“…Several 2oxoacids were analyzed after reaction with o-phenylenediamine (957). Cis and trans aconitrates in plant material were determined polarographically (118), while oscillopolarography was used for the analysis of cysteic acid levels in fingernails after chronic irradiation (307). Procedures for the determination of trace levels of nitrilotriacetic acid in lake water were reported (24, 818).…”