The metal purification efficiency of the water purifier refers to the efficiency of the water purifier to remove heavy metals in the water during the filtration process. Water purifiers typically employ multiple filtration systems, including activated carbon, ultrafiltration, reverse osmosis, and other technologies, to remove impurities and harmful substances, including heavy metals, from the water. Metal purification efficiency is one of the important indicators to evaluate the performance of water purifiers, which is usually expressed in terms of removal rate, that is, the proportion of heavy metals that water purifiers can remove in water.
Scaling solution requirements
The spike solution for the metal purification efficiency test should meet the requirements of Table 1.
Table 1 Requirements for spiking solution for metal purification efficiency test.
Test Method:
According to the standard "GB T 30307-2023 Drinking Water Treatment Devices for Household and Similar Uses", the water supply system of the test device is introduced with a spiking solution that meets the corresponding requirements of Table 1, and the inlet water pressure is (024±0.02) The spike solution was passed under the condition of MPA for testing. When % of the nominal rated total water purification of the drinking water treatment unit is reached, sampling is carried out at the inflow sample sampling point and the outflow sample sampling point. The amount of each sample should not exceed 1 L or 4 times the amount required for analysis, whichever is greater. The collection, storage and testing of samples are carried out in accordance with the methods specified in GB T 5750 (all parts), and the tests not specified in GB T 5750 (all parts) are carried out with reference to other relevant standards at home and abroad.
Purification efficiency calculations
Consult the Chinese Academy of Sciences.