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Measurement method for seawater total nitrogen content

A technology of nitrogen content and detection method, which is applied in the preparation of test samples, color/spectral characteristic measurement, etc., can solve the problems of large amount of sample usage, reagent usage, total nitrogen measurement error, and complicated steps, so as to save detection cost , reduce experimental errors, and the effect of simple measurement process

Inactive Publication Date: 2013-03-20
FISHERY MACHINERY & INSTR RES INST CHINESE ACADEMY OF FISHERY SCI
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Problems solved by technology

Since the above method involves two-step conversion, not only the steps are complicated and time-consuming (usually 6-8 hours), but also easily cause errors in the determination of total nitrogen due to material conversion.
Moreover, in the existing total nitrogen detection method, the amount of sample and reagent used is quite large, resulting in unnecessary waste

Method used

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  • Measurement method for seawater total nitrogen content
  • Measurement method for seawater total nitrogen content
  • Measurement method for seawater total nitrogen content

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Embodiment Construction

[0023] Below in conjunction with embodiment, the present invention will be further described:

[0024] Equipment used in the experiment: ALP autoclave CL-32L, Merk Millipore water purifier SheEA00003D, HACH UV spectrophotometer DR5000.

[0025] Reagents used in the experiment:

[0026] Sodium hydroxide solution: Weigh 20g of NaOH, dissolve in ammonia-free water, and dilute to 1000mL.

[0027] Alkaline potassium persulfate solution: take 40g potassium persulfate (K 2 S 2 o 8 ), 15gNaOH, dissolved in ammonia-free water, diluted to 1000mL.

[0028] (1+9) hydrochloric acid: hydrochloric acid with a mass concentration of 30%-37% and ammonia-free water are mixed according to a volume ratio of 1:9.

[0029] Potassium nitrate stock solution: weigh 0.7218g of high-grade pure KNO that has been dried at 105°C to 110°C for 4 hours 3 Dissolve in ammonia-free water, transfer to a 1000mL volumetric flask, add 2mL chloroform as a protective agent, and adjust the volume to 1000ml with am...

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Abstract

The invention belongs to the field of sea water quality standard measurement, and particularly relates to a measurement method for water total nitrogen content in seawater culture. Firstly, absorbance of standard liquid is measured, and the steps of measurement include that after the potassium nitrate standard liquid is diluted by means of diluents, alkaline potassium persulfate solutes are added for oxidation, the mixing liquid is heated and then cooled, digestion products are obtained, hydrochloric acid solutes are added into the digestion products, the digestion products are diluted by diluents after being dissolved, the absorbance is measured by means of an ultraviolet spectrophotometer, and a standard curve is drawn according to an adjusted value of the absorbance. Then a seawater sample is measured according to measurement steps of the absorbance of the standard liquid, the value of the absorbance is obtained, and eventually the total nitrogen content in the sample is calculated according to the standard curve. Compared with a measurement method for seawater in the prior art, the measurement method omits a middle conversion process, measurement steps are simple, convenient, quick and precise, and measurement time is 2.5 hours shorter than that of an existing measurement method. According to the measurement method, reagent variety is few, used amount of reagents is little, and measurement cost is saved.

Description

technical field [0001] The invention belongs to the field of measurement of marine water quality standards, in particular to a method for determining the total nitrogen content of water in mariculture. Background technique [0002] Mariculture is a production method that uses shallow seas, tidal flats, harbors, ponds and other sea areas to raise and reproduce marine economic animals and plants. It is one of the important ways for human beings to use marine biological resources and develop marine aquaculture. In mariculture, total nitrogen in seawater is one of the important indicators reflecting water quality, and total nitrogen refers to the amount of NH in water. 4 -N, NO 3 -N, NO 2 The general term for the sum of N and organic nitrogen. [0003] In mariculture, due to a large amount of exogenous bait and excrement, the N, P and organic matter in the water body increase greatly, leading to the deterioration of water quality, which has become one of the main factors rest...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/33G01N1/38
Inventor 时旭顾兆俊刘兴国
Owner FISHERY MACHINERY & INSTR RES INST CHINESE ACADEMY OF FISHERY SCI
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