Where X1
is the POV, in milligram equivalent per
kilogram (meq kg-1). V is the volume of sodium thiosulfate
solution (STS) used for the dete-rmination, in
millilitres (mL); V0
is the volume of STS used for the
blank determination, in millilitre (mL); c is the concentration
of the STS, in moles per litre (mol L-1); m is the
mass of the test portion, in grams (g).