使用冻干方法进行制造产品是由于它在溶液中不稳定。
Products are manufactured in the lyophilized form due to their instability when in solution.
磷钼蓝法测定水中总磷，所用的抗坏血酸溶液很不稳定，只能保存数周。
When determining TP of water using Phosphorus Molybdenum Blue Method, ascorbic acid solution was unstable, can only be kept for several weeks.
性状：黑棕色粉末，溶于水，溶液不稳定。
Porperties: Black palm powder, solve in water, water solution is.
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