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Analytical methodology consists of technique, method, procedure, and protocol. A technique is a scientific principle that rationalizes a phenomenon through chemical measurements. A method adapts that technique for analyzing a specific sample. A procedure provides directions for performing the analysis, while a protocol establishes strict guidelines to follow during the procedure.

Classical methods separate the analyte from the sample matrix using wet chemical processes like precipitation, extraction, or distillation. Instrumental methods probe physical properties of the analyte, such as conductivity, electrode potential, light absorption or emission, and mass-to-charge ratio. Both approaches serve different analytical needs depending on sample characteristics and available equipment.

A technique is a foundational scientific principle that explains a phenomenon through chemical measurements. A method is the practical adaptation of that technique for analyzing a particular sample of interest. Essentially, a method applies a technique to solve a specific analytical problem.

Method selection depends on equipment availability, accuracy, precision, sensitivity, selectivity, robustness, ruggedness, cost, analysis time, and scale of operation. These criteria ensure the chosen method meets the analytical requirements while considering practical constraints. Different applications prioritize different factors based on project goals.

A protocol provides strict guidelines that must be adhered to while performing an analytical procedure. These detailed guidelines ensure consistency, reproducibility, and reliability of results across different analyses and analysts. Following established protocols minimizes variability and supports sample preparation for analysis overview standards.

Selectivity refers to an analytical method's ability to measure the analyte of interest without interference from other components in the sample matrix. High selectivity ensures accurate quantification by distinguishing the target analyte from other substances present. This criterion is essential when analyzing complex samples containing multiple compounds.

A procedure is a set of directions outlining how to perform an analysis using an analytical method. A protocol is the detailed, strict guidelines that must be followed while executing that procedure. Protocols ensure standardization and quality, making procedures reproducible and reliable across different laboratories and analysts.