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3. Long chain n-alkanes are classified as those with carbon chain length greater than 23 (Line 241), however the ratio ¦²C21-/¦²C22+ is used to characterize the degradation of longer-chain n-alkanes to relatively shorter ones. Why ¦²C22+ and NOT ¦²C23+? This needs careful explanation.£¨ÎÒµÄʵÑéÖз¢ÏÖ̼Á´ÔÚ23ÒÔÉϵÄÃ÷ÏÔ·¢ÉúÁ˽µ½â£©
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