论文部分内容阅读
特4cm×0．3mm内征的牙科5号针头的内表面（针头和针管的连接部分除外）用OV－1气相色谱固定液涂敷，膜厚4．8μm。此外头配用2mL注射针管作为固相微萃取器对模拟水样中的三氯甲烷和四氯化碳进行了萃取研究。考察了取样方式、解吸方式、解吸时间、解吸温度等条件对结果的影响。实验表明，这种萃取装置和气相色谱仪配合，仅用1mL样品，即可使水中三氯甲烷和四氯化碳的检出限达到0．5μg／L和0．05μg/L，线性范围102，相关系数分别为0．983和0．979，相对标准偏差分别为7．3％和7．7％。
The inner surface of the Dental No.5 needle (except for the connection between the needle and the needle tube) of the 4 cm × 0.3 mm special tooth was coated with OV-1 gas chromatographic fixing solution and the film thickness was 4.8 μm. In addition head with 2mL syringe needle as a solid-phase microextractor simulated water samples of chloroform and carbon tetrachloride extraction study. The effects of sampling methods, desorption method, desorption time and desorption temperature on the results were investigated. Experiments show that the extraction device and the gas chromatograph with only 1mL sample, you can make the detection limit of chloroform and carbon tetrachloride 0.5μg / L and 0.05μg / L, the linear range of 102 , The correlation coefficients were 0.983 and 0.979 respectively, with relative standard deviations of 7.3% and 7.7% respectively.