Chemical detection methods Flashcards
random sampling
taking samples from points entirely at random.
taking samples from points entirely at random.
random sampling
Systematic sampling
taking samples across a grid or other pattern to get an idea of the entire area
taking samples across a grid or other pattern to get an idea of the entire area
Systematic sampling
Titration
adding another chemical into your sample sloky t determine how much analyte is present, takes a long time but fairly accurate.
adding another chemical into your sample sloky t determine how much analyte is present, takes a long time but fairly accurate.
Titration
spectrophotometry
analyzing chemical presence using spectral lines, the higher the absorbtion, the more is present.
analyzing chemical presence using spectral lines, the higher the absorbtion, the more is present.
spectrophotometry
Chromatography
passing a mobile phase over a stationary phase, analytes will partialy stick to the stationary phase and you can mesure how long it takes in order to identify chemicals.
passing a mobile phase over a stationary phase, analytes will partialy stick to the stationary phase and you can mesure how long it takes in order to identify chemicals.
Chromatography
gass chromatography
a method where the stationary phase is a long glass tube with many twists, and the mobile phase is a gass.
a method where the stationary phase is a long glass tube with many twists, and the mobile phase is a gass.
gass chromatography
blanks
running a test where you know there is no analyte to see what kind of results it gives.
running a test where you know there is no analyte to see what kind of results it gives.
blanks
calibration
doing multiple tests with known amounts of analyte to see how it behaves
doing multiple tests with known amounts of analyte to see how it behaves
calibration
spiking
adding a known amount of analyte to the unknown and seeing how that changes the signal
adding a known amount of analyte to the unknown and seeing how that changes the signal
spiking
LOQ
Limit of Quantification, the lowest signal where the amount can be determined
Limit of Quantification, the lowest signal where the amount can be determined
LOQ
LOD
limit of detection, the lowest signal where we can say the analyte is present
limit of detection, the lowest signal where we can say the analyte is present
LOD
gas chromatography invented in…
1952, GCMS follwed in 1970
TCD invented in ….
1957
