利用MME和UTGE电极测定盐水中的铬

Chromium at the MME:
Electrolyte: Acetic acid, ethylenediamine, NH3
pH = 6.8 with NaOH or HCl
AE: Pt
RE: Ag/AgCl/KCl 3M
Parameters: DP polarography (-50 mV), SMDE
Ustart = +80 mV, Uend = -170 mV
Ep (Cr(VI)) = -50 mV