Publications by authors named "Dali Zhuo"
Permanganate index (COD) is one of the important indicators of surface water quality measurement. Herein, a portable analytical system was developed for on-site and rapid analysis of COD, organic substances in water were oxidized and transformed into gases, so that COD concentration was converted into a change of gas pressure signal, the pressure signal change was further detected by a gas pressure meter. Heating method and ultraviolet (UV) irradiation method were used as assisting technologies for oxidization of organic substances by acidic KMnO, a linear range of 2-150 mg l and a detectable limit of 2 mg l were obtained.
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- A portable analytical kit using a gas pressure meter was developed for quick detection of oxalate, utilizing a reaction of potassium permanganate and oxalate that generates CO2 to measure pressure change.
- The detection range is 0.1-6 μmol/mL with a limit of 0.064 μmol/mL, and the method successfully analyzed real samples (like spinach and beverages) achieving recoveries of 89-111%.
- To reduce interference from sample matrices, calcium chloride was used to precipitate oxalate, allowing for cleaner analysis by separating the precipitate through centrifugation or filtration.