Blum and Eberl (2004) presented a new technique for determining the surface area of clay minerals in sediment samples by measuring the amount of poly-vinylpyrrolidone (PVP) [CAS#9003-39-8] adsorbed by a sample, and explained how the surface-area determination can be used to determine quantitatively the smectite content of the samples. In the previous method for determining surface area by PVP uptake (Blum and Eberl, 2004; also see the erratum relating to that paper published on p. 214 of the present issue), ~50 mg of Na-saturated smectite was dispersed in 5 mL of water, and 1 mL of 10 wt.%...

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