07/02/2026
你有冇諗過平時食嘢，會食咗幾多水銀落肚呢🤔？
之前講到，其實食物入面有水銀㗎！為咗俾大家知道食物入面有幾多水銀，我哋喺香港中文大學唔同飯堂收集咗好多樣本，然後喺呢個post公開！
其實食物入面有幾多水銀，好視乎食物本身係喺食物鏈嘅邊個營養級。基本上，越低營養級嘅食物，水銀含量就越低，反之亦然。碳水化合物類🍞🍚同埋蔬果類🥬🍅一般都係植物，正正就係呢個原因，所以含有好少水銀，大家可以放心食用。而肉類食物🥩主要都係陸生動物，佢哋主要係食水銀濃度低嘅植物，所以同樣只有好少水銀，同樣可以放心食用。
不過，鍾意食海鮮🦀🦐嘅朋友就要留意啦⚠️！之前講過，水銀喺水入面缺氧嘅環境會甲基化成為更加毒嘅甲基汞，而甲基汞係好容易進入食物鏈同埋喺水生動物體內累積，再加上生物放大作用，就令到海鮮類食物嘅水銀濃度都比其他類別高！
至於想知道一個完整嘅飯餸一共含有幾多水銀，就密切留意我哋下一個post啦！
Have you ever thought about how much mercury you are taking in 🤔?
As mentioned in previous posts, there is indeed mercury in food! To help everyone know how much mercury is present in different food, we have collected lots of food samples in the canteens across the CUHK campus.
The mercury concentration in food largely depends on the trophic level it occupies in the food chain. Generally, the lower trophic level the food sits in, the lower its mercury level, and vice versa. Carbohydrates 🍞🍚 and vegetables 🥬🍅 are mainly plant-based food, which is why they contain very low mercury concentration and are safe for us to be consumed. For meats 🥩, they are mainly terrestrial animals, which they mainly feed on plants with low mercury concentration. Therefore, meats also contain very little mercury, and they are similarly safe to consume.
Yet, seafood lover 🦐🦀 should pay attention ⚠️! Mercury will be methylated into methylmercury (MeHg) in the anoxic environment in water, which is even more toxic. MeHg can enter the aquatic food chain and accumulate in aquatic animals easily. Together with biomagnification, this results in a much higher mercury concentration in seafood than other food categories.
If you want to know the amount of mercury in a dish, stay tuned for our next post!
pollution foodsafety seafood health carbohydrates vegetables fungi meats foodchain
![[English version in comments]上次嘅帖文就講咗唔同食物嘅水銀濃度。為咗俾大家知道食完一餐飯會一共食咗幾多水銀落肚，我哋喺香港中文大學兩間飯堂分別買咗叉燒油雞飯同埋6吋吞拿魚潛艇堡，並量度佢哋嘅總水銀含量。點解知道...](https://img4.unis10.com/257/064/122206659032570646.jpg)
