How should turbidity samples be mixed?

When mixing turbidity samples, it is crucial to avoid introducing air bubbles into the sample. Air bubbles can interfere with the measurement of turbidity because they scatter light in ways that are not related to the suspended particles within the sample. This can lead to inaccurate readings and compromise the integrity of the data being collected.

Mixing samples gently enough to keep them homogeneous while preventing air inclusion is standard practice in laboratory settings. This ensures that the suspended particles remain uniformly distributed throughout the sample without the confounding effects of air bubbles, which can distort the optical measurements used to assess turbidity.

The other methods of mixing, while they may achieve a degree of homogenization, could risk introducing air into the sample, thus compromising the results. Maintaining the sample's accuracy is of paramount importance when assessing turbidity, so using techniques that protect against the inclusion of air is essential.