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Method for analyzing and detecting trace ammonia nitrogen in complicated matrix by combining fast distillation method with ion chromatography technology

An ion chromatography and technical analysis technology, which is used in the field of rapid distillation combined with ion chromatography to analyze and detect trace ammonia nitrogen in complex matrices, to achieve the effects of high sensitivity, widening application scope and improving sensitivity

Inactive Publication Date: 2014-08-20
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the analysis and detection of ammonia nitrogen content by rapid distillation combined with ion chromatography has not been reported yet.

Method used

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  • Method for analyzing and detecting trace ammonia nitrogen in complicated matrix by combining fast distillation method with ion chromatography technology
  • Method for analyzing and detecting trace ammonia nitrogen in complicated matrix by combining fast distillation method with ion chromatography technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Separation and Analysis of Trace Ammonium Ions in Seawater of Sanmen Bay

[0032] Specific steps are as follows:

[0033] 1. Prepare simulated seawater samples: According to the content of each ion component in seawater, weigh a certain amount of corresponding analytical reagents (NaCl, KCl, NaCl, 2 SO 4 , CaCl 2 , NH 4 Cl, etc.) to prepare seawater simulation liquid.

[0034] 2. Sample pretreatment: The simulated seawater sample is subjected to rapid distillation with a rapid distillation pretreatment device. Through condition optimization experiment, the optimal distillation time is 15min.

[0035] 3. Selection of eluent: test different eluent ratios, and finally determine that it is 27mmol·L-1MSA (methanesulfonic acid), which can make the ammonium ion peak out quickly.

[0036]4. Separation and detection of ammonia nitrogen in actual complex matrix samples: According to the obtained optimized conditions, the actual complex matrix samples (Sanmen Bay seawater) w...

Embodiment 2

[0039] Separation and Analysis of Trace Ammonium Ions in Qiandao Lake Water

[0040] Specific steps are as follows:

[0041] 1. Prepare simulated seawater samples: According to the content of each ion component in seawater, weigh a certain amount of corresponding analytical reagents (NaCl, KCl, NaCl, 2 SO 4 , CaCl 2 , NH 4 Cl, etc.) to prepare seawater simulation liquid.

[0042] 2. Sample pretreatment: The simulated seawater sample is subjected to rapid distillation with a rapid distillation pretreatment device. Through condition optimization experiment, the optimal distillation time is 15min.

[0043] 3. Selection of eluent: test different eluent ratios, and finally determine that it is 27mmol·L-1MSA (methanesulfonic acid), which can make the ammonium ion peak out quickly.

[0044] 4. Separation and detection of ammonia nitrogen in actual complex matrix samples: According to the obtained optimized conditions, the actual complex matrix samples (Qiandao Lake water) were ...

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Abstract

The invention discloses a method for analyzing and detecting trace ammonia nitrogen in complicated matrix by combining a fast distillation method with ion chromatography technology. The method comprises the following steps: firstly, carrying out distillation pretreatment on a complicated sample to enrich and extract ammonium ions, and then detecting by using an ion chromatography method. The sample pretreatment refers to extraction of ammonium ions from the sample by using a fast distillation method, and concretely comprises the following steps: firstly adding excessive base into the sample, heating and boiling so as to release ammonium ions in a manner of ammonia gas without carrying other interference ions, and absorbing ammonia gas at an absorption part with excessive acid, thus obtain purified ammonium ions. The extracted ammonium is detected by using the ion chromatography method. The method is excellent in the ammonium extraction effect, capable of eliminating the interference of sodium ions, potassium ions and other anodic ions to the ammonium detection, convenient and sensitive, and fast and accurate.

Description

technical field [0001] The invention provides a method of enriching and extracting trace amounts of ammonia nitrogen in a complex matrix by means of fast distillation, and using ion chromatography in parallel to carry out ammonia nitrogen (in the form of NH 4 + form) a new method for analytical detection. Background technique [0002] Ammonia nitrogen content is one of the important indicators reflecting the degree of pollution of water bodies and the degree of eutrophication of lakes and reservoirs. For the determination of ammonia nitrogen content in water bodies, GB11894-89 alkaline potassium persulfate digestion ultraviolet spectrophotometry is usually used 1 . However, the determination process of this method is interfered by many factors, such as the detection wavelength of the ultraviolet spectrophotometer has a great influence on the accuracy of the analysis and determination results. Ion chromatography originated in 1975 and was proposed by Dr. H. Small of Dow Ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N30/88
Inventor 楼超艳朱岩
Owner ZHEJIANG UNIV
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