#buffer_solution  a solution containing a buffer
  supertype:  #solution.mixture  a homogeneous mixture of two or more substances; frequently (but not necessarily) a liquid solution; "he used a solution of peroxide and water"
  substance:  #buffer
  subtype:  #starting_buffer  buffer solution at the start of a reaction
  subtype:  #phosphate_buffer_solution__PBS__pb  a solution containing a phosphate buffer

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