色谱大剂量直接进样分析水中微量烃

Analysis of trace alkanes in water by direct injecting of large amounts of sample

在气相色谱上进行大剂量水样 (10～ 10 0 μL)的直接进样来分析水中的烷烃 ,发现选择合适的固定相和较低的柱温时 ,样品的色谱峰可以不受水峰干扰。己烷的最小检出量为 0 .15mg/L ,相对标准偏差为 6.4%。用外标法测定了室温下水中烷烃的溶解度数据 ,与文献值接近。

Under suitable conditions of gas chromatographic technique,trace alkanes in water can be determined by direct injection of large amounts of sam ple without interference of water peak. The minimum detected level is about 0.15 mg/L and the relative standard deviation is 6.4% for hexane. The solubilities of four paraffinic hydrocarbons in water were determined experimentally at 25 ℃. Resul ts are close to the data reported.