[Determination of trace tin in food by solid-phase spectrophotometry].
A new method for the determination of trace amounts of tin by resin-phase spectrophotometry has been developed and the detailed experimental conditions investigated. Tin ion reacts with procatechol violet(PV) in potassium hydrogen phthalate-HCl buffer media(pH2.5) to form a stable complex. The complex enriched on an anion-exchange resin has a maximum absorption wavelength of 570 nm. The absorbance is directly proportional to the concentration of tin in the region of 0-150 micrograms.L-1 with an apparent molar absorptivity of 7.2 x 10(6) L.moL-1.cm-1. Most of the co-existed metal ions do not interfere the determination of tin ion. The developed procedure has been successfully employed to the determination of tin in some food examples.
Ni
Gang
G
Department of Chemistry, Northwest Normal University, Lanzhou 730070, China.
Yuan
Li
L
Gao
Jin-zhang
JZ
D000818:Animals; D002417:Cattle; D005504:Food Analysis; D005519:Food Preservation; D008892:Milk / Q000737:chemistry; D012275:Oryza / Q000737:chemistry*; D013055:Spectrophotometry, Infrared / Q000379:methods; D013056:Spectrophotometry, Ultraviolet / Q000379:methods; D014001:Tin / Q000032:analysis*
D014001:Tin