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Phenol, also known as carbolic acid, is an aromatic organic compound with the molecular formula C6H5OH. It is a white crystalline solid that is volatile. The molecule consists of a phenyl group (−C6H5) bonded to a hydroxyl group (−OH). It is mildly acidic and requires careful handling due to its propensity to cause chemical burns
Here is a video which shows how you can replace the gold seal inside the reducing nut. The debris on the gold plate or even scratches on it can cause several problems for chromatogram such as split peaks and so forth.
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