以石墨爐式原子吸收光譜儀直接測量酒中鉛、銅及鎘方法之探討   全文下載

Studies on a Method to Directly Determine Lead, Copper and Cadmium in Alcoholic Beverages Using a Graphite Furnace Atomic Absorption Spectrophotometer

本研究探討以石墨爐式原子吸收光譜儀直接測量酒中鉛、銅及鎘之含量。將檢體以0.5%硝酸溶液稀釋至酒精濃度5%以下，添加0.5%磷酸二氫鉀溶液為修飾劑，以偏極化玆曼石墨爐式原子吸收光譜儀直接測定其吸光度，由標準曲線計算其含量。偵測極限為鉛0.5ng/mL，銅0.5ng/mL及鎘0.05ng/mL。添加鉛10, 20, 30ng/mL, 銅10, 20, 30ng/mL及鎘1.0, 2.0, 3.0ng/mL於啤酒、葡萄酒及高梁酒中，鉛之回收率於啤酒為95.3~97.9%，於葡萄酒為94.2~99.1%，於高梁酒為95.l~98.9%；銅之回收率於啤酒為97.1~98.3%，於葡萄酒為97.4~99.5%，於高梁酒為97.5~99.1%；鎘之回收率於啤酒為98.1~99.5%，於葡萄酒為98.3~99.4%，於高梁酒為97.5~99.7%。以此法分析國產酒34件及進口酒45件，共計79件。國產酒檢出含鉛15件，平均含量23.41ng/mL，檢出範圍2.7~63.9ng/mL，進口酒檢出16件，平均含量13.02ng/mL，檢出範圍0.9~49.7ng/mL。國產酒檢出含銅23件，平均含量79.31ng/mL，檢出範圍5.3~503.0ng/mL，進口酒檢出41件，平均含量64.42ng/mL,檢出範圍2.9~445.0ng/mL。國產酒檢出含鎘4件，平均含量3.4ng/mL，檢出範圍2.5~5.0ng/mL，進口酒檢出9件，平均含量0.9ng/mL，檢出範圍0.2~2.3ng/mL。"

A quick, easy method for determination of lead, copper and cadmium in alcoholic beverage was developed. The method uses a polarized Zeeman graphite furnace atomic absorption spectrophotometer (GFAAS) and pyrolytic graphite tube. Ammonium dihydrogen phosphate was used as a matrix modifier. Alcoholic beverages were diluted to a concentration of less than 5% alcohol with 0.5% nitric acid and were analyzed directly. The estimated detection limits were 0.5 ng Pb/mL, 0.5 ng Cu/mL and 0.05 ng Cd/mL. Recovery studies were performed using beer, grape wine and kao liang liguor, fortified with 10, 20 and 30 ng Pb/mL, 10, 20 and 30 ng Cu/mL and 1.0, 2.0 and 3.0 ng Cd/mL, respectively. Recoveries of lead in beer were in the range of 95.3~97.9%, in grape wine were in the range of 94.2~99.1% and in kao liang liquor were in the range of 95.l~98.9%. Recoveries of copper in beer were in the range of 97.l~98.3%, in grape wine were in the range of 97.4~99.5% and in kao liang liquor were in the range of 97.5~99.l%. Recoveries of cadmium in beer were in the range of 98.1~99.5%, in grape wine were in the range of 98.3~99.4% and in kao liang liquor were in the range of 97.5~99.7%. Seventy-nine samples of alcoholic beverages were analyzed using GFAAS. Results showed that the contents of heavy metals in the domestic products were 2.7~63.9 ng Pb/mL (15 samples), 5.3~503.0 ng Cu/mL (23 samples) and 2.5~5.0 ng Cd/mL (4 samples). In the imported products, they were 0.9~49.7 ng Pb/mL (16 samples), 2.9~445.0 ng Cu/mL (4lsamples) and 0.2~2.3 ng Cd/mL (9 samples).