台灣東部地區市售柑橘類水果及其果汁中二、四地之殘留量   全文下載

Levels of 2,4-D Residues in Marketed Citrus Fruits and Juices Collected from Eastern Taiwan Area

本調查首先針對台灣東部地區市售柑橘類水果及其果汁中二、四地（2,4-D）殘留量之檢驗作探討，發現柑橘類水果取20g，添加1N硫酸5ml後，以丙酮萃取濃縮，再以二氯甲烷萃取濃縮；果汁則取100g添加1N硫酸5ml，食鹽10g後，以醋酸乙酯萃取濃縮。上述濃縮液再以甲醇定容行衍生化，可節省濃縮之時間及免除淨化之過程，最後以氣相層析儀分析定量。柑橘類水果檢體中添加1.0、2.0及4.0 μg／g之二、四地或果汁檢體中添加0.20、0.40及0.80 μg／g之二、四地時，其回收率分別為柑橘類水果88.2-92.3%，果汁90.3-94.5%，變異係數皆小於10%。本方法對柑橘類水果的最低檢出量為0.10 μg／g，柑橘類果汁為0.02 μg／g。依此方法抽驗市售柑橘類水果及其果汁中二、四地農藥之殘留情形，於八十三年度自宜蘭、花蓮、臺東三縣市抽購葡萄柚25件、柳丁25件，檢驗結果均未檢出（≦0.10 μg／g）。檸檬20件中雖有2件之殘留量為0.28與0.42ppm，但均仍未超過衛生署公告之殘留農藥安全容許量標準2ppm。至於葡萄柚汁15件、柳橙汁15件及檸檬汁15件，則均未檢出（≦0.02 μg／g）。顯示市售柑橘類水果及其果汁均無超量之二、四地農藥殘留。"

An assay method for 2,4-D residues in citrus fruits and juices was developed to evaluate the levels in marketed products collected from the eastern Taiwan area. The method was modified slightly from the standard method established by Department of Health, R.O.C .. Citrus samples were extracted with solvents, which was removed by evaporation with a rotary evaporator under reduced pressure. The concentration of 2,4-D residue was then quantified with GC after methylation in the presence of sulfuric acid. A total of 25 grapefruits and 15 grapefruit juices, 25 citrus and 15 citrus juices, and 20 lemons and 15 lemon juices were sampled and analysed. Among all the samples analysed only two lemon samples were detected to have low level of 2,4-D residues (0.28 and 0.42 ppm). No significant amout of 2,4-D residues was found in all other samples.