Instrument for measuring nitrate nitrogen in water on line

Abstract

The invention provides an instrument for measuring nitrate nitrogen in water on line and belongs to the technical field of water quality monitoring instruments and equipment. The technical scheme is that: the instrument consists of an outer shell, a detection pool, a light source, a detection part and a control circuit, wherein the detection pool is arranged on the middle part of the outer shell;the detection pool is divided into two parts, namely an upper part and a lower part; the light source is arranged inside an upper outer shell on one side of the upper detection pool; the detection part and the control circuit are arranged inside a lower outer shell on one side of the lower detection pool; water feeding grooves are formed on opposite end faces of the lower detection pool and the upper detection pool; a corresponding light-transmitting hole is formed along the axial line of the detection pool; a quartz lens is arranged on the light-transmitting hole; and the detection part is arranged at a position corresponding to the axial line of the light-transmitting hole. By a double-wavelength ultraviolet absorption method, a waterproof design is realized, and the instrument can be thrown into water and performs in-situ detection on a water body; secondary pollution to the environment is avoided; the concentration of the nitrate nitrogen in water can be quickly, efficiently and accurately measured on line; and the home and abroad blank is filled.

Description

technical field [0001] The invention relates to an instrument for detecting the concentration of nitrate nitrogen in drinking water, underground water, surface water and sewage, and belongs to the technical field of water quality monitoring instruments and equipment. Background technique [0002] Nitrate nitrogen is the final decomposition product of nitrogen-containing organic compounds through mineralization. Nitrate nitrogen itself is not poisonous to the human body, but it is reduced to nitrite nitrogen after the action of nitrate-reducing bacteria in the human body, and its toxicity is expanded to 11 times that of nitrate. Nitrite can convert hemoglobin into methemoglobin or nitrohemoglobin, so that the red blood cells will no longer have the ability to carry oxygen, and the human body will suffocate. Various national standards, such as GB / T 14848-9 "Groundwater Quality Standards", GB 5749-2006 "Drinking Water Hygienic Standards", and GB 3838-2002 "Surface Water Enviro...

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Problems solved by technology

Among them, the phenol disulfonic acid method and the cadmium column reduction method have strict requirements on reaction conditions, complex operation, complicated and time-consuming pretreatment due to many interference factors, and unstable recovery rate of standard addition; the ion-selective electrode method is simple to operate, but the operation cost is high, which brings secondary problems. Secondary pollution; the measurement range of UV spectrometry is small, and the pretreatment is complicated

However, some other types of instruments for detecting nitrate nitrogen in foreign countries have problems such as specific settings not suitable for my country's national conditions, difficult instrument maintenance, high price, and inconvenient transportation. Therefore, it is necessary to independently develop an instrument that can meet the needs of online monitoring nitrate nitrogen. very necessary

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