Take the solution after alkali melting and desilication, add excess EDTA standard solution, heat and boil under the condition of pH6 to complex EDTA with elements such as iron, aluminum, titanium, etc., and drip excess EDTA with zinc standard solution. Then add potassium fluoride, heat and boil to replace the EDTA complexed with potassium fluoride and aluminum and titanium to the solution, and then titrate the released EDTA with zinc standard solution, measure the aluminum and titanium content, and subtract the amount of titanium to get aluminum the amount. Potassium fluoride can only be replaced with EDTA complexed with aluminum and titanium, but not with EDTA complexed with metal elements such as iron, copper, lead, and zinc, so it does not interfere with the determination.
Armchairs usually have soft padding and comfortable cushions, providing good support and wrapping, so you don't get tired even if you sit for a long time. The armrests can support the arms and relieve the pressure on the shoulders and neck. There are many styles of armchairs, from classic British style to modern and simple design, there is always one that suits your home style. Exquisite fabrics and exquisite details can enhance the overall style of the space. In addition to being a seat, armchairs can also be used as reading corners, seating areas, and even as decorations to embellish the space.
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