Method for detecting polar compounds in chemically derived high-salt organic wastewater

A method for detecting polar compounds in chemically derived high-salinity organic wastewater comprises the following steps: adjusting the pH value of the high-salinity organic wastewater to be strongly acidic, dividing a water sample into two parts, adjusting the pH value of one part of the water sample to be 6-7, and adjusting the pH value of the other part of the water sample to be 2-3; the method comprises the following steps: taking a water sample with the pH value of 6-7, adding FMOC-Cl, sodium tetraborate and acetonitrile, carrying out derivatization reaction at room temperature in a dark place, extracting FMOC-derivatives by using an HLB (Hydrophile Lipophile Balance) column and removing by-products of the derivatization reaction, and screening the FMOC-derivatives by using UPLC-QTOF MS; the method comprises the following steps: taking a water sample with the pH value of 2-3, extracting polar compound components by using HLB (Hydrophile-Lipophile Balance), nitrogen-blowing eluent until the eluent is d