Sewage sampling method: 1. Sewage monitoring items have different requirements according to industry types. When collecting samples in time units, measure pH, COD, BOD
5, DO, sulfide, oil, organic matter, residual chlorine, fecal coliform, suspended Samples of objects, radioactivity and other items cannot be mixed and can only be sampled separately. 2. Requirements for different monitoring items For different monitoring items, the material of the container to be selected, the preservative added and its dosage and storage period, the volume of the water sample to be collected, the container and its washing method, etc. 3. Automatic sampling Automatic sampling is carried out with an automatic sampler, and there are time proportional sampling and flow proportional sampling. When the amount of sewage discharge is relatively stable, time proportional sampling can be adopted; otherwise, flow proportional sampling must be adopted. The automatic sampler used must meet the technical requirements for sewage samplers promulgated by the State Environmental Protection Administration. 4. Setting of the actual sampling position The actual sampling position should be in the center of the sampling section. When the water depth is greater than 1m, it should be sampled at the depth of 1/4 below the surface; when the water depth is less than or equal to 1m, it should be sampled at 1/2 of the water depth. Precautions for sewage sampling: 1. When sampling directly with the sample container, it must be washed with water three times before sampling. But when there is oil slick on the water surface, the container of oil production cannot be washed. 2. When sampling, care should be taken to remove sundries, garbage and other floating objects on the water surface. 3. Water samples used to determine suspended solids, BOD5, sulfide, oil, and residual chlorine must be sampled separately at a constant volume, and all of them are used for determination. 4. When selecting a special sampler (such as an oil sampler), take samples according to the usage method of the sampler. 5. When sampling, the 'Sewage Sampling Record Form' should be filled in carefully. The table should contain the following contents: name of pollution source, monitoring purpose, monitoring item, sampling point, sampling time, sample number, sewage property, sewage flow, sampling person's name and Other related matters, etc. The specific format can be formulated by each province. 6. All projects that require on-site monitoring should be carried out on-site monitoring. Additional considerations can be found in the sampling section for surface water quality monitoring.
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