Fluoride reagent simple operation process

Author: 同奥科技

Abstract: 本文详细介绍了水样中氟化物浓度的测试步骤。首先对氟化物浓度进行预判，选择相应的操作步骤：0-2 mg/L范围内使用低量程，2-10 mg/L范围内使用高量程，超过10 mg/L则需稀释水样后测定。操作过程中，注意颜色变化（紫色）来指示浓度，并避免交叉污染。使用适当的移液工具，并定期校准移液枪（建议每周一次）以确保准确性。不同液体需使用不同的量具，避免使用不合适的工具量取小体积水样。

Concentration prediction:Before testing the water sample, first predict the fluoride value of the water sample, and select the operation steps corresponding to the range, e.g., predict the fluoride concentration value0-2mg/L, you need to select the operation procedure of 0-2mg/L range; If the fluoride concentration is expected to be 2-10mg/L, the procedure in the 2-10mg/L range is selectedSudden.

1. When the predicted value is in the range of 0-2L mg/L

If fluoride is present, the water sample will show a purple color, and the darker the water sample, the higher the concentration value. Analytical procedure: fluoride L; Watch out for overrange tips!

The simple operation process of fluoride reagent is shown in Figure 1

2. When the predicted value is in the range of 2-10mg/L

If fluoride is present, the water sample will show a purple color, and the darker the water sample, the higher the concentration value. Analytical procedure: fluoride H; Watch out for overrange tips!

Fluoride reagent simple operation process with Figure 2

3. When the predicted value exceeds 10mg /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

The simple operation process of fluoride reagent is shown in Figure 3

5. Precautions

◆ If there is fluoride, the water sample shows purple, 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.