非完全消化-悬浮液进样-火焰原子吸收光谱法测定海产品中微量元素

将海产品样品烘干、粉碎、过筛，在加热条件下用浓硝酸消解样品，使绝大部分样品组分(95% 以上)被分解或转入溶液中，再加入乳化剂OP，最后将其悬浮在琼脂溶液中制成非完全消化悬浮液，用La2O3 作为释放剂以消除测钙时的化学干扰。用原子吸收光谱法成功测定了虾、螃蟹和鲳鱼中的钙、锌、铜微量元素，测定结果的相对标准偏差小于等于3.0%。从而证明采用非完全消化- 悬浮液进样- 火焰原子吸收光谱法测定海产品中微量元素是可行的。此方法简便、快速、准确。

Determination of Trace Elements in Seafood by Non-complete Digestion-Suspension Sampling-Flame Atomic Absorption Spectrometry

After dried, crushed and sieved, sea food samples (such as shrimps, crabs and pomfrets) were digested with concentrated nitric acid under heating condition until the solution became transparent. The digestion solution was mixed with emulsifier OP, and then suspended in 1.5 g/L agar solution. Finally, non-complete digested suspension was obtained to determine calcium, zinc and copper in these see food samples by flame atomic absorption spectrometry (FAAS). La2O3 was used as releasing agent to eliminate chemical interference to calcium determination. The relative standard deviations of determination were less than 3.0%. The non-complete digestion method-suspension sampling-flame atomic absorption spectrometry technique proved to be feasible for determining trace elements in seafood samples. This method is simple, fast and accurate.