Topic 2 - Errors
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10 Terms
what are systematic errors?
affects accuracy
can be detected and avoided
what are the types of systematic errors?
instrumental errors analyst errors
what are instrumental errors?
faulty equipment uncalibrated equipment
what are analyst errors?
spillage mistakes in recording volume
what are random errors?
experimental uncertainty that occurs in any measurements
affects precision
can random errors be detected?
cannot be avoided and detected can only be minimized
equal number of + and - errors so they cancel each other
what is calibration?
process of measuring known quantity and determine the relationship between the measured signal and the concentration of analyte
what are the two types of approaches in linear regression calibration graph?
standard curve method
standard addition method
what is the standard curve method?
prepare a series of solutions with a range of known analyte concentration
what is standard additions method?
prepare a series of solutions with a range of analyte concentration added to sample