挥发性有机物在线监测系统在饮用水源地水体监测中的应用

Application of Volatile Organic Compounds Online Monitoring System in Water Body Monitoring of Drinking Water Sources

水中挥发性有机物(VOCs)在线监测系统,实现了超声雾化法气液分离,并结合冷阱捕集解析技术,利用气相色谱质谱法监测水中VOCs。该法在25种VOCs质量浓度0.5~20μg/L范围内线性良好,线性相关系数均>0.990,检出限为0.10~0.51μg/L,测定下限为0.40~2.04μg/L。通过与实验室法的比对,说明该法可达实验室监测仪器同等水平。

The set of volatile organic compounds(VOCs)online monitoring system realized the separation of the gas-liquid by ultrasonic nebulization and used the combination of the cold trap technique was used for analysis of the VOCs in water by gas chromatography-mass spectrometry.The calibration curve of 25 VOCs were liner in the range of 0.5~20μg/L with correlation coefficients more than 0.990.The limits of detection and quantitation were in the range of 0.10~0.51 and 0.40~2.04μg/L.Through the laboratory test comparison,the method was proved to achieve the same level of laboratory monitoring instruments.