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RESEARCH PRODUCT
Flow spectrophotometric determination of ammonium ion
J. Martínez CalatayudM. Catalá IcardoI. Gil TorróL. Lahuerta Zamorasubject
Detection limitBromopyrogallol redChemistryCalibration curveAnalytical chemistryBiochemistryAnalytical ChemistryIonAmmoniachemistry.chemical_compoundSilver chlorideEnvironmental ChemistryAmmoniumTernary complexSpectroscopyNuclear chemistrydescription
Abstract A flow procedure is proposed for the determination of ammonium ion. The sample in basic medium is forced through a solid-phase reactor containing immobilized AgCl on polymeric pearl beads. The released Ag + , complexed with the ammonia, gives a blue ternary complex with the aid of bromopyrogallol red and 1,10-phenanthroline which is spectrophotometrically monitored at 636 nm. The calibration graph is linear over the range 1–20 μg ml −1 ammonium ion, detection limit ( s / n = 3) 0.35 μg ml −1 and relative standard deviation (slope) 1.9 % ( n = 7). The sample throughput is 48 h −1 . The influence of foreign compounds is studied and the procedure is applied to ammonium ion determination in pharmaceutical formulations and fertilisers.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1999-10-01 | Analytica Chimica Acta |