《环境监测报告》魔法香蕉nanb

3、3.On-site sampling procedures and equipment, sample processing

　　The purpose of sampling is to collect a portion of material that is minor enough to be easily transported and processed in a laboratory, while being representative and still representative of the characteristics of the site being sampled. Errors that occur during sampling cannot be corrected by laboratory or statistics. Therefore, the correct sampling method is essential to obtain reliable test results.
　　On-site sampling plans will be considered for weekly periodic monitoring to identify water contamination and a random sampling method. The sampling points in the slow-flow area, the inlet area, the outlet area and the connecting area of Furong Lake were sampled separately.

　　Sampling equipment includes samplers, standing containers, vials, water sample preservatives, and other required auxiliary equipment. The material and structure of sampling equipment, water sample storage, and container washing methods should meet the requirements of standard analysis methods. If a new container is used, it should be thoroughly cleaned beforehand. The sampler\'s selection surface sampler can meet the sampling needs.

　　Sampling method: Select the appropriate tonnage vessel according to the sampling time and wind and wave level; The sampling vessel should be located downstream of the sampling point and collect water samples countercurrent to avoid agitation of the bottom sediment and cause water sample pollution. The sampler should take a water sample at the front of the vessel and keep the sampler as far away from the hull as possible. If the vessel is not ready to stand, it should be left to rest immediately upon returning to shore.

　　In the storage and transportation of samples, the water sample should be filled into the container to overflow and sealed during sampling to reduce the reaction interference with oxygen and carbon dioxide in the air and the oscillation interference during sample transportation. From the collection of samples to the transportation to the laboratory, refrigerate at 1~5 °C and store in a dark place. Water samples must be sent back to the lab immediately after collection, with appropriate transportation based on the geographic location of the sampling site and the maximum storage time before analysis for each item. When packing, styrofoam and other partitions should be applied to prevent breakage. Each water sample bottle should be labeled, including the sampling point number, the date and time of sampling, the measurement item, the storage method, and the description of what preservation agent is used.