Standard additions involve adding known amounts of ____________to the sample to

Question

Standard additions involve adding known amounts of ____________to the sample to produce various signal responses at different concentrations.

A.an internal standard

B.the analyte of interest

C.a blank

D.a negative control

.Spikes and fortifications can be seen as___________, while matrix and reagent blanks canbe seen as _______________.

A.false positives; false negatives

B.false negatives; false positives

C.positive controls; negative controls

D.negative controls; positive controls

Assay sensitivity is represented mathematically by the slope of a calibration curve. It relates signal intensity to ______________.

A.limit of detection

B.selectivity

C.concentration

D.accuracy

E.precision

Explanation / Answer

1. One of the method of qualitative analysis is standard additions. In this, known amounts of analyte of interests are added to the unknown sample to produce some results.

Hence, the answer is option B.

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