水溶液悬浮法：将少量农药倒入容器内，先加少量清水调成糊状，然后再加清水搅拌均匀，静置观察，未变质的农药悬浮性好，粉粒沉淀速度慢，沉淀数量少，反之，则为程度不同的变质失效农药。 溶剂加热法：将农药溶剂连瓶放入温水中，待吸热后，未变质农药其沉淀物会自然慢慢溶化 Aqueous suspension method: a small amount of pesticides into the container, add a small amount of water first tune into a paste, and then add water Stir, stand observation, unmodified pesticide suspension is good, particle precipitation slow, less precipitation, On the contrary, it is a different degree of deterioration of pesticides. Solvent heating method: the pesticide solvent bottle into warm water, until the endothermic, unmodified pesticide its precipitate will slowly dissolve slowly