Làm thế nào đến chính xác và hiệu quả hiệu chuẩn thứ ba điểm của pH mét% 3f
1. The amount of pH correction at the third point mainly depends on your sample situation. As mentioned before, there are many calibration solutions available from pH 1.68 to 12.46, and the appropriate calibration solution is selected based on the final pH range of the sample. We commonly use 4.00, 6.86, and 9.18. If your sample is more alkaline, you need 9.18% 2c 10,01% 2c và 12,46. The calibration sequence varies depending on the situation of different instruments. Some require calibration in sequence, while others do not. The instrument will automatically recognize it and please refer to to relevant instrument user manual.
2. No matter what type of pH meter it is, the point of pH=7 must be corrected, and the point of pH=7 must be corrected first when calibrating at two point. Starting from 7.0, the selected standard solution is related to the pH value of the solution to be measured, so that the pH value of the solution can fall within the calibrated pH range. Generally, two points are enough to meet the requirements, and the third point is only considered if the requirements are high. Some instruments can calibrate three points and have a mode to choose from, which can be used direct. For some that are not available, it is generally done through two point and two point proofreading, which means two earreading twice.
3. Chúng tôi thường sử dụng a hiệu chuẩn trình tự của 7% 2c4% 2c10. Đầu tiên hiệu chuẩn độ axit và sau đó hiệu chuẩn độ kiềm độ kiềm.
Nhận Chăm sóc
1. When the electrode is not in use, fully immerse it in the electrode protection solution. The electrode protection solution should be replaced in a timely manner, once a week. Do not soak or soak in pure water with detergent or other absorbent reagents.
2. Khi nào đo lường dung dịch với cao nồng độ, thử đến rút ngắn đo lường thời gian as much as có thể% 2c và cẩn thận làm sạch chúng sau khi sử dụng đến ngăn chặn đo lường dung dịch từ tuân thủ đến điện cực và ô nhiễm nó.
3. Sau khi làm sạch điện cực, do không sử dụng không bụi giấy đến lau kính phim. Thay vào đó, sử dụng không bụi giấy đến khô đến tránh làm hỏng thủy tinh phim% 2c ngăn chặn chéo ô nhiễm% 2c và ảnh hưởng đo lường độ chính xác.
4. During measurement, pay attention to that the silver Silver chloride internal reference electrode of the electrode should be immersed in the chloride buffer solution in the bulb. When the external reference solution is less than 1/3, it should be added in time to avoid the number jumping phenomenon in the electrode display part. When using, be careful to gently shake the electrode a few times.
5. Điện cực nên không be used in strong acids, alkalis, or other ăn mòn dung dịch.
6. It is strictly prohibited to use it in dehydrating media such as anhydrous ethanol, Potassium dichromate, etc.
7. The pH standard buffer should be sealed and stored in a dry place.
8. The transferred standard buffer solution must be stored in a clean and dry container. During each calibration, the electrode should be washed clean and sucked dry with dust-free paper to prevent contamination and dilution of the standard buffer solution. After using the standard buffer solution, it should be sealed with a sealing film and placed in a dry place for multiple uses. When turbidity, mold, or precipitation are found in the transferred standard buffer solution, it cannot be used again.
