On-site multi-spot water-sample sampling device and COD (chemical oxygen demand) content detection method

[0002] When evaluating water pollution, chemical oxygen demand (COD) is an important indicator to measure the degree of organic pollution in water. Many related studies have shown that when the concentration of COD in water exceeds a certain limit, it will affect water quality. and the growth of aquatic products will cause negative impacts, and will increase the cost of water treatment. Therefore, it is of great practical significance to quickly detect the COD concentration in water.

Traditional COD determination methods include potassium dichromate titration and rapid digestion spectrophotometry, etc. New methods such as electrochemical methods and flow injection analysis are also used for COD measuremen...

Lifting water pump 303 and water storage tank 301 are fixedly installed inside the housing, for ease of control, described lifting water pump 303 comprises rising water pump and descending water pump, and the water outlet of rising water pump communicates with the water outlet hole that is arranged on the bottom of the housing, The water inlet is communicated with the water storage tank 301; the water outlet of the descending water pump is communicated with the water storage tank 301, and the water inlet is communicated with the water inlet hole arranged on the top of the housing. When the submarine type electric drive device needs to rise like this, only need to start the ascending water pump, the ascending water pump pumps out water from the water storage tank 301 and discharges to the outside of the housing, the buoyancy of the device is greater than gravity, and the submarine type electric drive device rises. When needing to descend, then start the descending water pump, and the descending water pump pumps water from the external water source to the water storage tank 301 inside the housing, the buoyancy of the device is less than gravity, and the submarine type electric drive device rises. Because the internal space of the whole housing is small, in order to ensure that the asc...