Guidelines for Sampling to Determine Cotton Dust Concentration in the Workplace

16:20, 10/07/2024

This is an important content stipulated in Circular 02/2019/TT-BYT issuing the national technical regulation on dust - Permissible exposure limits for 05 dust elements in the workplace.

To ensure the accurate determination of cotton dust concentration in the workplace, sampling is crucial. To be specific: Circular 02/2019/TT-BYT provides the following sampling guidelines:

- Clean the exterior of the motor, sieving plate, and valve membrane thoroughly.- Install the vertical sieve set at the selected sampling position with an input height of 1.5-1.8 m above the workshop floor.- Remove the top part of the cassette.- Insert the cassette into the gasket ring of the sieve set, ensuring a depth of 2.54 cm into the gasket ring for a secure fit.- Remove the bottom plug of the cassette and connect it to a limit-hole containing conduit.- Operate the sieve set's pump and check that the vacuum pressure maintains at 14 inchHg.- Record the start time, cassette number, and sampler number.- Upon completion of the sampling period, turn off the pump and note the time.- Control sample: For each batch of filter paper, retain 2 additional samples as control samples. These control samples are transported to the field but not used for sampling.

Refer to the relevant regulations in Circular 02/2019/TT-BYT which is effective from September 22, 2019.

- Thanh Lam -

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