微波消解-石墨炉原子吸收分光光度法测定胶囊中总铬

Determination of total Cr in capsules by microwave digestion-GFAAS

为了改进胶囊中铬含量测定方法,采用微波消解-石墨炉原子吸收分光光度法,以2%Na2SO4为基体改进剂测定胶囊中总铬.结果表明：Cr离子的线性范围0～50ng/mL（r=0.998）;加标回收率为95.7%～108.2%,检出限0.15ng/mL.该方法准确、可靠,重复性良好,可用于胶囊中铬离子含量的测定.

Objective：establish a content determination method for total chromium（Cr）in capsules. Methods：a microwavedigestion-graphite furnace atomic absorption spectrometry（GFAAS）is used to determine total chromium in capsules with 2%Na2SO4solution as matrix modifier. Experiment results：the linear range of Cr ion is from 0ng/mLto 50ng/mL（r=0.998）;the recoveryrate with added specimen ranges from 95.7%to 108.2%,the minimum of detectability is 0.15ng/mL. Conclusion：the method isaccurate and reliable with high repeatability and is suitable for determination of Cr ion in capsules.