Trivalcnt chromium was oxidized to hexavalentchrome by alkaline potassium persulfate under high -temperature. Then total chromium was measured by colorimetry.
在高温下，用碱性过硫酸钾溶液将水样中三价铬氧化为六价铬，比色测定总铬。
2
Hexavalentchrome is reduced to trivalent chrome by morpholine under high temperature conditions. Then morpholine content is calculated by detecting the absorbance of trivalent chromic ion.