The appearance of urea is white, spherical particles, total nitrogen content ≥ 46.0%, easy to absorb moisture, and hygroscopicity is between ammonium sulfate and ammonium nitrate. Urea is easily soluble in water and liquid ammonia. When pure urea is heated to near the melting point under normal pressure, it begins to show instability, produces a condensation reaction, and produces biuret, which loses fertilizer effect on the crop. If you put a clean piece of iron on the stove and put the urea granules on it, it can be seen that the urea melts and volatilizes quickly, and a small amount of white smoke is emitted, which can smell ammonia.
The agricultural ammonium nitrate appearance is white or slightly gray crystal, with ammonia smell, nitrogen content ≥ 16.80% (secondary). It is highly hygroscopic, soluble in water, and the aqueous solution is weakly acidic. When you easily identify ammonium bicarbonate, you can use a finger to take a small amount of sample for rubbing, you can smell a strong ammonia smell.
The agricultural zinc sulfate has a white or micro-colored needle crystal. The zinc content of zinc sulfate heptahydrate should be ≥21.8%. Zinc sulfate is readily soluble in water and its aqueous solution is acidic.
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Manual Massage Foot Spa Massager
A manual massage Foot Spa Massager is a device designed to provide a relaxing and therapeutic foot massage. It is a manually operated handheld device, which means it does not require electricity or batteries to operate. The massager is made up of several parts, including the handle, rollers, and knobs.
To use the manual massage foot spa massager, you simply place your foot on a flat surface and apply the massager to the soles of your feet. The rollers and nodules stimulate the nerves and muscles in the foot, providing a deep tissue massage that helps relieve tension and pain.
The massager is small and lightweight, so you can easily take it with you wherever you go. It's also easy to clean, just wipe with a damp cloth after each use.
Overall, the Manual Massage Foot Spa Massager is a great option for those who are looking for an easy and effective way to relax and soothe their feet. It's affordable, easy to use, and can provide a range of health benefits, including improving circulation, reducing stress, and relieving foot pain and discomfort.
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