将清洗干净并烘干的采样器的吸收膜上加入20%三乙醇胺-10%甘油-1%次亚磷酸钠混合吸收液100 μL，按规定将采样器置于博物馆环境的空气中，对其中二氧化硫和二氧化氮作被动采样3~5 d。采样结束时，将采样器的底膜及吸收膜取出，分别用水5.00 mL进行超声提取10 min，用离子色谱法测定提取液中NO₂^-、NO₃^-、SO₃^2-和SO₄^2-等含量。以IonPac AS18色谱柱为分离柱，25 mmol·L^-1氢氧化钾溶液为流动相，采用抑制型电导检测器测定。4种阴离子的检出限（3S/N）依次为0.007 8，0.008 9，0.009 0，0.008 0 mg·L^-1，加标回收率为91.0%~103%，测定值的相对标准偏差（n=6）依次为2.5%，22%，21%，29%。

In the passive sampling of sulfur dioxide and nitrogen dioxide from environmental air of museum, a portion (100 μL) of mixed absorption solution, composed of w_S 20% of TEA, w_S 10% of glyoerin and w_S 1% of sodium hypophosphite, was added to the absorption film of the cleaned and dried samplers, which were placed at definite sites for a sampling time of 3-5 d. At the end of sampling, the base films and absorption films were taken out and each set of the films were extracted ultrasonically for 10 min with 5.00 mL of water, and 4 anions of NO₂^-, NO₃^-, SO₃^2- and SO₄^2- in the extracts were determined by ion chromatography. IonPac AS18 chromatographic column was used for chromatographic separation, 25 mmol·L^-1 potassium hydroxide solution was used as mobile phase, and restraining conductance detector was used in the determination. The detection limits (3S/N) of the 4 anions found were 0.007 8, 0.008 9, 0.009 0, 0.008 0 mg·L^-1 respectively. Values of recovery found by standard addition method were in the range of 91.0%-103%. Values of RSD's (n=6) found were 2.5% (for NO₂^-), 22% (for NO₃^-), 21% (for SO₃^2-), 29% (for SO₄^2-).