以高壓處理法前處理之重金屬分析方法探討

DETERMINATION OF HEAVY METAL BY HIGHT PRESSURE BOMB DIGCSTION METHOD FOR PRETREATMENT

食品檢體中重金屬元素的分析，一般均需經過分解，消化成水溶液，再利用各種儀器方法作目的元素之測定。常採用的分解方法有乾式灰化法及濕式消化法，其中屬於後者之一的高壓分解法是在高壓高溫下，使密閉於鐵氟龍容器中之試樣，在少量酸劑和氧化劑之作用下，達到分解目的，兼具快速、簡單特性，不會造成汞及砷等元素之逸失，且會降低由試藥及容器所導入的背景值，符合微量分析的要求。因此，本計畫擬用高壓分解法消化食品檢體，再分別以離子耦合感應電漿（ICP-AES）測定食品中鉛、銅和鎘含量；以氫做原子吸光分光光譜儀（HAAS）測定食品中汞和砷含量。

The pretreatment of food by high pressure bomb digestion method for heavy metal analysis was studied. The amount of cadmium, copper and lead were deter mined by Inductively Coupled Plasma Atantic Emission Sepetrophotometry (ICP-AES), while mercury are arsenic were determined by Atomic Absorption Spectrophotometry. The recoveries of lead, copper, cadmium, mercury and arsenic added to Hour and swine liver samples were 87-114%, the detection limit of heavy metals which mentioned above were 101 ppb, 3.39ppb, 5.91 ppb, 30ng and 20ng respectively, This method was most saitable for copper analysis.