In nephelometry, what is the relationship between detector response and concentration?

In nephelometry, the principle involves measuring the light scattered by particles in a solution. When the concentration of those particles increases, the amount of light scattered also increases. This relationship leads to a direct proportionality between the detector response (the amount of light detected) and the concentration of the substance being measured. As more particles scatter more light, the detector's response reflects this increase, allowing for a quantitative assessment of the concentration based on the detected light intensity.

The other options do not accurately describe this relationship. An inverse proportionality would suggest that as concentration increases, the detector response decreases, which is not the case in nephelometry. Similarly, stating that the response remains constant would imply no change in detector readings regardless of concentration, which also does not reflect the actual behavior of light scattering in this technique. A logarithmic relationship would denote a non-linear response, which is not how the detector in nephelometry behaves within typical concentration ranges. Thus, direct proportionality accurately describes the relationship observed in nephelometric measurements.