采用前置取样系统-高效液相色谱-电感耦合等离子体质谱法快速测定进口天然气中4种形态砷的含量。样品采用pH 4.3的10mmol·L~(-1)庚烷磺酸钠-10mmol·L~(-1)柠檬酸溶液吸收装置进行前处理,以Hypersil GOLD aQ色谱柱为分离柱,以上述pH 4.3的吸收剂混合溶液为流动相,采用电感耦合等离子体质谱法进行测定。4种形态砷的线性范围均为0.20~5.00μg·L~(-1),方法的检出限(3S/N)为0.044~0.066μg·L~(-1)。加标回收率为81.4%~97.4%,测定值的相对标准偏差(n=6)为3.2%~4.9%。 Rapid Determination of Four Forms of Arsenic in Imported Natural Gas by High Performance Liquid Chromatography - Inductively Coupled Plasma Mass Spectrometry with a Sampling System. The samples were pre-treated with 10 mmol·L -1 heptane sulfonate-10 mmol·L -1 citric acid solution with pH 4.3. The separation was performed on a Hypersil GOLD aQ column with the above pH 4.3 Of the absorbent mixed solution as the mobile phase, determined by inductively coupled plasma mass spectrometry. The linear range of the four forms of arsenic was 0.20-5.00 μg · L -1, and the detection limit (3S / N) of the four forms was 0.044-0.066 μg · L -1. The spiked recoveries ranged from 81.4% to 97.4%, with relative standard deviations (n ​​= 6) of 3.2% to 4.9%.