采用电感耦合等离子体原子发射光谱法测定了枸杞中锌、铅、锰、铁、铬、镁、钙、铜、钠、钾和镉11种元素含量.选择硝酸(2+98)溶液作为介质,选择波长为213.86,220.35,257.61,259.94,267.72,279.08,324.75,317.93,589.59,766.49,226.50 nm 11条谱线依次作为测定锌、铅、锰、铁、铬、镁、钙、铜、钠、钾和镉的分析线,测得11种元素的检出限(3δ)均低于0.07 mg·L-1,相对标准偏差(n=11)在0.72%~2.40%之间.比较了常规湿法消化法、高压消化罐法和微波消解法处理样品对测定结果的影响.研究表明,高压消化罐法和微波消解处理样品精密度好.

An ICP-AES method for the determination of Zn,Pb,Mn,Fe,Cr,Mg,Ca,Cu,Na,K and Cd in medlar was proposed.The HNO3 (2+98) solution was chosen as acid medium,and spectral lines with wavelengths of 213.86,220.35,257.61,259.94,267.72,279.08,324.75,317.93,589.59,766.49 and 226.50 nm were selected as analytical lines for the determination of Zn,Pb,Mn,Fe,Cr,Mg,Ca,Cu,Na,K and Cd respectively.Detection limits (3δ) for the 11 elements found were less than 0.07 mg·L-1,and values of RSD′s (n=11) were in the range of 0.72%-2.40%.The samples were treated by 3 different methods,including wet digestion method,pressurized digestion in a closed teflon vessel and microwave assisted sample digestion method.It was found that precision of analytical results obtained by the latter 2 methods were better than those obtained by the first one.