吸收液采样-气相色谱法测定空气和废气中9种卤乙酸

GC Determination of 9 Haloacetic Acids in Air and Exhaust Gas with Absorption Liquid Sampling

摘要: 以40 mL的0.1 mol·L^-1氢氧化钠溶液为吸收液，吸收采集空气或废气中9种卤乙酸，采气流量为0.5 L·min^-1，采集时间为40 min，采用气相色谱法测定吸收液中9种卤乙酸的含量，用DB-1701毛细管色谱柱分离，电子捕获检测器测定。以1，2，3-三氯丙烷为内标，9种卤乙酸的线性范围均为3.0~400.0 μg·m^-3，检出限（3S/N）为0.35~2.03 μg·m^-3。加标回收率为73.7%~117%，测定值的相对标准偏差（n=6）为3.4%~8.4%。

Abstract: 0.1 mol·L^-1 sodium hydroxide solution (40 mL)was used as absorption liquid to absorb and collect 9 haloacetic acids in air or exhaust gas. The gas flow rate was 0.5 L·min^-1 and the collection time was 40 min. GC was applied to the determination of 9 haloacetic acids in absorption liquid. The analytes were separated on DB-1701 capillary chromatographic column and detected by ECD. 1,2,3-Trichloropropane was used as internal standard. Linearity ranges of the 9 haloacetic acids were found in the same range of 3.0-400.0 μg·m^-3 with detection limits (3S/N) in the range of 0.35-2.03 μg·m^-3. Values of recovery found by standard addition method were in the range of 73.7%-117%, and values of RSDs (n=6) of determined values were in the range of 3.4%-8.4%.