Simple operation process of sulfide reagent

Concentration prediction: Before testing the water sample, the sulfide value of the water sample is first predicted, and the operation steps corresponding to the range are selected, for example, the sulfide concentration value is predicted0-0.8 mg/L, you need to select the procedure for the 0-0.8 mg/L range; If the sulfide concentration is predicted to be 0.8-4 mg/L, the 0.8-4 mg/L range is chosenProcedure.

1. When the predicted value is in the range of 0-0.8mg/L

If sulfides are present, the water sample will appear blue, and the darker the water sample, the higher the concentration value. Analytical procedure: sulfide L; Watch out for overrange tips!

2. When the predicted value is in the range of 0.8-4mg/L

If sulfides are present, the water sample will appear blue, and the darker the water sample, the higher the concentration value. Analytical Procedure: Sulfide H; Watch out for overrange tips!

3. When the predicted value exceeds 4 mg/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 there is sulfide, the water sample shows blue, 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: 2mL 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.