1, sampling items required for sampling preparation, sampling items required for sampling preparation (on-site collection information record form (indoor air), pen, label paper, filter cartridge, filter membrane, absorbent, sampling box) and other related items. When collecting pollution sources, the site description records and working condition description records of pollution source monitoring should be prepared and filled in completely.

2. Sampling personnel are generally composed of two people, and have received the sampling task (entrustment form). Newcomers should do a good job of pre-sampling, prepare the relevant equipment and instruments of the project, fill in the use record of outgoing equipment completely, and check whether the items in the instrument accessory box used in the project are complete.

3. Precautions: Do not stir the sediment at the bottom of the water when sampling. Do not wash the sampling bottle (device) with water sample when collecting water sample for oil determination. At the same time, a columnar water sample was collected from the water surface to 300mm below the water surface, and the water sample was put into a sampling bottle for determination.

4. When collecting and measuring dissolved oxygen, biochemical oxygen demand and organic matter water samples, the water samples should be put into containers, with no gap at the upper part, and water seals should be adopted.

5, water samples contain precipitable solids (such as sediment, etc.). ), the sediment should be removed separately. The separation method is as follows: shake the collected water sample evenly, pour it into a cylindrical glass container (such as a measuring cylinder), let it stand for 30 minutes, move the water sample containing suspended solids but not precipitated solids into the sampling container, and add preservatives. Except for water samples used to determine total suspended solids and oil.