市售水產品汞含量調查分析

Determination of Mercury Contents in Fishery Products on Local Market

賴文正(Wen-Jen Lai) ； 駱錫能(Shyi-Neng Lou)

《宜蘭大學生物資源學刊》 15卷 (2019/12) Pp. 105-123

https://doi.org/10.6175/job.201912_15.0009

摘要

本研究調查分析市售水產品的汞含量並進行分類比較。實驗以油魚和鱰魚執行方法確效，精密度的變異係數均在6.3%以下，回收率則在95.2－95.9%之間，進一步以兩種標準參考物質（DORM-4及BCR-463）進行準確度驗證，回收率亦高達96.8%以上，顯示本方法之良好適用性。而以油魚為例，方法的最低偵測極限與定量極限則分別為0.39 ppb及1.30 ppb。以建立之汞含量分析方法，檢測市售23種水產品，共計211件樣品，結果顯示屬迴游性大型魚類的水鯊、油魚、旗魚等平均含汞量分別為0.647 ppm、0.619 ppm和0.556 ppm，屬NRDC規範之最高汞含量魚類；而鮪魚及鱰魚的汞含量較低，分別為0.204 ppm及0.126 ppm。其餘中小型品種的魚類及淡水養殖魚類的汞含量則分別為0.084 ppm和0.014 ppm，屬NRDC規範之低汞含量魚類。另外，魚鬆、魚罐頭及魚卵製品等加工製品中，汞含量分佈分別為0.05～5.45 ppm、0.028～0.079 ppm和0.002～0.008 ppm，以魚鬆的汞含量為最高，魚鬆原料又可區分為旗魚鬆、鮪魚鬆、鮭魚鬆和未標示魚種之魚鬆等，除了鮭魚鬆外，其餘各種魚鬆的平均汞含量均超過0.5 ppm。油魚和水鯊的甲基汞含量佔總汞含量的96.2和98.6%，而旗魚鬆的甲基汞含量僅佔19%，因此除了一件未標示原料魚種之魚鬆外，所檢測水產品的甲基汞含量均能符合我國現行之食品污染物的衛生標準。

關鍵字

水產品 ； 汞含量 ； 甲基汞含量 ； 方法確效

並列摘要

The purpose of this study is to investigate mercury content in fishery products on local market and compare the difference between various groups. The method validation was carried out with oilfish and mahi as matrix. The coefficient of variance in precision determination was under 6.3%, while the recovery was between 95.2-95.9%. Furthermore, two standard reference materials were used to certify the accuracy, which the recovery was above 96.8%. This showed that the method is suitable for mercury determination of fishery products. The limit of detection (LOD) and limit of quantification (LOQ) of oilfish, for instance, was 0.39 ppb and 1.30 ppb, respectively. The mercury contents of 23 kinds of fishery products, included 211 samples, were determined by the established analysis method. The results indicated that the average mercury content of blue shark, oilfish, and swordfish, which belongs to large migratory fishes, were 0.647 ppm、0.619 ppm and 0.556 ppm, respectively. These can be classified as fish of highest mercury level, since the contents is larger than 0.5 ppm. However, the mercury contents of tuna and mahi were lower in the category of large migratory fishes with value in 0.204 ppm and 0.126 ppm, respectively. The mercury contents of middle/small fish, in species, and freshwater cultured fish were 0.084 ppm and 0.014 ppm, respectively, which is belongs to fish of least mercury. On the other hand, the fish floss contained the highest mercury content (0.05~5.45 ppm) of fishery products, included canned fish (0.028~0.079 ppm) and fish roe products (0.002~0.008 ppm). The raw materials of fish floss, including swordfish, tuna, salmon, and unlabeled, could be found. The average mercury content of individual fish floss showed larger than 0.5 ppm, except salmon as raw material. The ratio of methylmercury to mercury was 96.2% for oilfish and 98.6% for blue shark. However, the ratio for fish floss, swordfish as material, was only 19%. Thus, except a fish floss (raw material unlabeled), it could be proposed that the content of methylmercury of fishery products in this study are in compliance with the regulatory standard of food contamination.)

並列關鍵字

fishery products ； mercury content ； methylmercury ； method validation