悬浮液进样-石墨炉原子吸收光谱法测定巴戟天中痕量铅和镉
GF-AAS Determination of Trace Amounts of Lead and Cadmium in Morinda Officinalis with Direct Suspension Sample Introduction
摘 要
取经烘干粉碎并通过0.074 mm网筛的巴戟天样品0.050 0 g，加入琼脂溶液10.0 mL（其中含磷酸二氢铵0.1 g，作为基体改进剂），超声振荡5 min，制成样品的悬浮液，直接进样，采用石墨炉原子吸收光谱法测定其中铅和镉的含量。设置铅和镉的灰化温度分别为850℃和800℃。结果表明：铅和镉的质量浓度在一定范围内与其吸光度呈线性关系，铅和镉的检出限（3s×V/b）分别为2.17×10-9mg和3.4×10-10mg。按照标准加入法进行加标回收试验，铅和镉的回收率分别在98.8%~103%和98.3%~104%之间。精密度试验表明铅和镉的测定值的相对标准偏差（n=7）分别为2.7%和1.2%。
悬浮液进样
铅
镉
巴戟天
graphite furnace atomic absorption spectrometry
suspension sample introduction
lead
cadmium
morinda officinalis
Abstract
0.050 0 g of the dried and powdered morinda officinalis sample (passed through 0.074 mm sample sieve) was taken and dispended in 10.0 mL of agar solution (containing 0.1 g of NH4H2PO4 as matrix modifier) with an ultrasonotor for 5 min, to make a suspension of the sample which was introduced into the instrument for GF-AAS determination of lead and cadmium. Ashing temperatures for lead and cadmium were set at 850℃ and 800℃, respectively. As shown by the results, linear relationships between values of absorbance and mass concentration of lead and cadmium were found in definite ranges, with detection limits (3s×V/b) of 2.17×10-9mg and 3.4×10-10mg respectively. Test for recovery was made by standard addition method, giving results in the range of 98.8%-103% and 98.3%-104%, respectively. Values of RSDs (n=7) were found 2.7% (for Pb) and 1.2% (for Cd).
中图分类号 O657.3 DOI 10.11973/lhjy-hx201904011
所属栏目 工作简报
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收稿日期 2018/9/26
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备注孙杨杨,硕士研究生,研究方向为中药鉴定和产地研究
引用该论文: SUN Yangyang,CHEN Yu'e,ZHONG Huiyi,HUANG Haibo. GF-AAS Determination of Trace Amounts of Lead and Cadmium in Morinda Officinalis with Direct Suspension Sample Introduction[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2019, 55(4): 432～436
孙杨杨,陈玉娥,钟慧怡,黄海波. 悬浮液进样-石墨炉原子吸收光谱法测定巴戟天中痕量铅和镉[J]. 理化检验－化学分册, 2019, 55(4): 432～436
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【3】丁平,刘硕,刘瑾,等.巴戟天中微量元素与土壤中矿质元素的相关性分析[J].华西药学杂志, 2010,25(6):727-729.
【4】陈荣溢,宋婷婷.广东植物类中药材出口现状及对策初探[J].广东农业科学, 2007,39(2):105-106.
【5】孙汉文,温晓华,梁淑轩.悬浮体进样-基体改进效应石墨炉原子吸收光谱法直接测定土壤中的铅和镉[J].光谱学与光谱分析, 2006,26(5):950-954.
【6】苏耀东,刘宏,王伟锋,等.超声搅拌悬浮液进样石墨炉原子吸收测定海洋沉积物中的痕量镉[J].理化检验-化学分册, 2000,36(11):506-507.
【7】TINAS H, OZBEK N, AKMAN S. Determination of lead in flour samples directly by solid sampling high resolution continuum source graphite furnace atomic absorption spectrometry[J]. Spectrochimica Acta Part B:Atomic Spectroscopy, 2018,140:73-75.
【8】AMORIM F A C, COSTA V C, GUEDES W N, et al. Multivariate optimization of method of slurry sampling for determination of iron and zinc in starch samples by flame atomic absorption spectrometry[J]. Food Analytical Methods, 2016,9(6):1719-1725.
【9】DOS SANTOS W N L, CAVALCANTE D D, MACEDO S M, et al. Slurry sampling and HG AFS for the determination of total arsenic in rice samples[J]. Food Analytical Methods, 2013,6(4):1128-1132.
【10】PENG Y, GUO W, ZHANG P, et al. Heat-assisted slurry sampling GFAAS method for determination of lead in food standard reference materials[J]. Journal of Food Composition and Analysis, 2015,42:78-83.
【11】邓世林,李新凤,邓富良.固体悬浮液进样石墨炉原子吸收法测定茶叶中的微量镉[J].食品科学, 2004,25(2):141-143.
【12】陈江,周李,姚恩亲.悬浮液进样石墨炉原子吸收法测定茶叶中镍含量[J].光散射学报, 2011,23(1):70-74.
【13】张锂,韩国才.悬浮液进样-石墨炉原子吸收光谱法测定生物样品中微量铬[J].理化检验-化学分册, 2008,44(4):361-363.
【14】张换平,杜慧,王书红,等.悬浮液进样-石墨炉原子吸收光谱法测定中药中铜和铅的溶出率[J].理化检验-化学分册, 2018,54(3):360-362.
【15】周陶鸿,林津,彭青枝,等.悬浮液进样石墨炉原子吸收光谱法测定乳粉中痕量铬[J].食品安全质量检测学报, 2015,6(4):1478-1482.
【16】GB 5009.12-2017食品安全国家标准食品中铅的测定[S].
【17】GB 5009.15-2014食品安全国家标准食品中镉的测定[S].
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