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本文采样时选用石油醚作为吸收液,用冰-盐使吸收液温度控制在-2℃以下,以便使采样保持在低温下进行。采样后直接用紫外分光光度法进行测定,从而消除了由于提取剂用量及提取次数所引起的误差。所拟定的大气及车间环境中油雾的采样及含量测定方法应用于实际分析。标准加料回收率为98-99%。方法具有灵敏度高、简便、快速的特点。仪器与试剂:油标准液:准确称取1.000g标准油样,用石油醚稀释至1000mL,使其为1mg/mL油的储备液;石油醚:60-90℃时透过率大于80%。大气采样真空泵,30L/min;标准流量计,0-1.5L/min;限流孔流量,0.5L/min;U型小型多
In this paper, petroleum ether was selected as the absorbing liquid, and the temperature of absorption liquid was controlled below -2 ℃ with ice-salt, so that the sampling was kept at low temperature. After the sample was measured directly by UV spectrophotometry, thus eliminating the amount of extractant due to the error caused by the number of extraction. The proposed method for sampling and measuring oil mist in the atmosphere and workshop environment is applied to the actual analysis. Standard feed recovery rate of 98-99%. The method has the characteristics of high sensitivity, simplicity and speed. Instruments and reagents: oil standard solution: accurately weighed 1.000g standard oil samples, diluted with petroleum ether to 1000mL, make it a stock solution of 1mg / mL oil; petroleum ether: 60-90 ℃ when the transmittance is greater than 80%. Atmospheric sampling vacuum pump, 30L / min; Standard flowmeter, 0-1.5L / min; Flow limiting orifice, 0.5L / min;