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{"ops":[{"insert":"\t(a)\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0"},{"attributes":{"bold":true},"insert":"The total concentration of dissolved inorganic carbon in a sample of sedimentary pore water is 5.576 mmol\/kg.\u00a0Isotopic analysis of this DIC yields a \u03b4"},{"attributes":{"bold":true,"script":"super"},"insert":"13"},{"attributes":{"bold":true},"insert":"C = -37\u2030 "},{"attributes":{"italic":true,"bold":true},"insert":"vs"},{"attributes":{"bold":true},"insert":". PDB.\u00a0It\u2019s known that the pore water initially contained some CH"},{"attributes":{"bold":true,"script":"sub"},"insert":"4"},{"attributes":{"bold":true},"insert":" with \u03b4"},{"attributes":{"bold":true,"script":"super"},"insert":"13"},{"attributes":{"bold":true},"insert":"C = -84\u2030 "},{"attributes":{"italic":true,"bold":true},"insert":"vs"},{"attributes":{"bold":true},"insert":". PDB, that the CH"},{"attributes":{"bold":true,"script":"sub"},"insert":"4"},{"attributes":{"bold":true},"insert":" has been converted quantitatively to CO"},{"attributes":{"bold":true,"script":"sub"},"insert":"2"},{"attributes":{"bold":true},"insert":", that pore waters in which no CH"},{"attributes":{"bold":true,"script":"sub"},"insert":"4"},{"attributes":{"bold":true},"insert":" was oxidized have \u03b4"},{"attributes":{"bold":true,"script":"super"},"insert":"13"},{"attributes":{"bold":true},"insert":"C = -12\u2030 "},{"attributes":{"italic":true,"bold":true},"insert":"vs"},{"attributes":{"bold":true},"insert":". PDB, and that the pore water in question has neither lost nor gained DIC except by the oxidation of CH"},{"attributes":{"bold":true,"script":"sub"},"insert":"4"},{"attributes":{"bold":true},"insert":".\u00a0"},{"attributes":{"italic":true,"bold":true},"insert":"What were the initial concentrations of dissolved inorganic carbon and CH"},{"attributes":{"italic":true,"bold":true,"script":"sub"},"insert":"4"},{"attributes":{"italic":true,"bold":true},"insert":" in the pore water?\u00a0"},{"insert":"\n"}]}

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