毛细管柱气相色谱法同时测定水中甲醇、乙醇和N,N-二甲基甲酰胺

采用HP-PLOT Q毛细管柱,气相色谱氢火焰离子化检测器同时测定地表水和废水中甲醇,乙醇,N,N-二甲基甲酰胺,方法不受水中苯系物的干扰,在甲醇,乙醇,N,N-二甲基甲酰胺分别为7.92~792 mg/L,7.98~798 mg/L和9.45~945 mg/L范围内线性良好,相关系数均0.999,准确度高,加标回收率均94.2%,精密度好,相对标准偏差均≤5.79%,检出限分别为1.17,1.31和2.05 mg/L。

Simultanious Determination of Methanol,Ethanol, N,N-dimethyl Formamide in Water by Capillary Gas Chromatographic Method

A capillary gas chromatographic method had been developed for simultanious determination of methanol, ethanol, N,N-dimethylformamide( DMF) in surface water and waste water. An HP-PLOT Q column was employed. Quantitative analysis was car-ried out by means of hydrogen flame ionization detector ( FID) . The results indicated that the coexistence of BTEX had no interfer-ence with the test. Methanol, ethanol and DMF showed good linearity when concentration ranged from 7. 92 to 792 mg/L, 7. 98 to 798 mg/L and 9. 45 to 945 mg/L, respectively, with the correlation coefficients larger than 0. 999. The average recoveries were greater than 94. 2% and the relative standard deviations( RSDs) come to be less than 5. 79%, which showed high accuracy and good precision The method detection limits for the three compounds were 1. 17, 1. 31 and 2. 05 mg/L, respectively.