摘要
In the acid medium,nitrite can diazotize with p-nitroaniline（PNA）and then couple with diethyl malonate（DM） in basic medium to produce an azo compound,which has the maximum absorption at 496 nm and a molar absorptivity(ε496) of 1.7×104L·mol-1·cm-1.A new spectrophotometric approach for nitrite determination was established on such basis with a detection limit of 1.7×10-7 mol/L.Beer’s law was obeyed in the concentration range of 0.05μg/mL-0.80 μg/mL for sodium nitrite.The proposed method has been applied for the determination of nitrite in vegetables,and the results are satisfactory.
In the acid medium, nitrite can diazotize with p- nitroaniline （PNA）and then couple with diethyl malonate （DM） in basic medium to produce an azo compound, which has the maximum absorption at 496 nm and a molar absorptivity （ ε496 ） of 1.7 × 10^4L· mol^-l . cm ^-1. A new spoetrophotometric approach for nitrite determination was established on such basis with a detection limit of 1.7 × 10 ^-7 mol/L. Beer＇ s law was obeyed in the concentration range of 0.05μg/mL - 0.80 μg/mL for sodium nitrite. The proposed method has been applied for the determination of nitrite in vegetables, and the results are satisfactory.
出处
《化学研究与应用》
CAS
CSCD
北大核心
2007年第1期115-117,共3页
Chemical Research and Application
