Sample pretreatment column

Sodium column: the transition metal and heavy metal ions in the adsorbed sample.
Silver column: Adsorption of high concentrations of halogen (Cl-, Br-, I-) in the sample.
Solid phase extraction column: adsorbs hydrophobic organic matter in the sample.

Needle filter: filter out the solid particles of the sample to avoid clogging the chromatographic column.

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