Which of the following does NOT typically affect the quality of water used for analytical purposes?

The quality of water used for analytical purposes can be significantly influenced by various factors. Temperature, while an important parameter in many chemical processes and reactions, does not typically alter the inherent composition or quality of the water itself. Instead, it mainly affects the solubility and reaction rates of substances dissolved in water.

On the other hand, the presence of microorganisms, minerals, and organic compounds can directly impact the physical and chemical characteristics of water. Microorganisms can lead to contamination, affecting results of microbiological assays. The presence of minerals can influence ionic strength, conductivity, and may interfere with analytical measurements, depending on the technique used. Organic compounds may introduce variability in results, particularly in methods sensitive to organic perturbations, such as chromatography or mass spectrometry. Hence, temperature stands apart as a factor that does not change the composition or baseline quality of water in the context of analytical use.