The actual purification effect of the faucet with purification function can be tested from many aspects such as water quality index detection, purification effect stability detection, health and safety detection. The following is the specific detection method:
Water quality index detection
Physical index
Turbidity: The turbidity value is determined by measuring the degree of scattering and absorption of light by the water sample. In general, the turbidity of the water after the treatment of the high-quality purification faucet should be significantly reduced, usually to below 1NTU.
Chroma: Using platinum-cobalt colorimetry or spectrophotometry, the color of water after normal purification should not exceed 15 degrees.
Chemical index
Heavy metal content: atomic absorption spectrometry and inductively coupled plasma mass spectrometry are used to detect the content of heavy metal elements such as lead, mercury, cadmium and chromium. For example, lead levels should be less than 0.01mg/L and mercury levels should be less than 0.001mg/L.
Residual chlorine: The use of DPD spectrophotometry or residual chlorine colorimeter detection, the general residual chlorine content after purification should be between 0.3-4mg/L.
Hardness: The EDTA titration method is used to detect the content of calcium and magnesium ions in water to determine the hardness of water, and the hardness of water after purification can generally be reduced to 100-200mg/L (measured by calcium carbonate).
Microbiological index
The total number of bacteria: The plate counting method is used to culture and count the bacteria in the water sample under certain conditions. The total number of bacteria in the purified water should not exceed 100CFU/mL.
E. coli: The use of multi-tube fermentation or filtration method, qualified purified water should not detect E. coli.
Stability detection of purification effect
Continuous operation detection: Let the faucet continue to run for a certain time, such as 24 hours or longer, sample and detect the water quality indicators at regular intervals, observe whether the purification effect is stable, and whether the indicators fluctuate within the qualified range.
Different water flow speed detection: Adjust the water flow speed of the faucet, respectively in the low, medium, high different water flow speed sampling detection, to see whether the purification effect is affected by the water flow speed. For example, at high water flow speed, indicators such as heavy metal removal rate and bacteria removal rate should not be significantly reduced.
Health safety testing
Material safety: Test whether the materials in contact with water meet health standards and release harmful substances. The faucet parts can be immersed in water under specific conditions through the immersion test, and then the content of harmful substances in the immersion solution is detected, such as the precipitation amount of heavy metals such as lead and cadmium should meet the relevant standards.
Microbial growth: After the faucet is used for a period of time, microbial detection is carried out on the inside of the faucet and the water to see if there is microbial growth. For example, to detect the presence of harmful microorganisms such as Legionella, if there is a breeding may affect the purification effect and safety of use.
Contrast detection
Comparison with unpurified water: At the same time, the raw water that has not been purified faucet treatment and the purified water are tested for various indicators, and the changes in water quality before and after purification are visually compared to evaluate the purification effect.
Comparison with other brands or types of purification faucets: Select other faucets with similar purification functions on the market for detection and comparison under the same conditions, analyze the differences between different products in terms of purification effect, performance, etc., so as to more comprehensively understand the actual level of the purification faucet.
When conducting these tests, it is best to be carried out by a professional third-party testing organization to ensure the accuracy and impartiality of the test results.
Post time: Mar-01-2025
