Simple operation process of nitrite reagent

Concentration prediction:Before testing the water sample, the nitrite value of the water sample is predicted, and the operation steps corresponding to the range are selected, e.g., the nitrite concentration is predictedIf the degree value is 0-0.2mg/L, you need to select the operation procedure of the 0-0.2mg/L range; If the nitrite concentration is predicted to be 0.2-1mg/L, the amount of 0.2-1mg/L is chosenprocedure.

1. When the predicted value is in the range of 0-0.2mg/L

If nitrite is present, the water sample will appear red, and the darker the water sample, the higher the concentration value. Analysis procedure: NO2L; Watch out for overrange tips!

2. When the predicted value is in the range of 0.2-1mg/L

If nitrite is present, the water sample will appear red, and the darker the water sample, the higher the concentration value. Analysis procedure: NO2H; Watch out for overrange tips!

3. When the predicted value exceeds 1 mgL /L

The water sample needs to be diluted to the corresponding concentration value in sections 1-2 above, and then operated according to the corresponding range, and the determination result is multiplied by the dilution factor.

4. Test steps on the computer

5. Precautions

◆ If nitrite is present, the water sample shows red, and the darker the color, the higher the concentration value of the water sample.

◆ Pay attention to cross-contamination, use different measuring utensils for different liquids (pay attention to changing the tip when using a pipette).

◆ Use appropriate pipetting tools to take liquids, and large range measuring tools cannot measure small volumes of water samples, such as: 5mL pipettes cannot be used to remove 2mL and below liquidsFor liquids less than or equal to 2mL, it is recommended to pipette twice with a 1mL pipette.

◆ When using a pipette, it is necessary to calibrate the pipette frequently (it is recommended to do so once a week), and pay attention to replacing the tip during use.