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用气相色谱法测定车间空气中的乙醚,具有方法简便、灵敏度高,分析速度快等优点,其最低检出量为2×10~(-10)g,目前国家卫生标准规定车间空气中乙醚的最高容许浓度为500mg/m~3,故本法能满足测定车间空气中乙醚浓度的要求。 (一)仪器和操作条件 1.仪器:上分100型气相色谱仪。 2.色谱柱:长2m,内径4mm不锈钢柱,内装5％DNP+5％有机皂土+上试白色酸洗101担体,60～80目。柱温:100℃;检测器温度:150℃;氮气流量:45ml/min;空气流量:350ml/min;氢气流量:55ml/min。 (二)样品分析及计算
The determination of diethyl ether in the air of the workshop by gas chromatography has the advantages of simple method, high sensitivity and fast analysis speed, and the minimum detectable quantity is 2 × 10 -10 g. At present, the national health standard stipulates that the ether The maximum allowable concentration of 500mg / m ~ 3, so this method can meet the determination of the concentration of ether in the air workshop requirements. (A) instruments and operating conditions 1. Instruments: on the sub-100 gas chromatograph. 2. Column: 2m long, 4mm inner diameter stainless steel column, containing 5% DNP + 5% organic bentonite + on white pickling 101 carrier, 60 ~ 80 mesh. Column temperature: 100C; detector temperature: 150C; nitrogen flow rate: 45 ml / min; air flow rate: 350 ml / min; hydrogen flow rate: 55 ml / min. (B) sample analysis and calculation