A method suitable for the determination of ammonia nitrogen content in water bodies with different salinities

A technology of ammonia nitrogen content and determination method, which is applied in the measurement of color/spectral characteristics, material analysis by observing the effect on chemical indicators, and analysis by chemical reaction of materials, etc., can solve the instability of sodium hypochlorite, color reaction Long time, unfavorable rapid analysis of investigation samples, etc., to achieve the effect of rapid response, simplified reagent preparation process, and reduced adverse effects

Active Publication Date: 2019-06-14
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that the operation is greatly affected by conditions such as temperature and salinity, and the color reaction time is long. It needs to use phenol with corrosive and pungent odor, sodium hypochlorite is unstable, and many operations need to use a fume hood. These are harsh The reaction conditions are not conducive to offshore field investigations and rapid analysis of large numbers of samples

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  • A method suitable for the determination of ammonia nitrogen content in water bodies with different salinities
  • A method suitable for the determination of ammonia nitrogen content in water bodies with different salinities
  • A method suitable for the determination of ammonia nitrogen content in water bodies with different salinities

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Embodiment 1

[0029] The invention is used to establish the ammonia nitrogen working curve of the seawater base.

[0030] Select 5 parts of seawater in the oligonutrient sea area with a salinity of 35, pass through a 0.45 μm filter membrane, add 0, 100, 300, 500, and 700 μL of ammonia nitrogen standard solution with a concentration of 25 mmol / L in sequence, and use the seawater to make up to 25.00 mL , to obtain ammonia nitrogen standard solutions with different concentration gradients. Take 3.00mL of the uncolored ammonia nitrogen standard solution and place them in a 1cm cuvette and scan it with a spectrophotometer to obtain its original spectrum. Add 3mL 500g / L trisodium citrate aqueous solution, 2mL 30g / L o-phenylphenol sodium aqueous solution, 1mL sodium dichloroisocyanurate concentration of 10g / L, and sodium hydroxide concentration of 60g / L to the remaining ammonia nitrogen standard solution in sequence High-alkaline sodium dichloroisocyanurate aqueous solution and 1mL 5g / L sodium ni...

Embodiment 2

[0034] The invention is used to establish the ammonia nitrogen working curve of the pure water base.

[0035] Select 5 parts of ultrapure water with a salinity of 0, add 0, 100, 300, 500, and 700 μL of ammonia nitrogen standard solutions with a concentration of 25 mmol / L in sequence, and use the pure water to dilute to 25.00 mL to obtain ammonia nitrogen standards with different concentration gradients. solution. In the ammonia nitrogen standard solution, add 2mL 30g / L sodium o-phenylphenate aqueous solution successively, 1mL sodium dichloroisocyanurate concentration is 10g / L, sodium hydroxide concentration is the high alkali sodium dichloroisocyanurate aqueous solution of 60g / L and 1mL of 5g / L sodium nitroferricyanide aqueous solution, each time a reagent is added, it needs to be oscillated and shaken up quickly, and after mixing thoroughly, the color is developed at room temperature for 15 minutes in the dark. Using ultrapure water as a reference, place the colored ammonia ...

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Abstract

The invention provides a determination method applicable to ammonia-nitrogen content in water bodies with different salinities, and relates to determination of pollutants in environment water bodies. The determination method comprises the following steps: filtering a water sample to be detected; after diluting and making the volume constant, adding a trisodium citrate water solution, a sodium o-phenylphenolate water solution, a high-alkali sodium dichloroisocyanurate water solution and a sodium nitroferricyanide water solution in sequence; sufficiently and uniformly mixing to realize coloration; selecting a blank matrix water sample with the salinity which is the same as or is similar to that of the sample to be detected, so as to prepare ammonia-nitrogen standard solutions with different concentration gradients; treating the ammonia-nitrogen standard solutions in a manner of treating the sample; determining light absorption values of the ammonia-nitrogen standard solutions at a fixed wavelength part by utilizing a spectrophotometer, and drawing a working curve; determining the colored water sample to be detected, and calculating to obtain uncorrected ammonia-nitrogen concentration of the sample; correcting and calculating the ammonia-nitrogen concentration by utilizing a salinity equation and dilution times, so as to obtain actual ammonia-nitrogen concentration of the water sample to be detected. The water sample is odorless and stable, and can be colored at room temperature; the determination method has the advantages of simple operation, good repeatability and high sensitivity, and can be used for determining the ammonia-nitrogen content in the water bodies with the different salinities.

Description

technical field [0001] The invention relates to the measurement of pollutants in environmental water bodies, in particular to a method for measuring ammonia nitrogen content in water bodies with different salinities. Background technique [0002] Ammonia nitrogen refers to the free ammonia (NH 3 ) and ammonium ions (NH 4 + ) in the form of nitrogen. Ammonia nitrogen in natural environmental water mainly comes from the decomposition products of nitrogen-containing organic matter in domestic sewage by microorganisms, some industrial sewage and farmland drainage. The non-ionic ammonia in ammonia nitrogen is extremely toxic to aquatic organisms, and the high content of total ammonia nitrogen can easily cause eutrophication of water bodies. At present, ammonia nitrogen, as the main excessive pollutant, occurs frequently in the seven major water systems, and ammonia nitrogen pollution has become a nationwide pollution problem. In water quality analysis, the determination of a...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G01N21/31G01N21/78
CPCG01N21/31G01N21/78
Inventor马剑陈钊英廖可薇林坤宁袁东星
OwnerXIAMEN UNIV