Pyrite removal from kerogen without altering organic matter: the chromous chloride method

Thermal transformations of organic and inorganic sulfur in Type II kerogen quantified by S-XANES

“…A portion of the HCl/HF residues were then treated with CrCl 2 to oxidize the pyrite following the procedure used in Acholla and Orr (1993). The resulting organic residues are expected to be free of pyrite and this result is confirmed by S-XANES data subsequently presented in this paper.…”

Acid demineralization with critical point drying: A method for kerogen isolation that preserves microstructure

“…The acid treatment was repeated several times to dissolve most of the minerals. Pyrite cannot be dissolved by the acids used here, however it can be removed by acidic chromous chloride without causing chemical alteration of kerogen [22]. This technique was not implemented during this study, and the resulting kerogen isolate contained pyrite.…”

Stable sulfur isotope partitioning during simulated petroleum formation as determined by hydrous pyrolysis of Ghareb Limestone, Israel

“…The H 2 S was collected as Ag 2 S and the sulfate as BaSO 4 . Disulfide minerals (mainly pyrite) were reduced in a hot, acidified Cr(II) solution in a nitrogen atmosphere to form H 2 S that was collected as Ag 2 S. This method has been shown to cause minimal damage to the organic matter in comparison to other methods (Acholla and Orr, 1993). Precision of the sulfur-species analyses was Ϯ10%.…”