A highly selective flow injection s

A highly selective flow injection sorption system was developed for the fast determination of total iron in
food samples. Iron (III) was reduced to iron (II) by ascorbic acid and preconcentrated on a mini-column
packed with polyurethane foam (PUF) functionalized with N,N-bis(salicylidene)-1,3-propanediamine
(SPDA). The retained Fe (II) was eluted with hydrochloric acid and subsequently reacted to 2,4,6-tri(20-
pyridyl)-1,3,5-triazine (TPTZ) then measured at 593 nm. The procedure has resulted preconcentration
factor 36, sample frequency 20 h1 and detection limit 18 lg L1. The precision (RSD) was found to be
5.7% and 3.1% at concentration levels 0.1 and 5.0 lgmL1 iron (II), respectively. Finally, the method
was successfully applied to determination of total iron in reference material and food samples.

ผลลัพธ์ (อังกฤษ) 2:

A highly Selective sorption flow injection System was developed for the fast determination of total Iron in
Food samples. Iron (III) was reduced to Iron (II) by ascorbic acid and Preconcentrated on a Mini-column
packed with polyurethane foam (PUF) functionalized with N, N-bis (Salicylidene) -1,3-Propanediamine
(SPDA). Retained the Fe (II) Eluted with RCI was subsequently reacted to acid and 2,4,6-TRI (20-
pyridyl) -1,3,5-triazine (TPTZ) then measured at 593 NM. The procedure has resulted Preconcentration
factor 36, 20 H sample frequency? 1 and Detection Limit 18 lg L? 1. The Precision (RSD) was Found to be
5.7% and 3.1% at concentration levels 0.1 and 5.0 LgmL? 1 Iron (II), respectively. Finally, the method
was successfully Applied to total determination of Iron in Food Reference Material and samples.