Water quality analyzers are widely used in sewage detection in water plants, food, chemical, metallurgy, environmental protection and pharmaceutical industries, and are commonly used laboratory instruments. Can be used to determine turbidity, color, suspended matter, residual chlorine, total chlorine, combined chlorine, chlorine dioxide, dissolved oxygen, ammonia nitrogen (calculated as N), nitrite (calculated as N), chromium, iron , Manganese, Copper, Nickel, Zinc, Sulfate, Phosphate, Nitrate Nitrogen, Anionic Detergent, Odor and COD, etc. At the same time, 2 blanks are reserved for users, users can calibrate and use in the form of percentages according to their requirements , Provides convenience for customers. The following are some points that can not be ignored in the operation of the water quality analyzer, for your reference!
1. If the water sample in the test tube is splashed during digestion, please check
(1) Whether the prepared reagent has been left in the air for too long
(2) After the reagent is added to the water sample, is it shaken well?
(3) Whether it is analytical pure concentrated sulfuric acid or sulfuric acid has expired
(4) Whether the temperature of the digestion instrument is too high
2. The warm-up time of the host should be 15-20 minutes before the experiment
3. The COD test tube used in the experiment does not need to be washed with detergent. Generally, it is first washed with tap water and then washed with distilled water for drying to prevent the detergent from adhering to the inner wall and affecting the measurement result.
4. When pulling the rod of the measuring instrument, ensure that the cuvette to be measured is accurately aligned with the optical path.
5. After the reaction solution is poured into the cuvette, small bubbles will float up, which will affect the fluctuation of the digital display. When the number is stable, read it again.
6. For continuous measurement of multiple samples, pour the solution from the measured cuvette from a corner, rinse it with distilled water and carefully shake it away, then you can pour the new solution to be tested, and the error introduced is within the allowable range In order to make the error smaller, the COD value of the water sample can be increased from small to large during measurement.
7. When pouring the solution from the cuvette, do not splash the solution on the translucent viewing window of the cuvette. Before the colorimetric measurement, check whether the cuvette viewing window is clean. In addition to visual inspection, each colorimetric can be checked The optical density A of the dish is measured whether the relative value is consistent.
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