Phthalic dicarboxaldehyde-NH3-Na2SO3 reaction-based flow injection spectrophotometry method for measuring Ammonia-N in water sample

A technology of -nh3-na2so3, o-phthalaldehyde, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of complicated operation, undiscovered, easy to be interfered, etc., and achieve the effect of fast analysis

Inactive Publication Date: 2015-12-30
GUILIN UNIV OF ELECTRONIC TECH
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Problems solved by technology

However, most of these methods are complex and susceptible to interference
However, it has not been found based on OPA (o-phthalaldehyde, o-phthaldialdehyde)-NH 3 -Na 2 SO 3 A report on the detection of ammonium nitrogen content in water samples by flow injection analysis combined with spectrophotometry to form a purple complex

Method used

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  • Phthalic dicarboxaldehyde-NH3-Na2SO3 reaction-based flow injection spectrophotometry method for measuring Ammonia-N in water sample
  • Phthalic dicarboxaldehyde-NH3-Na2SO3 reaction-based flow injection spectrophotometry method for measuring Ammonia-N in water sample
  • Phthalic dicarboxaldehyde-NH3-Na2SO3 reaction-based flow injection spectrophotometry method for measuring Ammonia-N in water sample

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Embodiment 1

[0079] Embodiment 1: the detection of concrete water sample

[0080] 1) Prepare ammonium nitrogen standard solution, OPA-Na 2 SO 3 Mixed solution and EDTA-NaOH buffer solution;

[0081]Ammonium nitrogen standard solution: 20 mL each of 0 μmol / L, 0.100 μmol / L, 0.300 μmol / L, 0.500 μmol / L, 0.700 μmol / L, and 0.900 μmol / L ammonium nitrogen standard solution;

[0082] Prepare OPA-Na 2 SO 3 Mixed solution, in which OPA, Na 2 SO 3 The concentrations were 1.06g / L and 0.050g / L respectively.

[0083] Prepare EDTA-NaOH buffer solution, EDTA-NaOH buffer solution is prepared by dissolving 26.0g EDTA disodium and 10.0g NaOH in 500mL ultrapure water.

[0084] 2) Adjust the valve position of the flow injection analyzer to the Fill state, start the active pump, and pump the 0 μmol / L ammonium nitrogen standard solution into the sample storage tube of the flow injection analyzer (the sample storage tube is a polytetrafluoroethylene tube, and its The length is 1.4-2.0m, the internal diamet...

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Abstract

The invention discloses a phthalic dicarboxaldehyde-NH3-Na2SO3 reaction-based flow injection spectrophotometry method for measuring Ammonia-N in a water sample. The method specifically comprises the step of adopting a flow injection analyzer and an ultraviolet-visible spectrophotometer to jointly measure Ammonia-N content in a water sample. An amaranth complex is generated based on an OPA(O phthalic aldehyde)-NH3-Na2SO3 reaction; the complex realizes strong absorption at a 550nm position, and has an absorbance value in direct proportion to Ammonia-N concentration in the water sample, thus creating the flow injection spectrophotometry method for measuring Ammonia-N in the water sample. The detection limit of the method can be as low as 0.007mmol/L, and measuring on Ammonia-N concentrations in various surface water can be realized; average substrate adding standard recovery rates of lake water, river water and groundwater are respectively 100.4 percent, 95.2 percent and 101.7 percent; besides, the analysis speed is high, and a result is not remarkably different from that of a indophenol blue spectrophotometry method.

Description

technical field [0001] The invention relates to a method for determining the content of ammonium nitrogen in water samples, in particular to a method based on o-phthalaldehyde-NH 3 -Na 2 SO 3 Reactive flow injection spectroscopic determination of ammonium nitrogen in water samples. Background technique [0002] Ammonium nitrogen (also known as ammonia nitrogen) refers to the free ammonia (NH 3 ) and ammonium ions (NH 4 + ) form of nitrogen, its composition ratio depends on the pH value and water temperature of the water. It is the most important form of inorganic nitrogen that can be directly used by phytoplankton in water bodies. Due to the impact of human activities, the content of ammonium nitrogen in some water bodies is relatively high, even reaching the level of poisoning aquatic organisms and destroying the ecological balance of water bodies. Therefore, ammonium nitrogen is a must-test indicator for water quality. At present, there are many methods for the dete...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/31
Inventor 严春梅梁英殷世民许金郭庆胡鸿志
Owner GUILIN UNIV OF ELECTRONIC TECH
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