澳洲坚果果仁中4种关键微量元素的FAAS法测定

为探明澳洲坚果果仁中Fe、Mn、Cu、Zn 4种关键微量元素的含量及其测定方法，运用火焰原子吸收分光光度法(FAAS)，采用干灰化、混酸消解、微波消解3种不同样品消解方式，对4个澳洲坚果品种果仁中Fe、Mn、Cu、Zn的含量进行了测定。结果表明：Fe、Cu经3种不同消化方式处理后的含量测定结果无显著差异；而Mn、Zn经微波消解处理后的测定值虽然略高于干灰化和混酸消解2种方式，但未达到显著水平；澳洲坚果果仁中4种微量元素的含量为Mn>Fe>Zn>Cu，其中Mn元素含量在品种间的变异较大；在4个供试品种中，‘云澳51号’的Fe含量为最高，而‘云澳58号’的Mn、Cu、Zn 3种微量元素含量均为最高。3种样品消解方式均可用于澳洲坚果果仁微量元素含量的FAAS法测定。

Determination of Four Trace Elements in Macadamia Kernel by Flame Atomic Absorption Spectrometry

In order to investigate the determination method and content of iron,manganese,copper and zinc in the kernel of macadamia,the content of four trace elements in the kernel of four macadamia cultivars were determined by flames atomic absorption spectrometry（FAAS）,the sample were decomposed by three ways include dry ashing,acid digestion,microwave digestion,the content of each trace element in different macadamia cultivars were compared.The results showed that the content of iron and copper determined by three decomposition ways had no significant differences,but the content of manganese and zinc which determined by microwave digestion were slightly higher than the other two decomposition ways,but the differences were not significant.The average content were MnFeZnCu in the kernel of macadamia,the content of manganese showed a significant difference among cultivars.The iron content of‘YunMac 51＇was the highest and‘YunMac 58＇had the highest content of manganese,copper and zinc.All the three decomposition ways could be used for trace element determination of macadamia kernel by FAAS.