悬浮物测定时滤纸上可溶物的影响及消除

采用中速定量滤纸为滤料测定悬浮物时，滤纸上可溶物含量约0．25％，经水过滤后溶解于水，影响测定值．所以滤纸用前先用蒸馏水冲洗过滤几遍，以除去可溶性物质，再烘干至恒重，待用．

Affection and Remove of the Soluble Materials on Strain Paper When Suspended Materials Is Surveyed

The soluble materials on strain paper is about 0.25 percent when suspended materials is surveyed in strainer of middle speed ration strain paper. When distilled water pass throngh a strain paper, the soluble materials are solubilized in water, it will affect the survey result. So before being used, the strain paper must be flushed and filtered by distilled water again and again, that the soluble materials can be put out, then drying to fixed weight for using.