Configuring standard samples is something that needs to be done frequently during experiments. Taking the experiment related to testing water quality indicators as an example, by configuring standard samples, by comparing the measured value with the reference value of the standard sample, one can determine whether the error of the testing instrument is within the specified range, and the other can verify whether the measurement method of the experimenter is correct. Therefore, configuring standard samples is of great significance to the reliability of the experiment.
The following will introduce the configuration process of the total phosphorus standard sample, come and take a look.
The first step is to prepare Lianhua Technology’s special consumables for total phosphorus-potassium dihydrogen phosphate (KH2PO4), distilled water, beaker, stirring rod, and 1000mL volumetric flask before configuration.
The second step is to take a small amount of potassium dihydrogen phosphate (KH2PO4) and dry it at 110℃ for 2 hours, and take it out after cooling.
The third step is to accurately weigh 0.2197 g of dried potassium dihydrogen phosphate (KH2PO4) and put it into a beaker, add about 100 ml of distilled water, stir until completely dissolved, then add 5 mL of analytical grade sulfuric acid, and then transfer it to a volumetric flask (the beaker can be rinsed three times with distilled water, and the rinse solution is also added to the volumetric flask), and finally dilute to 1000 mL.
Now, the 50 mg/L total phosphorus standard sample is ready. The prepared standard sample can be used to test and calibrate instruments, and the shelf life is generally 6 months.
The above is the configuration method of the total phosphorus standard sample in this issue. Follow me to learn more experimental knowledge!
Post time: Mar-31-2025
