Solid Phase Extraction and Spectrophotometric Determination of Silver with 2-(2-Quinolylazo)-5-Dimethylaminophenol

Abstract

A new chromogenic reagent, 2-(2-quinolylazo)-5-Dimethylaminophenol (QADMAP) was synthesized, and a sensitive, selective, and rapid method was developed for the determination of the µ g/L level of silver ions. The method is based on the rapid reaction of silver(I) with QADMAP and the solid phase extraction of the colored chelate using a C 18 cartridge. The QADMAP reacts with Ag(I) in the presence of a citric acidsodium hydroxide buffer solution (pH 5.0) and a sodium dodecyl sulfonate (SDS) medium to form a violet chelate of molar ratio 1 : 2 (silver to QADMAP). This chelate was enriched by solid phase extraction with C 18 cartridge, and the retained chelate was eluted from the cartridge using ethanol (with 1% acetic acid). In the ethanol medium (with 1% acetic acid), the molar absorptivity of the chelate was 1.25 × 10 5 L mol -1 cm -1 at 584 nm. Beer's law was obeyed in the range 0.01-0.6 µ g/mL. The relative standard deviation for eleven replicate samples of 0.01 µ g/mL was 1.86%. The detection limit is 0.02 µ g/L in the original samples. The method was applied to the determination of µ g/L levels of silver ions in water with good results.

Solid Phase Selective and Extractive Preconcentration of Silver Ion from Aqueous Samples on Modified Silica Gel with 5-(4-Dimethylaminobenzylidene)-Rhodanine; Prepared by Sol-Gel Method

“…Accordingly, several selective solid phase extractors have been prepared by either physical loading or chemical binding of selected chelating reagents to silica gel for preconcentration of silver ion. [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] In this study, an easy and efficient method for the preparation of a modified silica gel sorbent for preconcentration of Ag + ion is introduced. A two-step sol-gel method 28 has been applied for the modification of silica gel and immobilizing of 5-(4-dimethylaminobenzylidene)-rhodanine (DBR) (Fig.…”

A cost-efficient synergistic behavior liquid-liquid extraction and spectrophotometric determination of silver(I) coupled with N'',N'''-bis[(E)-(4-fluorophenyl)methylidene] thiocarbonohydrazide: An industrial approach of analysis of real environmental samples

“…The color of extracted organic species was stable for more than 14 h. The method is simple, cost-efficient, novel, instant, sensitive and synergistic and has been applied for determination of silver(I) from pharmaceuticals, thin films, nano powders, hypo solutions, photographic wastes, X ray washings, pharmaceuticals. The developed method does not require more equilibrium time [31,34]; the preheating of aqueous phase [31,34]; surfactant [24,25,27,33,36] and does not use any sophisticated instruments. Silver(I) reacts with [bis-(4-fluoroPM)TCH] in iso amyl acetate in absence of pyridine but sensitivity is very low.…”

“…The literature survey revealed that only a few thiols, phenyl thiosemicarbazones and were employed for extractive determination of silver(I) [24][25][26][27][28][29][30][31][32][33][34][35][36]. A comparison of a few selected spectrophotometric determination methods of silver(I) with their spectral characteristics and drawbacks are summarized in Table 1.…”

Rapid and Sensitive Synergistic Extraction and Spectrophotometric Determination of Silver(I) using 1-(2′,4′-Dinitro aminophenyl)-4,4,6-trimethyl-1,4-dihydropyrimidine-2-thiol: Analysis of Real Samples

“…But the spectrophotometric method still has the advantage of simplicity and does not need expensive or complicated test equipment. For this reason, a wide variety of spectrophotometric methods have been reported − for determination of silver(I) (Table ). Each chromogenic system has its advantages and disadvantages with respect to sensitivity, selectivity, and rapidity.…”