Abstract

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；

Wei-Qin, Shou-Chong-Qi, Luo-Chuan-南, Du-Chun, Liu-Chuan-E. [J]. FOOD SCIENCE, 1997, 18(7): 58-61.

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