在规定条件下，将经过过滤的水样蒸发至干，烘干至恒重后留下的干固物，单位mg/L。可粗略反应水中的溶解性物质含量，也可能包括胶态物质。 溶解性固体，又称为总溶解固体、溶解性固体总量。通常水样经过滤后，滤液蒸干所得固体即为溶解性固体（DS）。在水处理当中起着不可或缺的作用，可以当做水质指标。
而且饮用水的硬度和总溶解性固体（ TDS）和当地居民心脏病的死亡率有确定的正相关性。
It has been found from some investigations that TDS and hardness of drinking water correlate with the lethal rate of heart disease of the local population.
贝克·兰德最初的目标是找出虫胶和清漆替代品，加入一些木屑后，将硬化成不受化学反应的非溶解性固体。
Baekeland's original goal was to come up with a shellac and varnish substitute that, after being applied to a piece of wood, would harden into an insoluble state by a chemical reaction.
开发出一种简单，方便，检测饮用水中溶解性总固体准确，经济的方法。
To develop an easy, convenient, accurate and economic method for detecting total dissolved solids in drinking water.
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