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Adsorption isotherms in solutions with ionic strengths of 0.01 at 25 °C were measured over the arsenite concentration range 10-7-10~* ***5 M and the pH range 4-10. These isotherms obeyed equations of the Langmuir type. Curves of arsenite removed by iron hydroxide from a constant volume of solution, as a function of pH, go through a maximum at approximately pH 7. The pH of the zero point of charge (pHzpc) of the suspension was measured as a function of the amount of adsorption of arsenite and was found to decrease as more arsenite adsorbed.

Three carbonaceous chondrites were examined for water-extractable amino acids. The Murchison Murray specimens were found to be of similar amino acid composition. This similarity suggests that these amino acids in are indigenous to type II carbonaceous chondrites. The Allende (type III) carbonaceous chondrite was found to be essentially devoid of amino acids on the basis of on identical analysis.

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Alcohols, aldehydes and ketones identified in the Murchison C2 chondrite include: methanol, ethanol, 2‐propanol, butyl alcohols, formaldehyde, acetaldehyde, propionaldehyde, acetone, 2‐butanone, 3‐pentanone and 2‐pentanone.

Amino acids have been found in aqueous extracts of a C2 carbonaceous chondrite recovered from Antarctica. The composition of the amino acids strongly suggests that they have a meteoritic origin. Comparison of these results with those obtained with other C2 chondrites supports the view that Antarctic meteorites have not been significantly altered by terrestrial processes since their fall.

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