loop injector, separation
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HPLC Pumps
A typical HPLC includes between 1–4 reservoirs for mobile phase solvents. The mobile phase solvents are pulled from their reservoirs by the action of one or more pumps. Shown here is a close-up view of an instrument with two pumps, each … Continue reading
Posted in Photo
Tagged chromatography, HPLC, instrument, liquid chromatography, pump, separation
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HPLC Instrumentation
The photo below shows an example of a typical HPLC instrument with insets showing close-up views of the pumps that move the mobile phase through the system, and the plumbing used to inject the sample into the mobile phase. This particular instrument … Continue reading
Posted in Photo
Tagged chromatography, HPLC, instrument, liquid chromatography, loop injector, pump, separation
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Gas Chromatograph
Photograph showing an example of a typical gas chromatograph with insets showing the heated injection ports—note the symbol indicating that it is hot—and the oven containing the column. This particular instrument is equipped with an autosampler for injecting samples, a … Continue reading
Schematic Diagram of a Manual Potentiostat
A potentiostat is used to set and control the potential of a working electrode. A schematic diagram for a manual potentiostat is shown here where W is the working electrode, A is the auxiliary electrode, R is the reference electrode, SW is … Continue reading
Schematic Diagram of Manual Potentiometer
To measure the potential of an electrochemical cell under a condition of zero current we use a potentiometer. Shown here is a schematic diagram for a manual potentiometer, which consists of a power supply, an electrochemical cell with a working … Continue reading
Posted in Illustration
Tagged electrochemistry, instrument, potentiometer, potentiometry
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Instrumentation for Turbidimetry and Nephelometry
Turbidimetry and nephelometry are two techniques based on the elastic scattering of radiation by a suspension of colloidal particles: (a) in turbidimetry the detector is placed in line with the source and the decrease in the radiation’s transmitted power is … Continue reading
Posted in Illustration
Tagged instrument, nephelometry, scattering, spectroscopy, turbidimetry
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Fluorescence and Phosphorescence Instrumentation
The basic instrumentation for monitoring fluorescence and phosphorescence—a source of radiation, a means of selecting a narrow band of radiation, and a detector—are the same as those for absorption spectroscopy. The unique demands of both fluorescence and phosphorescence, however, require … Continue reading
Posted in Uncategorized
Tagged fluorescence, fluorimeter, instrument, phosphorescence, photoluminescence, spectrofluorimeter, spectroscopy
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