[Study on spectrophotometric determination of silver(I) with 2-(2-quinolinylazo)-1,5-dihydroxidebenzene].
The color reaction of silver(I) with 2-(2-quinolinylazo)-1,5-dihydroxidebenzene (QADHB) and the solid phase extraction of the colored chelate with Waters Sep-Park C18 cartridge were developed. In the presence of pH = 5.0 sodium citrate-sodium hydroxide buffer solution and sodium dodecyl sulfonate (SDS) medium, QADHB can reacts with silver to form a chelate of a molar ratio 1:2 (silver to QADHB). This chelate can be enriched by the solid phase extraction with Waters Sep-Park C18 cartridge. The retained chelate can be eluted from cartridge with ethanol. In ethanol medium, the molar absorptivity is 6.99 x 10(4) L x mol(-1) x cm(-1) at 550 nm. Beer's law is obeyed in the range of 0-1.2 microg x mL(-1). This method can be applied to the determination of silver in water with satisfactory results.
Tai
Xi
X
Department of Chemistry, Yuxi Normal College, Yuxi 653100, China.
Hu
Qiu-fen
QF
Yang
Guang-yu
GY
Yin
Jia-yuan
JY
D001554:Benzene / Q000737:chemistry; D012834:Silver / Q000032:analysis*; D018030:Silver Compounds / Q000737:chemistry; D012967:Sodium Dodecyl Sulfate / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods*; D013056:Spectrophotometry, Ultraviolet / Q000379:methods
D018030:Silver Compounds; D012967:Sodium Dodecyl Sulfate; D012834:Silver; D001554:Benzene