title: [Study on solid-phase-extraction spectrophotometric determination of silver with p-sulfobenzylidene-rhodanine].
abstract: The color reaction of silver with p-sulfobenzylidene-rhodanine (SBDR) was studied. Based on the color reaction of SBDR with silver (I) and the solid phase extraction of its colored complex with Waters Porapak Sep-Park-C18 cartridge, a new method for the determination of micro-amount of silver (I) was studied. In the presence of pH = 2.8 citric acid-sodium hydroxide buffer solution and Tween-80 medium, SBDR can react with silver (I) to form a stable 2:1 complex. The colored complex can be extracted by C18 cartridge and eluted by ethanol (containing 5% acetic acid), and then can be determined by spectrophotometry. The molar absorptivity is 7.53 x 10(4) L x mol(-1) x cm(-1) at 520 nm. Beer's law is obeyed in the range of 0-1.2 microg x (25 mL)(-1). This method can be applied to the determination of silver in water with satisfactory results.
authors.affiliation: The School of Chemistry and Bio-Science, Yunnan University for Nationalities, Kunming 650031, China.
authors.forename: Lin
authors.initials: L
authors.lastname: Wang
authors.forename: Qiu-fen
authors.initials: QF
authors.lastname: Hu
authors.forename: Guang-yu
authors.initials: GY
authors.lastname: Yang
authors.forename: Jia-yuan
authors.initials: JY
authors.lastname: Yin
mesh_terms: D004784:Environmental Monitoring / Q000379:methods; D012236:Rhodanine / Q000032:analysis / Q000737:chemistry; D012834:Silver / Q000032:analysis* / Q000302:isolation & purification; D018030:Silver Compounds / Q000032:analysis*; D052616:Solid Phase Extraction / Q000379:methods*; D013053:Spectrophotometry / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D018030:Silver Compounds; D014874:Water Pollutants, Chemical; D012834:Silver; D012236:Rhodanine