Tested
substances
Tested substances
to analyte ratio (w/w)
K+ 16000
Na+ 4000
Al3+ 1
Mg2+ 50
Zn2+ 10
Fe3+ 2
Cu2+ 0.5
Cl- 6000
NO3- 50
Glucose 1500
Sucrose 2000
Glycine 500
Table 1: Tolerance limits of interfering substances.