摘要
为了选择一种简便快速测定小麦铅含量的实验方法,选用小偃22、陕150、陕160、陕225和N9628等小麦品种(系)为试验材料,分别以HNO_3-H_2O_2、HNO_3-HClO_4、HNO_3-H_2SO_4为氧化剂,密封式压力罐消解小麦样品,氢化物发生—原子荧光光度计测定小麦中的铅含量。考察了小麦样品消解过程中采用混合酸的种类及用量、试样用量、还原剂硼氢化钠浓度等因素对测定结果的影响。结果发现该方法的最佳实验条件为:HNO_3-H_2O_2作为氧化剂有利于消解试样,试样用量为0.5～1g,NaBH_4浓度为2％。用此方法对实际小麦样品的回收率及方法的精度进行测定,回收率在89.8％～103.4％之间,相对标准偏差为1.90％,在0～200 ng·ml^(-1)范围内呈良好的线性关系(r=0.9997),方法的检测下限为0.02 ng·ml^(-1),可满足实际样品测定的要求。
An atomic fluorescence spectrometry method was established for determination of lead content in wheat in this experiement. The best test condition was obtained by studying effects of acid species and their dosage, sample dosage, NaBH4concentration etc. on the determination. A better linear relationship between the fluorescence intensity and the concentration of lead was found under the best condition for the lead concentration from 0 to 200 ng·ml-1(r= 0. 9997) , and its minimum was 0. 02 ng·ml-1(3σ, n=11) during detecting. The lead content in wheat of Xiaoyan 22, Shaan 150, Shaan 160, Shaan 225 and N9608 were determinated with this method, respectively and the range of its recovery rate was from 89. 8% to 103. 4%.
出处
《麦类作物学报》
CAS
CSCD
2003年第4期120-122,共3页
Journal of Triticeae Crops
关键词
小麦
铅
原子荧光法
含量测定
环境污染
Lead
Atomic fluorescence spectrometry
Wheat
NaBH4
HNO3-H2O2
