University of North Florida
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Stuart Chalk, Ph.D.
Department of Chemistry
University of North Florida
Phone: 1-904-620-1938
Fax: 1-904-620-3535
Website: @unf

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Classification: Commercial product -> photographic -> plate

Citations 1

"Flow Injection Determination Of Silver With Spectrophotometric Detection"
Fresenius J. Anal. Chem. 1997 Volume 358, Issue 4 Pages 475-479
A. A. Ensafi and K. Zarei

Abstract: Sample (170 µL) was injected into a stream (8 ml/h) of water which merged with streams (8 ml/h) of 0.8 M peroxodisulfate in 32 mM H2SO4 and of 18 mM 1,10-phenanthroline/0.42 mM gallocyanine and passed through a reaction coil (220 cm x 0.5 mm i.d.) before the absorbance was measured at 540 nm. The optimal temperature was 40°C. Tolerance limits for interfering ions are tabulated. Tolerance to bromide, chloride, iodide and thiosulfate was increased 1000-fold by digestion of sample with concentrated HNO3. The detection limit was 0.001 µg Ag and the analytical range was 0.002-0.7 µg. The RSD (n = 10) at 0.035 and 0.17 µg were 2.8% and 0.9%, respectively. The method was applied to river water after digestion with HNO3/H2SO4 and to panchromatic plates (photographic materials) after treatment with NaOH and digestion of the gelatinous film with HNO3. Results agreed with those obtained by AAS. Calibration graphs were linear.
Silver Sample preparation Spectrophotometry Detection limit Interferences Method comparison Heated reaction