【摘要】 目的:建立石墨炉原子吸收光谱法同时测定尿中铅(浓度变化范围大)的检测方法。方法:应用动态三磁场塞曼校正技术的石墨炉原子吸收光谱仪,通过磁场优化,采用氯化钯作基体改进剂,在283.3 nm波长下进行测定。结果:采用动态3-磁场模式测定时,还可同时得到2-磁场模式的数据和校正曲线,2-磁场标准曲线段(0.0μg/L~80.0μg/L):y=0.0048x+0.0145,r=0.9997;3-磁场标准曲线段(80.0μg/L~600.0μg/L):y=0.0013x+0.0308,r=0.9998;最低检出浓度2.0μg/L;回收率94.6%~104.8%;RSD为0.60%~3.72%。结论:该方法保持两种磁场模式的优点:检出限低、快速(样品无需再稀释)、准确、线性范围宽(0.0μg/L~600.0μg/L);可应用于职业接触和非职业接触尿中铅的同时测定,低浓度采用灵敏度较高的2-磁场模式数据处理,高浓度可采用线性范围宽的3-磁场模式计算。更多还原

【Abstract】 Objective:To develop a method for direct determination of lead in urine by GF-AAS. Methods:Lead in urine samples was determined by GF-AAS with the dynamic thimagnetic field Zeeman correction technique at wavelength of 283. 3 nm,with palladium chloride as the matrix modifier. Results:With dynamic trimagnetic field mode,data and the correction curve of two magnetic field can also be obtained,the standard curve(0 μg/L ~ 80μg/L) was y = 0. 0048x + 0. 0145,r = 0. 9997; while the standard curve(80 μg/L ~ 600 μg/L) of 3-magnetic field was y = 0. 0013x + 0. 0308,r = 0. 9998. The detection limit was 2. 0 μg/L; the recovery rate was 94. 6% ~104. 8%; RSD was 0. 60% ~ 3. 72%. Conclusion:The method includes advantages of the two kinds of magnetic field models:low detection limit,rapidity(sample without dilution again),accuracy,wide linear range(0 μg/L~ 600 μg/L). The method can be used in the occupation exposure and non-occupation exposure of lead deter mination in urine. Low-concentration data was processed by the 2-magnetic field standard curve,while high-concentration data was processed by the 3-magnetic field standard curve.更多还原