Turbidimetry versus nephelometry: which statement is true?

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Multiple Choice

Turbidimetry versus nephelometry: which statement is true?

The key idea is what each method detects in a turbid sample. In turbidity measurements you shine light through the sample and watch how much of that light makes it to the detector on the far side. Particles in the suspension scatter and absorb light, so more turbidity means less transmitted light. In nephelometry you place the detector to collect light that has been scattered by the particles, usually at an angle away from the direct beam. The signal grows as more light is scattered, which depends on particle concentration and size. So the true statement is that turbidity measures transmitted light, while nephelometry measures light scattered from the turbid solution. This distinction explains why the two techniques have different sensitivities and are used in different contexts.

The key idea is what each method detects in a turbid sample. In turbidity measurements you shine light through the sample and watch how much of that light makes it to the detector on the far side. Particles in the suspension scatter and absorb light, so more turbidity means less transmitted light. In nephelometry you place the detector to collect light that has been scattered by the particles, usually at an angle away from the direct beam. The signal grows as more light is scattered, which depends on particle concentration and size. So the true statement is that turbidity measures transmitted light, while nephelometry measures light scattered from the turbid solution. This distinction explains why the two techniques have different sensitivities and are used in different contexts.

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