Method for measuring nitrite
A nitrite and solution technology, applied in the direction of color/spectral characteristic measurement, etc., can solve the problems of secondary pollution, strong carcinogenicity of reagents, hazards, etc.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0040] Sample pretreatment: Water samples were taken from the tributaries of the Huangpu River and the campus pond, and the water samples were left to stand for 30 minutes, and 25 mL of the supernatant was taken.
[0041] Determination of samples: Use a pipette to pipette 10.0mL of water sample into a 25mL colorimetric tube, add 1.0mL of 1% potassium bromide aqueous solution in turn, 1.0×10 -2mol / L 2-amino-5-naphthol-7-sulfonic acid aqueous solution 1.0mL, then add 1.5mol / L hydrochloric acid aqueous solution 1.5mL, shake well to make diazo solution, its pH value is 1.0, put the solution on stand 1min, a diazonium salt solution was generated. Take another 25mL volumetric flask and add 3mL of 1.0mol / L sodium carbonate aqueous solution. Transfer the diazonium salt solution in the colorimetric tube to the volumetric flask filled with sodium carbonate aqueous solution, then rinse the colorimetric tube with a small amount of deionized water, transfer the washing solution into the v...
Embodiment 2
[0049] Sample pretreatment: Water samples were taken from the tributaries of the Huangpu River and the campus pond, and the water samples were left to stand for 30 minutes, and 25 mL of the supernatant was taken.
[0050] Determination of samples: Use a pipette to pipette 10.0mL of water sample into a 25mL colorimetric tube, add 1.0mL of 1% potassium bromide aqueous solution in turn, 1.0×10 -2 mol / L 2-amino-5-naphthol-7-sulfonic acid aqueous solution 1.0mL, then add 1.5mol / L hydrochloric acid aqueous solution 1.0mL, shake well to make diazonium solution, its pH value is 1.5, put the solution on stand 3min, a diazonium salt solution was generated. Take another 25mL volumetric flask and add 5mL of 1.0mol / L sodium carbonate aqueous solution. Transfer the diazonium salt solution in the colorimetric tube to the volumetric flask filled with sodium carbonate aqueous solution, then rinse the colorimetric tube with a small amount of deionized water, transfer the washing solution into ...
Embodiment 3
[0058] Sample pretreatment: Water samples were taken from the tributaries of the Huangpu River and the campus pond, and the water samples were left to stand for 30 minutes, and 25 mL of the supernatant was taken.
[0059] Determination of samples: Use a pipette to pipette 10.0mL of water sample into a 25mL colorimetric tube, add 1.0mL of 1% potassium bromide aqueous solution in turn, 1.0×10 -2 mol / L 2-amino-5-naphthol-7-sulfonic acid aqueous solution 1.0mL, then add 1.5mol / L hydrochloric acid aqueous solution 0.2mL, shake well to make diazo solution, its pH value is 2.0, put the solution on stand 5min, a diazonium salt solution was generated. Take another 25mL volumetric flask, add 6mL of 1.0mol / L sodium carbonate aqueous solution. Transfer the diazonium salt solution in the colorimetric tube to the volumetric flask filled with sodium carbonate aqueous solution, then rinse the colorimetric tube with a small amount of deionized water, transfer the washing solution into the vol...
PUM
| Property | Measurement | Unit |
|---|---|---|
| Concentration | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More