Detection and variable time kinetic determination of micro and submicrogram amounts of nitrilotriacetic acid

Abstract

Aminopolycarboxylic acids2 are detected and determined, individually or in mixtures, by the reaction of cyanide ion with their nickel(ll) complexes in basic

Kinetic microdetermination of manganese in nonferrous alloys, and of nitrilotriacetic acid, ethylenediaminetetraacetic acid, and diethylenetriaminepentaacetic acid

“…These findings parallel reported data on the activating effect of NTA, EGTA, and 1,10-phenanthroline on the manganese-catalyzed reactions of periodate with malachite green (5-7), triethanolamine (10), and hypophosphite (4). These facts point to the independence of ligand modification from the indicator reaction, and suggest that this modification operates via a true metal complex catalysis by complexation of, probably, manganese(III) (6,12,13). NTA was chosen as activator for the determination of manganese, because it increased the sensitivity and the detectability of the method to a larger extent than the other tested compounds and because of its lower cost.…”

“…In other cases, the rate-increasing effect of complexing agents on the metal ion-catalyzed reactions has been used for their determination (4)(5)(6)(7).…”

Periodate oxidation and its contribution to instrumental methods of micro-analysis—A review

“…The following reports present examples of developed methods involving the catalytic action of Mn(II) for the determination of: (a) periodate directly, and ethyleneglycol or glycerol indirectly based on the redox reaction of ferroin with periodate in acidic media, followed by spectrophotometric monitoring the absorbance at 510 nm with fixed time method within the interval of 3 min [95], (b) reserpine in pharmaceutical drugs based on its catalyzed by Mn(II) or MnO 2 periodate oxidation in acidic media and spectrophotometric monitoring at 385 nm and using a FIA reactor with Mn(II) in solution or MnO 2 embedded on the walls of tygon tube incorporated in line with the FIA system [96], (c) Mn(II) using periodate oxidation of various indicator dye compounds [97][98][99][100][101][102][103][104][105][106][107][108][109][110][111][112] as shown in Table 4, (d) benzoate based on its inhibitory effect in Mn(II)-catalyzed periodate oxidation of Malachite Green according to proposed equations in the report [113], (e) simazine based on its inhibitory effect in the Mn(II)-catalyzed periodate oxidation of Malachite Green followed by spectrophotometric monitoring at 615 nm and applied to urine samples [114], (f) nitrilotriacetic acid based on its modifying effect in the Mn(II)-catalyzed periodate oxidation of Malachite Green followed by monitoring the time elapsed as the system evolves between two established chemical compositions and applied to samples of detergent formulations and natural water [115].…”

Catalytic methods of analysis: Characterization, classification and methodology (Technical Report)

“…Analytical aspects of the use of effects modifying the rate of a catalyzed reaction are shown in the following scheme: Nitrilotriacetic acid (NTA) is probably the most commonly determined activator. This acts upon the Mn"-catalyzed reactions of periodate with malachite green or phosphinate or Sb"' , respectively, and has been determined at concentrations of the order of mol dm'3 by the fixed concentration method [23]. Other examples are the determination of ascorbic acid (activation of the Vv-catalyzed reaction between 1-and C103-) and of citric acid (activating effect on the reaction between ferroin and Cr"' ).…”