原子吸收分光光度法测定资丘木瓜中3种重金属含量

Measurement of Three Heavy Metal Elements by Atomic Absorption Spectroscopy in Fruits of Chaenomeles Speciosa

建立了测定资丘木瓜药材中铜、铅和镉三种重金属含量的方法：采用火焰原子吸收光谱法检测铜的含量，以石墨炉原子吸收光谱法检测铅和镉的含量．3种重金属测定的检测限为0．0006μg/mL、0．0030ng/mL、0．0024 ng/mL，相对标准偏差（RSD）为2．7％、2．9％、1．2％，回收率为100％～105％，线性相关系数为0．999和0．992、0．995，均符合要求．经测定3批资丘木瓜药材中铜、铅、镉的含量分别为13．53～16．24 mg/kg、0．0163～0．0232 mg/kg、0．2267～0．3364 mg/kg，结果表明：3批木瓜样品中重金属的含量均符合《药用植物及制剂进出口绿色行业标准》中有关重金属标准的规定．

To establish a method for the measurement of three kinds of heavy metal elements Cu , Pb and Cd in fruits of Chaenomeles Speciosa.Flame atomic absorption spectroscopy （ FAAS） was used for the determination of Cu and graphite furnace atomic absorption spectroscopy （ GFAAS） was used for Pb and Cd .The limit of detection of Cu , Pb and Cd as 0.0006μg/mL, 0.0030ng/mL and 0.0024 ng/mL respectively and RSD of Cu , Pb and Cd as 2.7%,2.9% and 1.2%respectively .The coefficient of recovery of 3 heavy metals as in the range of 100%~105%.They were all conformed to the requirements.The contents of Cu, Pb and Cd in fruits of Chaenomeles Speciosa were 13.53-16.24 mg/kg（r=0.999）, 0.0163-0.0232 mg/kg（r=0.995） and 0.2267-0.3364 mg/kg（r=0.992）.The heavy metal contents in 3 batches of fruits of Chaenomeles Speciosa were conformed to the national standard of Green Trade Standards of Importing ＆ Exporting Medicinal Plants ＆ Preparations .