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Method for determining ammonia nitrogen content in seawater by Nessler's reagent spectrophotometry

A spectrophotometry, Nessler's reagent technology, applied in the direction of color/spectral property measurement, measuring device, general water supply saving, etc., can solve the problems of unstable effect, poor control of dosage, poor applicability, etc., to achieve results. Stable and reliable, reduced dosage and wide application range

Active Publication Date: 2022-01-11
HAINAN UNIVERSITY
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Problems solved by technology

Although many domestic literatures have improved this method in order to use the Nessler reagent method to determine ammonia nitrogen in seawater samples, we found in the actual operation process that these improved methods are not very applicable, and most methods use the addition of hydrogen Sodium oxide solution is used as an aid, its dosage is not easy to control, the operation is extremely difficult, and the effect is not stable

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  • Method for determining ammonia nitrogen content in seawater by Nessler's reagent spectrophotometry
  • Method for determining ammonia nitrogen content in seawater by Nessler's reagent spectrophotometry
  • Method for determining ammonia nitrogen content in seawater by Nessler's reagent spectrophotometry

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Embodiment 1

[0075] Determination of ammonia nitrogen content in artificial seawater samples of different salinities.

[0076] 1. Solution preparation

[0077] Preparation of artificial seawater: Weigh 35.0g of sea salt and dissolve in 1000mL of ammonia-free water.

[0078] Preparation of artificial seawater with different salinities: prepared by diluting with ammonia-free water in proportion.

[0079] Sample 1: 35.0ppt ammonia-free seawater, containing 0.5mg / L ammonia nitrogen.

[0080] Sample 2: 35.0ppt ammonia-free seawater, containing 3.0mg / L ammonia nitrogen.

[0081] Sample 3: 35.0ppt ammonia-free seawater, containing 6.0mg / L ammonia nitrogen.

[0082] Sample 4: 32.74ppt ammonia-free seawater, containing 0.5mg / L ammonia nitrogen.

[0083] Sample 5: 32.74ppt ammonia-free seawater, containing 3.0mg / L ammonia nitrogen.

[0084] Sample 6: 32.74ppt ammonia-free seawater, containing 6.0mg / L ammonia nitrogen.

[0085] Sample 7: 17.83ppt ammonia-free seawater, containing 5.0mg / L ammoni...

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Abstract

The invention provides a method for determining ammonia nitrogen content in seawater by Nessler's reagent spectrophotometry. According to the method, the optimal addition amount of sodium potassium tartrate in a wide salinity range is found out by adjusting the concentration and volume of sodium potassium tartrate according to the salinity of a sample to be detected, that is, the interference of impurity ions such as Ca 2+, Mg 2+, Fe 2+ and Mn 2+ in the seawater sample can be eliminated only by using a sodium potassium tartrate solution as a masking agent, so that the Nessler reagent in the seawater is more stable in color development, and the method is wider in application range. According to the method, reagents such as sodium hydroxide are not needed as masking assistance, and the dosages of the potassium sodium tartrate and the Nessler reagent are less, so that the environmental pollution is reduced, and the cost is saved; besides, the method has the advantages of less interference, simplicity in operation, high speed, high recovery rate, good precision and the like.

Description

technical field [0001] The invention relates to the technical field of environmental detection and analysis, in particular to a Nessler reagent spectrophotometric method for determining ammonia nitrogen content in seawater. [0002] technical background [0003] The method for determining ammonia nitrogen in seawater is the sodium hypobromite oxidation method commonly used. The principle of the method is that the hypobromite oxidizes ammonia nitrogen to nitrite in an alkaline medium, and then measures the nitrite by diazo-azo spectrophotometry. The total amount of nitrate nitrogen is subtracted from the original nitrite content in the sample to obtain the concentration of nitrogen and ammonia. This method has higher requirements on reaction conditions, longer test time, and the quality of reagents has a great influence on the test. The method is not easy to master, the test error is large, and the reproducibility is poor. It is not suitable for heavy pollution and high organi...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31G01N1/38
CPCG01N21/3103G01N1/38Y02A20/20
Inventor 杨飞黄春慧文畅宋青青潘国英黄薇薇姚雪梅周梅阳
Owner HAINAN UNIVERSITY
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