A kind of gas flow type quantitative concentration sampling device and method
A technology of quantitative concentration and sample injection device, which is applied in the field of pretreatment, can solve the problems that the concentration multiple cannot meet the detection requirements of trace substances, the concentration technology takes a long time, and the operation is complicated, so as to avoid the harm caused by operators and the environment and save The effect of reducing the amount of solvent used and the amount of organic solvent used
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[0024] As shown in Figures 1 to 2, an airflow type quantitative concentration sampling device provided by the present invention includes a syringe 2, a piston 1 inside the syringe 2 and a needle 3 on the syringe 2, and the piston 1 is provided with a needle handle. 9. The syringe 2 is provided with an upper hollow cylinder 6 and a lower hollow cylinder 7, the diameter of the lower hollow cylinder 7 is smaller than that of the upper hollow cylinder 6, the upper hollow cylinder 6 and the lower hollow cylinder 7 are connected to each other, and the lower hollow cylinder 7 and the needle head 3 are connected with each other, and the end of the lower hollow cylinder 7 close to the needle head 3 is provided with a variable diameter 8, the lower end of the piston 1 is set in the lower hollow cylinder 7, and the upper hollow cylinder 6 is provided with a measuring range of The upper scale line 4 of 1 mL; the lower scale line 5 with a volume range of 2 μL is set on the lower hollow cyli...
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