Determination of glyphosate mono-isopropylamine salt in process samples using flow injection analysis with tris(2,2a-bipyridyl)ruthenium(II) chemiluminescence detection

The mono-isopropylamine salt of glyphosate was selectively determined directly in industrial and commercial formulations using flow injection analysis with tris(2,2'-bipyridyl)ruthenium(II) chemiluminescence detection without the need for separation. Glyphosate and its mono-isopropylamine salt furnished detection limits of 7×10-9 and 3.5×10-10 M and relative standard deviations of 0.4% at 1×10-7 M and 0.8% at 5×10-8 M, respectively. The methodology is robust and reliable with samples subjected only to aqueous dilution prior to analysis.