titrate       
verb [ T ] uk/taɪˈtreɪt/ us/taɪˈtreɪt/
 chemistry specialized用滴定法测量 
to measure how much of a substance is in a liquid by adding it to measured amounts of another substance that reacts to it, for example, by making it change colour
  The sample is titrated at a pH near 10 with EDTA solution until a colour change occurs.
 Water samples were taken at many depths and every sample that came back was titrated on board ship.
 A solution of hydrochloric acid was titrated against a standard sodium hydroxide solution.