Abstract--The layer structure of kaolinite from Twiggs, Georgia and fire-clay type kaolinite (Frantex B, from France), particle size separates 2-0-2 #m was studied by high resolution electron microscopy after embedment in Spurr low-viscosity Epoxy media and thin sectioning normal to the (001) planes by an ultramicrotome. Images of the (001) planes (viewed edge-on) of both kaolinites were spaced at 7 .~ and generally aligned in parallel, with occasional bending into more widely spaced images of about l0 • interval. Some of the 10 A images converged to 7 /~ at one or both ends, forming ellipse-shaped islands 80 to 130 ~ thick and 300 to 500 ~, long. The island areas and interleaved 10 ~ layers between 7 A layers may represent a residue of incomplete weathering of mica to kaolinite.The proportions of micaceous occlusions were too small and the layer sequences too irregular to be detected by X-ray diffraction. The lateral continuity of the layers through the 7-10-7/~ sequence in a kaolinite particle would partially interrupt or prevent expansion in dimethyl sulfoxide (DMSO) and other kaolinite intercalating media. Discrete mica particles were also observed with parallel images at 10 A, as impurities in both kaolinites. The small K content of the chemical analyses of the kaolinite samples is accounted for as interlayer K, not only in discrete mica particles but also in the micaceous occlusions.

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Aminoethyl cellulose (AEC) was thiolated with S-acetylmercaptosuccinic anhydride. The S-acetyl protective groups were removed at pH 11.5 to yield thiolated aminoethyl cellulose (TAEC) preparations with 0.077 to 0.109 × 10−3 mole SH per g TAEC. TAEC bound approximately 0.1 × 10−3 mole of p-mercuribenzoate/g. Mercury was removed from fish protein by stirring solubilized tuna fish protein concentrate with TAEC at pH values from 6 to 11. The fish protein was solubilized by either a high temperature, high pH process, or by succinylation. The amount of mercury removed was pH dependent, being maximal at pH values 6.4 and 9. Under reducing conditions, that is, TAEC treated with dithiothreitol, and the mercury removed under nitrogen, 80% removal from a 2% protein solution at pH 7 was achieved. Srafion NMRR, a commercial chelator for dissolved organic and inorganic mercuric salts, was ineffective in removing mercury from soluble fish protein concentrate.