悬浮液进样-石墨炉原子吸收法快速测定植物样品中的铅和镉
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摘要
目的建立植物样品中铅和镉的悬浮液直接进样-石墨炉原子吸收测定方法。方法将植物样品制备成悬浮液,直接进样石墨炉原子吸收测定。结果本法Cd的线性范围为1.0~5.0μg/L,相关系数为0.9996,对1.0μg/L的Cd溶液进行5次测定,RSD为0.823%,Cd的方法检出限为0.003 mg/kg,特征浓度为1.3 pg/0.0044 A-s;Pb的线性范围为10~50μg/L,相关系数为0.9990,对10μg/L的Pb溶液进行5次测定,RSD为0.645%,Pb的方法检出限为0.0045mg/kg,特征浓度为30 pg/0.0044 A-s。对标准物质GBW10013黄豆和GBW10015菠菜进行检测,测定值在推荐值范围内。结论该方法具有前处理快速、简便,测定准确性好、检出限低等优点,适用于植物样品中铅、镉含量的测定。
Objective A method for the determination of lead and cadmium in plant samples by GFAAS with direct sampling of suspended solids was established. Methods Plant samples were prepared as suspended solids and were directly determined by the graphite furnace atomic absorption spectrometry, without complicated sample preparation. Results The linear range of Cd is 1 μg/l to 5 μg/l and the correlation coefficient is 0.9996. Five determinations of 1 μg/l of Cd solution gave RSD of0.823%. The LOQ of Cd was 0.003 mg/kg and the characteristic concentration was 1.3 pg/0.0044 A-s. The linear range of Pb is 10 μg/l to 50 μg/l and the correlation coefficient is 0.9990. Five determinations of 10 μg/l of Pb solution gave RSD of0.823%. The LOQ of Pb was 0.0045 mg/kg and the characteristic concentration was 30 pg/0.0044 A-s. The standard substance GBW10013 soybeans and GBW10015 spinach for testing and the measured value was within the recommended range. Conclusion This method is suitable for the determination of plant samples, with the advantages of fast and simple pretreatment, good accuracy and low detection limit.
Objective A method for the determination of lead and cadmium in plant samples by GFAAS with direct sampling of suspended solids was established. Methods Plant samples were prepared as suspended solids and were directly determined by the graphite furnace atomic absorption spectrometry, without complicated sample preparation. Results The linear range of Cd is 1 μg/l to 5 μg/l and the correlation coefficient is 0.9996. Five determinations of 1 μg/l of Cd solution gave RSD of0.823%. The LOQ of Cd was 0.003 mg/kg and the characteristic concentration was 1.3 pg/0.0044 A-s. The linear range of Pb is 10 μg/l to 50 μg/l and the correlation coefficient is 0.9990. Five determinations of 10 μg/l of Pb solution gave RSD of0.823%. The LOQ of Pb was 0.0045 mg/kg and the characteristic concentration was 30 pg/0.0044 A-s. The standard substance GBW10013 soybeans and GBW10015 spinach for testing and the measured value was within the recommended range. Conclusion This method is suitable for the determination of plant samples, with the advantages of fast and simple pretreatment, good accuracy and low detection limit.
引文
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[8]卜泽明,谢梅冬,吴礼洁,等.微波消解-ICP-MS法测定畜禽产品中铅、镉的含量[J].广西农学报,2015,30(4):54-56.
[9]Cava-Montesinos P,Cervera ML,Pastor A,et al.Room temperature acid sonication ICP-MS multielemental analysis of milk[J].Analytica Chimica Acta,2005,531(1):111-123.
[10]Wang Z,Qiu D,Ni ZM,et al.Direct determination of impurities in high purity Silicon carbide by inductively coupled plasma optical emission spectrometry using slurry nebulization technique[J].Analytica Chimica Acta,2006,577(2):288-294.
[11]中华人民共和国国家卫生和计划生育委员会.GB 2762-2017食品安全国家标准食品中污染物限量[S].2017,北京:中国标准出版社,2017.
[2]蔡文华,胡曙光,苏祖俭,等.2007~2014广东省膳食中铅、镉、砷、汞元素的人群健康风险评估[J].食品安全质量检测学报,2015,6(6):2308-2316.
[3]Ngidlo RT.Impacts of pesticides and fertilizers on soil,tail water and groundwater in three vegetable producing areas in the Cordillera region,northern Philippines[J].American Journal of Experimental Agriculture,2010,3(4):780-793.
[4]Gomah HH,Ezzeldin HA,Ahmed MMM.Evaluating levels of certain heavy metals in some fertilizers and pesticides[J/OL].[2018-05-09].http://agris.fao.org/agris-search/search.do?record ID=EG2005001001.
[5]李映瑞.微波消解-火焰原子吸收法测定市售奶茶中的铜锌钙铁锰[J].海峡预防医学杂志,2017,23(3):51-53.
[6]谢彩玲,熊文明,黄勇,等.正交试验法优化超声辅助提取茶叶中的茶多酚[J].广东化工,2017,44(11):113-114.
[7]范博伦,马真真,田欢,等.密闭消解-氢化物发生-原子荧光光谱法测定植物中硒[J].理化检验:化学分册,2017,53(8):905-907.
[8]卜泽明,谢梅冬,吴礼洁,等.微波消解-ICP-MS法测定畜禽产品中铅、镉的含量[J].广西农学报,2015,30(4):54-56.
[9]Cava-Montesinos P,Cervera ML,Pastor A,et al.Room temperature acid sonication ICP-MS multielemental analysis of milk[J].Analytica Chimica Acta,2005,531(1):111-123.
[10]Wang Z,Qiu D,Ni ZM,et al.Direct determination of impurities in high purity Silicon carbide by inductively coupled plasma optical emission spectrometry using slurry nebulization technique[J].Analytica Chimica Acta,2006,577(2):288-294.
[11]中华人民共和国国家卫生和计划生育委员会.GB 2762-2017食品安全国家标准食品中污染物限量[S].2017,北京:中国标准出版社,2017.