Sentence:  In the liquid phase runs the amount of <WSD>carbon</WSD> tetrachloride in each reaction tube was determined by weighing the tube before opening and weighing the fragments after emptying . 
Meaning of the word marked with <WSD> tags:  a colorless nonflammable liquid used as a solvent for fats and oils; because of its toxicity its use as a cleaning fluid or fire extinguisher has declined