GB/T 11733-1989 Standard method for hygienic inspection of sulfate in the atmosphere of residential areas Ion chromatography is a detection standard for sulfate concentration in the air of residential areas. The standard uses Ion chromatography to determine sulfate concentration. The detection limit is 0.5 μg/mL, and the determination range is 0.5~ 50 μg/mL. When the sampling volume is 600L, the minimum detection concentration is 0.008 mg/m ³, and the measurement range is 0.008~ 0.8 mg/m ³. This method can effectively eliminate the interference of sulfur dioxide and nitrogen oxides, and the interference of sulfuric acid fog can be eliminated by using Isopropanol-absoluteethanol. During the test, sulfate particulate matter (PM) was first collected by the filter, then the sulfuric acid mist was removed with Isopropanol-absoluteethanol, and then the sulfate in the sample was extracted by elution, and finally determined by Ion Chromatography.