Comparison of photon correlation spectroscopy with photosedimentation analysis for the determination of aqueous colloid size distributions

Rees, T. F.

Abstract:

Photon correlation spectroscopy (PCS) utilizes the Doppler frequency shift of photons scattered off particles undergoing Brownian motion to determine the size of colloids suspended in water. Photosedimentation analysis (PSA) measures the time-dependent change in optical density of a suspension of colloidal particles undergoing centrifugation. A description of both techniques, important underlying assumptions, and limitations are given. Results for a series of river water samples show that the colloid-size distribution means are statistically identical as determined by both techniques. This also is true of the mass median diameter (MMD), even though MMD values determined by PSA are consistently smaller than those determined by PCS. Because of this small negative bias, the skew parameters for the distributions are generally smaller for the PCS-determined distributions than for the PSA-determined distributions. Smaller polydispersity indices for the distributions are also determined by PCS. -from Author

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Article

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70015757

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Rees, T. F.

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2781

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English

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Water Resources Research

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Comparison of photon correlation spectroscopy with photosedimentation analysis for the determination of aqueous colloid size distributions; 1990; Article; Journal; Water Resources Research; Rees, T. F.