With the update of environmental standards for pollution sources, some areas (Jiangsu, Jiangxi) according to their own characteristics of the need to save water samples for a longer period of time, put forward the DR water quality autosampler sample bottles to automatically add the preservative requirements, the pollution sources to measure the parameters of the chemical oxygen demand (CODCr), ammonia and nitrogen (NH3-N), total phosphorus (TP), total nitrogen (TN), adding the preservative agent for the addition of concentrated H2SO4, the amount of addition is generally 0.8ml per L of water samples, so that the water samples acidified pH value between 1 and 2. According to HJ493-2009 "Water Quality Sample Preservation and Management Technical Regulations", after adding preservative, the effective preservation time of chemical oxygen demand (CODCr) is 2 days, ammonia nitrogen (NH3-N) is 24 hours, total phosphorus (TP) is 24 hours, total nitrogen (TN) is 7 days. In the actual work site, due to sewage treatment plants, sewage enterprises wastewater samples have been treated in depth, there is no volatile, easy to dissipate substances, the monitored factor values are stable, the change is minimal. It is generally recommended that the test be completed within 2 days when no fixative is added, and within 5 days after the preservative is added!
803N water quality autosampler can realize the collection of mixed water samples, mixing and temporary storage of mixed water samples, exceeding the limit of the sample and alarm, refrigerated samples, automatic cleaning and emptying of the mixing barrel function, when according to their own needs to automatically add a fixative, to extend the sample preservation time, to protect the samples of the needs. At the same time can also be given to meet the HJ35X-2019 series of standards, is an indispensable supporting equipment in the overall solution of the water pollution source online monitoring system!