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What matters for ion exchange: net or local charge?

Ion chromatography or ion-exchange chromatography (sadly) does not totally rely on net/local charge. Imagine the separation of standard simple inorganic ions such as fluoride, chloride, bromide and ...
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What's a good high precision analysis technique (after GC) to measure trace isopropanol in water samples?

Other than finding any way to get access to a compatible GC (and yes, you can change columns), one might: Extract the IPA into an organic solvent and then try an IPA shoot. "Salting" the ...

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