Question: ANALYTICAL CHEM QUESTION UPDATED! Classify the statements based on whether they describe the method of standard addition, the method of external calibration, or both. Standard

ANALYTICAL CHEM

QUESTION UPDATED!

ANALYTICAL CHEM QUESTION UPDATED! Classify the statements based on whether they describe the method of standard addition, the method of external calibration, or both.

Classify the statements based on whether they describe the method of standard addition, the method of external calibration, or both. Standard addition External calibration Both Answer Bank It is used to measure the instrument response as a function of a known analyte concentration under a set of conditions. It is the method of choice when the matrix of the sample may affect the signal. The response of the instrument must be linear in the sample matrix. It consists of a series of standard analyte solutions separate from the unknown. Matrix effects can cause the same analyte concentration in an unknown and standard to give different responses. Known quantities of a standard solution of the analyte are added to the unknown. A blank is used to correct the response from the instrument. Systematic errors can occur due to sample or standard preparation

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