摘要
目的本研究采用火焰原子吸收光谱法测定食品中的铅。通过对比直接火焰法与4-甲基-2-戊酮(MIBK)萃取法对测定铅的灵敏度、重复性、最佳测定条件及线性范围进行了研究。方法灰化样品,对比直接测量法(MIBK)与萃取法检测灵敏度差异;铅标准溶液在0～3.00 mg/L时,曲线成线性关系,相关系数在0.999 0以上。结果铅浓度在0～0.3 mg/L时,2种方法对比,相对误差在0.50%～2.66%之间。直接法回收率为97.44%～98.68%,萃取法回收率为93.70～97.29%。结论 2种方法都可用于测定食品中的铅,结果满意。
Objective This article targets to measure the lead in foods through flame atomic absorption spectrometry methods（FAAS）. And the sensitivity,repeatability, optimum determination conditions to test lead are studied through the comparison of linear range between direct and MIBK extraction methods. Methods Ashing sampling and MIBK extraction methods are applied to measure the sensibility difference; When concentration of lead titrating solution is between 0-3.00 mg/L, the standard curve has a good linear relationship, and correlation coefficient is up to 0. 9990. Results The relative standard deviation （RSD） is 0. 50%-2. 66% , when the concentration is between 0-0.3 mg/L. The direct ashing recovery rate is 97.44%- 98.68%. MIBK extraction recovery rate is 93.70-97.29%. Conclusion Both methods are applicable and efficient in determining lead in foods.
出处
《国外医学（医学地理分册）》
CAS
2012年第1期52-54,59,共4页
Foreign Medical Sciences：Section of Medgeography
