为改善直接进样法中高浓度盐对进样口、色谱柱和检测器的污染,降低检出限。

　　浩瀚色谱（山东）应用技术开发有限公司建立了顶空气相色谱法测定空气和废气中乙醛的方法,并对色谱条件和顶空进样条件进行了优化。结果:该方法的检出限1.0μg,当采样体积为100 L时,方法检出浓度为0.01 mg/m3,室内相对标准偏差为1.6%~5.0%,加标回收率为95.2%~101.0%。结论:该方法有效地避免了直接进样法中高浓度盐对进样口、色谱柱乃至检测器的污染,并且大大降低了检出限,方法的可靠性和可操作性令人满意。

　　HJ/T 35-1999 固定污染源排气中乙醛的测定 气相色谱法

　　HJ/T 35-1999 固定污染源排气中乙醛的测定 气相色谱法

　　本标准适用于固定污染源有组织排放和无组织排放的乙醛测定。

　　名称:不锈钢填充柱

　　规格:2m*3mm

　　型号:20%PEG-20M/GCS880 AW DMCS

　　编号:20240812006

　　*高温度:240°C

　　To improve the contamination of the injection port, chromatographic column, and detector by high concentration salts in direct injection method and reduce the detection limit.

　　Haohan Chromatography (Shandong) Application Technology Development Co., Ltd. has established a headspace gas chromatography method for the determination of acetaldehyde in air and exhaust gas, and optimized the chromatographic conditions and headspace injection conditions. Result: The detection limit of this method is 1.0 μ g. When the sampling volume is 100 L, the detected concentration of the method is 0.01 mg/m3, the indoor relative standard deviation is 1.6%~5.0%, and the spiked recovery rate is 95.2%~101.0%. Conclusion: This method effectively avoids contamination of the injection port, chromatographic column, and even detector by high concentration salts in direct injection method, and greatly reduces the detection limit. The reliability and operability of the method are satisfactory.

　　HJ/T 35-1999 Determination of Acetaldehyde in Exhaust Gas from Fixed Pollution Sources Gas Chromatography Method

　　HJ/T 35-1999 Determination of Acetaldehyde in Exhaust Gas from Fixed Pollution Sources Gas Chromatography Method

　　This standard is applicable to the determination of acetaldehyde in organized and unorganized emissions from fixed pollution sources.

　　Name: Stainless Steel Filled Column

　　Specification: 2m * 3mm

　　Model: 20% PEG-20M/GCS880 AW DMCS

　　Number: 20240812006

　　*High temperature: 240 ° C