1
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Instrumental Analysis Questions and
Answers (100% Correct Answers) Already
Graded A+
Quality Assurance [ Ans: ] All encompassing system that controls
data generation
Quality Control [ Ans: ] Refers to the policies, procedures, and
practices designed to assure data quality
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Standard Operating Procedure (SOP) [ Ans: ] A detailed
description of how a procedure is to be executed
Includes safety info, personnel qualifications, calibration, sample
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collection/prep, troubleshooting, calculations etc.
Raw Data [ Ans: ] Individual measurements
Treated Data [ Ans: ] Concentrations derived from raw data by
use of calibration method
Results [ Ans: ] Quantities reported after statistical analysis of
treated data
Use Objective [ Ans: ] States purpose for which results will be
used
Limit of Detection [ Ans: ] Lowest concentration of analyte that
can be unambiguously detected but not necessarily quantified;
usually defined as the concentration of the analyte that would
give a signal equal to that of the blank plus 3sb (3 times the
standard deviation of the blank)
Limit of Quantification [ Ans: ] Lowest concentration that can be
determined with acceptable accuracy and precision; typically
equal to the signal of the blank plus 10sb
Specifications [ Ans: ] States how good the numbers have to be
and what precautions to take in the analytical procedure
, 2
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False positive [ Ans: ] Says that the concentration exceeds the
legal limit when, in fact, the concentration is below a legal limit
False negative [ Ans: ] Says that the concentration is below the
limit when it is actually above the limit
Selectivity (specificity) [ Ans: ] Means being able to distinguish
analyte from other species in the sample
Sensitivity [ Ans: ] Capability of responding reliably and
measurably to changes in analyte concentration
Method blank [ Ans: ] Sample containing all components except
analyte, and is taken through all steps of the analytical procedure
Reagent blank [ Ans: ] Similar to method blank, but it has not
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been subjected to all sample preparation procedures
Field blank [ Ans: ] Similar to a method blank, but it has been
exposed to the site of sampling
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Matrix [ Ans: ] Everything in the sample other than the analyte
Spike [ Ans: ] A known quantity of analyte added to a sample to
test whether the response to a sample is the same as that
expected from a calibration curve
Calibration check [ Ans: ] Analysis of solutions formulated to
contain known concentrations of analyte
Standard operating procedure [ Ans: ] States what steps will be
taken and how they will be carried out
Reporting limit [ Ans: ] The concentration below which
regulations say that a given analyte is reported as "not detected,"
which does not mean that analyte is not observed
Internal standard [ Ans: ] A known amount of a compound,
different from analyte, that is added to the unknown. A signal
from the analyte is compared with the signal from the internal
standard to find out how much analyte is present
- method of choice when the instrument response or amount of
sample analyzed varies from run to run
For Expert help and assignment solutions, +254707240657
Instrumental Analysis Questions and
Answers (100% Correct Answers) Already
Graded A+
Quality Assurance [ Ans: ] All encompassing system that controls
data generation
Quality Control [ Ans: ] Refers to the policies, procedures, and
practices designed to assure data quality
© 2025 Assignment Expert
Standard Operating Procedure (SOP) [ Ans: ] A detailed
description of how a procedure is to be executed
Includes safety info, personnel qualifications, calibration, sample
Guru01 - Stuvia
collection/prep, troubleshooting, calculations etc.
Raw Data [ Ans: ] Individual measurements
Treated Data [ Ans: ] Concentrations derived from raw data by
use of calibration method
Results [ Ans: ] Quantities reported after statistical analysis of
treated data
Use Objective [ Ans: ] States purpose for which results will be
used
Limit of Detection [ Ans: ] Lowest concentration of analyte that
can be unambiguously detected but not necessarily quantified;
usually defined as the concentration of the analyte that would
give a signal equal to that of the blank plus 3sb (3 times the
standard deviation of the blank)
Limit of Quantification [ Ans: ] Lowest concentration that can be
determined with acceptable accuracy and precision; typically
equal to the signal of the blank plus 10sb
Specifications [ Ans: ] States how good the numbers have to be
and what precautions to take in the analytical procedure
, 2
For Expert help and assignment solutions, +254707240657
False positive [ Ans: ] Says that the concentration exceeds the
legal limit when, in fact, the concentration is below a legal limit
False negative [ Ans: ] Says that the concentration is below the
limit when it is actually above the limit
Selectivity (specificity) [ Ans: ] Means being able to distinguish
analyte from other species in the sample
Sensitivity [ Ans: ] Capability of responding reliably and
measurably to changes in analyte concentration
Method blank [ Ans: ] Sample containing all components except
analyte, and is taken through all steps of the analytical procedure
Reagent blank [ Ans: ] Similar to method blank, but it has not
© 2025 Assignment Expert
been subjected to all sample preparation procedures
Field blank [ Ans: ] Similar to a method blank, but it has been
exposed to the site of sampling
Guru01 - Stuvia
Matrix [ Ans: ] Everything in the sample other than the analyte
Spike [ Ans: ] A known quantity of analyte added to a sample to
test whether the response to a sample is the same as that
expected from a calibration curve
Calibration check [ Ans: ] Analysis of solutions formulated to
contain known concentrations of analyte
Standard operating procedure [ Ans: ] States what steps will be
taken and how they will be carried out
Reporting limit [ Ans: ] The concentration below which
regulations say that a given analyte is reported as "not detected,"
which does not mean that analyte is not observed
Internal standard [ Ans: ] A known amount of a compound,
different from analyte, that is added to the unknown. A signal
from the analyte is compared with the signal from the internal
standard to find out how much analyte is present
- method of choice when the instrument response or amount of
sample analyzed varies from run to run
