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Oxalic acid is an organic substance, chemical form HCO It is a metabolite of living organisms. It is a moderately strong acid. It is widely distributed in plants, animals, and fungi, and performs different functions in different living organisms. Studies have found that more than 100 kinds of plants are rich in oxalic acid, especially spinach, amaranth, beet, purslane, taro, sweet potato and rhubarb and other plants have the highest content. Because oxalic acid can reduce the bioavailability of mineral elements, it is easy to form calcium oxalate with calcium ions in the human body and lead to kidney stones, so oxalic acid is often considered as an antagonist for the absorption and utilization of mineral elements. Its anhydride is carbon sesquioxide.

1.Aluminum sulfate is an inorganic substance with chemical formula of Al2(SO4)3 and formula amount of 342.15. 2.It is a white rasp-crystal crystalline powder with a density of 1.181g/ (25). 3.It is used as a precipitant for rosin wax emulsion and other adhesive materials in papermaking industry, as a flocculant in water treatment, and also as a retention agent for foam fire extinguishers to produce Aluminum white raw materials, oil decolorization deodorant and some pharmaceutical raw materials can also make artificial stones and advanced ammonium alum, accounting for about 50% of the total production of aluminum sulfate is used in papermaking, 4.The second largest use is in drinking water industrial water and industrial wastewater treatment as a flocculant, accounting for about 40% of the total production of aluminum sulfate When aluminum sulfate is added to such water, colloidal aluminum hydroxide flocs, which can absorb and precipitate bacterial colloid and other suspended matter, can be formed and used in drinking water treatment to control the color and taste of the water.