General provisions on sampling methods for surface water and sewage?

1, sewage monitoring projects are different according to industry types. Samples used to determine pH, COD, BOD5, DO, sulfide, oil, organic matter, residual chlorine, fecal coliform, suspended matter, radioactivity and other items when collecting samples in different time units. Can't mix, only separate sampling.

2. According to different monitoring items, the material of the container, the added preservative and its dosage and shelf life, the volume of water samples collected and the cleaning method of the container should be selected.

3. Automatic sampling Automatic sampling is carried out with an automatic sampler, including time proportional sampling and flow proportional sampling. Time proportional sampling can be used when sewage discharge is stable, otherwise flow proportional sampling must be used. The automatic sampler used must meet the Technical Requirements for Sewage Samplers issued by the State Environmental Protection Administration (to be determined).

4, the actual sampling position should be in the center of the sampling section. When the water depth is greater than 1m, samples shall be taken at 1/4 below the water surface; When the water depth is less than or equal to 1m, sample at 1/2 of the water depth.

5. Precautions A. When sampling directly with a sample container, it must be washed with water sample for three times before sampling. However, when there is oil slick on the water surface, the oil production container cannot be cleaned.

B, sampling should pay attention to remove debris, garbage and other floating objects on the water.

C, used for the determination of suspended solids, BOD5, sulfide, oil, residual chlorine water samples, must be a separate constant volume sampling, all used for determination.

D, when choosing a special special sampler (such as oil sampler), sampling should be done according to the purpose of the sampler.

E. When sampling, the Sewage Sampling Record Form should be carefully filled in, such as: name of pollution source, monitoring purpose, monitoring items, sampling location, sampling time, sampling number, sewage nature, sewage flow direction, name of sampler and other related matters. The specific format can be formulated by the provinces themselves.

F, where the need for on-site monitoring of the project, should be on-site monitoring. See the sampling section of surface water quality monitoring for other precautions.

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