摘要
研究了新试剂 2 (2 喹啉偶氮 ) 1,5 苯二酚 (QADHB)与银的显色反应 ,在 pH =5 0柠檬酸 氢氧化钠 (内含 0 0 1mol·L- 1 Na2 EDTA)缓冲介质中 ,十二烷基磺酸钠 (SDS)存在下 ,QADHB与银反应生成摩尔比为 2∶1的稳定络合物 ,该络合物可被WatersSep ParkC1 8固相萃取小柱萃取富集。富集在小柱上的络合物用乙醇 (含 1%乙酸 )洗脱后 ,在乙醇介质中 ,其吸收光谱的λmax=5 5 0nm ,ε=6 99× 10 4 L·mol- 1 ·cm- 1 。银含量在 0～ 1 2 μg·mL- 1 范围内符合比尔定律。方法用于环境水样中痕量银的测定 。
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 C 18 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 C 18 cartridge. The retained chelate can be eluted from cartridge with ethanol. In ethanol medium, The molar absorptivity is 6.99×10 4 L·mol -1·cm -1 at 550 nm. Beer′s law is obeyed in the range of 0-1.2 μg·mL -1. This method can be applied to the determination of silver in water with satisfactory results.
出处
《光谱学与光谱分析》
SCIE
EI
CAS
CSCD
北大核心
2004年第1期125-127,共3页
Spectroscopy and Spectral Analysis
基金
云南省教育厅和玉溪师院科研基金资助
