Determination of metal content in the air with a tearable strip-shaped three-layer filter membrane strip and manufacturing method

Abstract

The invention discloses a tear-off band-shaped three-layer filter membrane strip for determining the content of metals in air, and a making method thereof, and belongs to the field of laboratory consumable products. The tear-off band-shaped three-layer filter membrane strip comprises a supporting shaft, a metal spraying filter membrane is positioned between an upper filter membrane protection paper and a lower filter membrane protection paper, the metal spraying filter membrane, the upper filter membrane protection and the lower filter membrane protection paper are extension band-shaped structures respectively, two edges of the above three extension bands are glued form one body, or the three extension bands are crimped through a viscose glue integral crimping technology to form one body; and the upper membrane filter paper, the metal spraying filter membrane and the lower filter membrane filter paper are wound with the supporting shaft as an axle to form rolls. One side of the metal spraying filter membrane clinging to the upper filter membrane protection paper is sprayed with a metal salt solution in a pressurized manner through a fixed-point pressurizing uniform mist spraying process, the metal spraying filter membrane and the lower filter membrane filter protection paper uniformly pass by below a fixed-point pressurizing mist nozzle at a same speed, fast drying is carried out after spraying, the upper filter membrane protection paper is covered and then is pressurized for stitching, equidistant breakpoint lines are realized through a laser breaking machine, and rolling and packaging are carried out. The tear-off band-shaped three-layer filter membrane strip has the advantages of simple process, good effect, low cost and very broad application prospect.

Description

technical field [0001] The invention belongs to the field of laboratory consumables, and in particular relates to a tearable band-shaped quantitative metal three-layer filter membrane for measuring the metal content in the air and a manufacturing method thereof. Background technique [0002] At this stage, at present, the method of collecting metals in the ambient atmosphere is mainly to filter a certain volume of air samples, and trap the particulate and aerosol metals in the air in the microporous filter membrane. Atomic absorption spectrophotometry is often used for sample determination, which requires digestion of the filter membrane in the experimental pretreatment stage and transfer of metals to the solution for determination. [0003] In the detection of metal content in the filter membrane, the commonly used quantitative method is the standard curve method. The method uses directly prepared metal solutions of different concentrations as each point of the standard cur...

AI Technical Summary

Problems solved by technology

The standard curve method can only deduct the deviation of the standard curve in terms of intercept to a certain extent, and cannot deal with the influence of the above effects on the slope of the standard curve. There are limitations, resulting in the inability to obtain correct measurement results during actual measurement.

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