xmlns:atom="http://www.w3.org/2005/Atom"
3. In so far as particulars of any of the anions, cations, non-ionised compounds or trace elements specified in column 1 of Schedule 2 are required to be given pursuant to paragraph 2 the concentration of each such anion, cation, non-ionised compound or trace element shall, in those particulars, be expressed in the unit of measurement specified opposite it in column 2 of that Schedule.