In a manner relating to or by means of chromatography; using chromatographic methods or principles.
From 'chromatographic' + suffix '-ally' (in the manner of). A technical adverb formed in the 20th century for scientific discourse.
When scientists say they 'chromatographically verified' something, they mean they used the most rigorous separation method available—it's basically the scientific equivalent of 'we're absolutely certain.'
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