Device and method for on-line detection of content of ammonia nitrogen in seawater

Abstract

The invention discloses a device and a method for on-line detection of the content of ammonia nitrogen in seawater, and aims to detect the content of ammonia nitrogen of a seawater solution on the basis of a fluorescent spectrophotometer method. The device comprises a first three-way electromagnetic valve, a second three-way electromagnetic valve, a peristaltic pump, a mixing heating device, a fluorescent flowing cuvette, a light source, a light receiver and a signal processing system. With the combination of a flow injection technique and the fluorescent spectrophotometer method, the two three-way electromagnetic valves and the peristaltic pump are controlled to feed samples in sequence, on-line detection of the content of ammonia nitrogen in the seawater is achieved, and the device and the method are high in integration degree, simple to operate, single in mixed agent, short in reaction time and high in effectiveness. The mixing heating device is adopted to heat a seawater sample solution and an OPA mixed reagent which are pumped into a flowing channel, and the seawater sample solution and the OPA mixed reagent are sufficiently mixed in the heating process, so that mixing and heating are integrated, the reaction security is ensured while the size is reduced, and the accuracy of detection results can be improved.

Description

technical field [0001] The invention belongs to the technical field of seawater chemical analysis, and in particular relates to a detection device and a detection method for online detection of ammonia nitrogen content in seawater. Background technique [0002] Ammonia nitrogen inorganic nutrient salt is a kind of free ammonia (NH 3 ) and ammonium ions (NH 4 + ) in the form of nitrogen, generally with the symbol NH 4 + -N means that it mainly comes from the decomposition products of nitrogen-containing organic matter in domestic sewage under the action of microorganisms, industrial wastewater such as synthetic ammonia, and farmland drainage. Determination of ammonia nitrogen content in water quality is helpful to evaluate the status of water pollution and "self-purification". The traditional determination method of ammonia nitrogen content in water quality is Nessler's reagent photometric method, but because seawater contains a large amount of calcium and magnesium ions...

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Problems solved by technology

This method uses a single mixed reagent, the reagent is non-toxic and has good stability, but in the measurement process, it is necessary to artificially mix the seawater to be tested and the o-phthalaldehyde (OPA) reagent in the laboratory for a period of time before using the instrument for fluorescence. Therefore, the degree of automation is low, the operation is relatively complicated, and the effectiveness is poor. It is impossible to achieve online determination of the ammonia nitrogen content in seawater.

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