食品科学 ›› 1997, Vol. 18 ›› Issue (7): 58-61.

• 食品科学 • 上一篇    下一篇

SDG分离富集-1-(5-溴-2-吡啶偶氮)-2-萘酚-6-磺酸光度法测定食品中的痕量铅

  魏琴,  寿崇琦,  罗川南,  杜春,  刘传娥   

  1.  山东建材学院应用化学系
  • 出版日期:1997-07-15 发布日期:2011-12-19

   Wei-Qin,   Shou-Chong-Qi,   Luo-Chuan-南,   Du-Chun,   Liu-Chuan-E   

  • Online:1997-07-15 Published:2011-12-19

摘要:  研究了1-(5-溴-2-吡啶偶氛)-2-萘酚-6-磷酸(5-Br-PAN-S)与Pb2+的显色反应。试验结果表明,在pH8.5~10范围内Pb2+与5-Br-PAN-S生成了1:1的稳定配合物。该配合物在550nm处有一最大吸收,其表观摩尔吸光系数为2.2×104L/mol·cm,铅量在0~60ug/25ml范围内符合比尔定律。采用流基萄糖凝胶分离共存高于富集铅,使选择性提高,检测限降低,用于食品中痕量铅的测定,结果准确可靠。

关键词:  , 铅, 1-(5-溴-2-吡啶偶氮)-2-萘酚-6-磺酸, 巯基葡糖凝胶, 分光光度法

Abstract: The color reaction of lead with 1 - (5 -bromo- 2 -pyridylazo) - 2 -naphthol- 6-sulphonic acid (5- Br-- PAN - S) has been studied. Lead (I ) reacts with 5 -Br-PAN-S at pH 8. 5~ 10 to form a stable 1:1 complex in aqueous solution. Its apparent molar absorptivity is 2. 2 X 104 L/mol· cm at 550 nm. Beer’s law is obeyed in the range of 0~ 60ug/25mL for lead. The common metal ions can be separated,and lead can be enriched by sulfhydryl dextran gel, greatly improving the selectivity and sensibility of system. The niethod is used to determine samples with satisfactory results.

Key words:  , Lead (Ⅱ) 5-Br-PAN-S SDG Spectrophotometric;