Einsatz der registrierenden Spektralphotometrie

Experimental research of syneresis mechanism of HPAM/Cr3+ gel

“…To further explain the above result, the absorbance of Cr 3+ in different crosslinker solutions were measured according to the method of Ohls et al [36] Cr 3+ can form violet complex with EDTA in the temperature range of 70-80 • C, whereas Cr 6+ cannot react with EDTA at the same condition. The maximum absorption peak of the violet complex is at 538 nm, and the absorbance measured by the spectrophotometry is positively correlated with the content of Cr 3+ .…”

Geological and inorganic materials

“…Rao and Ramakrishna (166) determined traces of Cd in pure zinc materials and Ohls and Riemer (167,168) used recording spectrophotometry to simultaneously determine Cr(VI) and Cr(III) in oxidic materials and Cu and Ni in iron and steels.…”