Method for testing ammonia nitrogen by using flow injection analyzer and application thereof
A flow injection and analyzer technology, applied in the field of analysis and detection, can solve the problems of large changes in the acidity of the buffer solution and the deviation of the test results of the samples to be tested, and achieve the effect of improving stability
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Embodiment 1
[0050]In this example, the concentration of preparations are respectively 0.00mg / L, 0.10mg / L, 0.20mg / L, 0.50mg / L, 1.00mg / L, 3.00mg / L, 5.00mg / L, 8.00mg / L and 10.00mg / L For ammonia nitrogen standard solution of mg / L, use the method for measuring ammonia nitrogen in this scheme, and measure the absorbance values of different concentrations in the flow injection analyzer Baode BDFIA-8000. The parameters in the flow injection analyzer are set as follows: the needle washing time is 10s, injection time 140s, time to enter carrier flow 60s, time to reach valve 200s, peristaltic pump speed 35r / min, set temperature 2 to 50°C, injection time 60s, peak exit time 30s, peak width 55, sample cycle time 220s , set the temperature 1 to 120°C, the detector light source is a halogen lamp, and the wavelength is 660nm. Taking the ammonia nitrogen concentration as the abscissa and the corresponding absorbance as the ordinate, draw the working curve, and use the linear fitting method to obtain the...
Embodiment 2
[0064] The difference between this embodiment and Example 1 is that: the first aspect of this embodiment provides a method for testing ammonia nitrogen using a flow injection analyzer, and the method is based on a flow injection analyzer for testing, including the following step:
[0065] (1) Ammonia nitrogen distillation is carried out to the water sample to be tested by the distillation reagent to obtain analyte A; the solute of the distillation reagent is a mixture of sodium tetraborate and sodium hydroxide, and the solvent is ammonia-free, the specific preparation method of the distillation reagent Method: Add 600mL of ammonia-free water into a 1L volumetric flask, then weigh and dissolve 4.76g of sodium tetraborate, then add 0.272g of sodium hydroxide, mix well under magnetic stirring, and dilute to the 1L mark with ammonia-free water. Adjust the pH value of this solution to 9.5 with sodium hydroxide to obtain the distillation reagent. The sodium tetraborate was purchase...
Embodiment 3
[0076] The difference between this embodiment and Embodiment 1 is that: the first aspect of this embodiment provides a method for testing ammonia nitrogen using a flow injection analyzer, and the method is based on a flow injection analyzer for testing, including the following step:
[0077] (1) Ammonia nitrogen distillation is carried out to the water sample to be tested by the distillation reagent to obtain analyte A; the solute of the distillation reagent is a mixture of sodium tetraborate and sodium hydroxide, and the solvent is ammonia-free, the specific preparation method of the distillation reagent Method: Add 600ml of ammonia-free water into a 1L volumetric flask, then weigh and dissolve 4.76g of sodium tetraborate, then add 0.272g of sodium hydroxide, mix well under magnetic stirring, and dilute to the 1L mark with ammonia-free water. Adjust the pH value of this solution to 9.5 with sodium hydroxide to obtain the distillation reagent. The sodium tetraborate was purch...
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