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

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

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。

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 carried out by means of hydrogen flame ionization detector（ FID）. The results indicated that the coexistence of BTEX had no interference 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.