1公升水含24萬塑膠微粒!飲水前2步驟可去除90%微塑膠 減致癌不育風險
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要維持身體健康要多喝水,同時也要避免喝進有害物質,例如微塑膠,因可能增加患癌及不育等風險。曾有研究指出,樽裝水可含有24萬塑膠微粒。如何減低風險?今年2月一項研究發現,只須2個簡單步驟,就可清除飲用水中多達90%的微塑膠。
1公升水含24萬塑膠微粒!增致癌不育危機
甚麼是微塑膠?香港食安中心指出,微塑膠即是微細的塑膠,可能引致環境污染及危害海洋生態,甚至有機會進入食物鏈,被人體所攝取。早前美國有研究團隊曾發現樽裝水含有大量塑膠微粒,平均每公升水就有24萬粒,而且多達90%是納米塑膠微粒。團體警告,人體若吸收過量,可能有患癌及不育等風險。
微塑膠出現在哪些產品或食物?生蠔易藏微塑膠?食安中心講解如下:
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研究證實飲水前多做2步驟 可去除90%微塑膠
微塑膠除了存在於樽裝水當中,對自來水的污染亦日趨嚴重。2024年2月,廣州醫科大學及暨南大學的研究團隊在美國化學學會旗下的國際期刊《Environmental Science & Technology Letters》,發表了一項有關清除食水微塑膠的研究。研究團隊表示,納米塑膠及微塑膠(Nano/Microplastics, NMPs)對於供水系統的污染越來越普遍。這些膠粒的直徑大小可以由千分之一毫米至5毫米不等,雖然對人類健康的影響仍在調查中,但目前的研究已表明攝取它們可能會影響腸道微生物。
因此,他們希望可找到一般人在家裡就可以簡單地淨化飲用水的方法。結果發現,亞洲家庭最常見的處理食水的習慣,竟有助去除食水當中多達90%的微膠粒。
如何去除飲用水的微塑膠?研究內容及結果如下:
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研究發現,無論在軟水或硬水,同樣可產生將微塑膠包裹沉澱的效果,不過在越硬的水當中,效果越明顯:
- 每公升含有180mg碳酸鈣的硬水,可去除84%微塑膠。
- 每公升含有300mg碳酸鈣的硬水,可去除90%微塑膠。
- 每公升含有少於60mg碳酸鈣的軟水,可去除25%微塑膠。
因此,研究人員建議,只須將水煲滾後放涼,再以咖啡濾紙過濾,就有效去除飲用水當中的微膠粒,減少人體攝入。
微塑膠或含塑化劑 經常接觸增乳癌風險90%
人體攝入的微塑膠,當中若含有塑化劑,可能對健康產生危害。根據香港食安中心資料,塑化劑(又稱增塑劑)是用來加入硬塑料等物料中,使更具彈性和耐用,廣泛用於多種工業和消費產品,主要用於聚氯乙烯(PVC)產品,當中有些用於食物接觸物料。
由於塑化劑廣泛存在於環境中的污染物,我們無可避免會透過食物、水或皮膚與塑膠接觸等不同途徑攝入小量塑化劑。不過,人體可有效代謝和排出鄰苯二甲酸酯等塑化劑,攝入小量鄰苯二甲酸酯不會影響健康。
不過,台灣中研院於2014年發布一項的研究報告指出塑化劑與乳癌的關係。研究團隊追蹤11,923名女性達20年,證實經常接觸塑化劑產品、暴露於塑化劑的女性,患乳癌風險比一般人高90%。
食安中心教6招減少吸入塑化劑
食安中心列出6大建議,教大眾盡量減少從食物攝入塑化劑:
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