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不鏽鋼杯子泡茶,危害健康嗎? Brewing Tea With Stainless Steel Mug – Is It Harmless To Our Health?

Posted by CRM . on

茶湯會腐蝕不锈钢杯子,溶出“鉻”危害人體健康嗎?這應該是很多使用保溫品裝飲料的上班族非常關注的問題。形形色色的不鏽鋼產品出現在我們的生活當中扮演著不同的角色,但它並非“金剛不壞之身”,某些情況下,它是會被腐蝕的。所謂“不鏽”是指相對沒那麼容易生鏽。當然,各種產品也定會有品質上的落差。

如何挑選不銹鋼製品?

首先,看材料,首選“304鋼”製成的器皿,它是鉻遷移量較少的一種。或者查看不鏽鋼製品上印有的編號,選擇“18-8”。(前面數字表示鉻的含量,後面的表示鎳的含量。鎳的含量提高,其耐腐蝕性也隨之提高)

其實,在正常的情況下,使用符合國家標準的不鏽鋼製品,其鉻的析出量是極少的,並不需要擔心它影響人體健康。

參考資料:

“茶水只有非常微弱的酸性(茶水的pH根據種類和濃度各不相同,通常在5-7之間),對不鏽鋼的腐蝕作用也要小得多。假設用pH為5.5的茶水來做這樣的浸泡實驗,要想遷出0.4毫克的鉻,大約需要246個小時,也就是連續浸泡10天,這還得是在保證不鏽鋼表面沒有鈍化膜存在、反應一直發生的前提下才能達到。在實際情況中,茶水不會在不鏽鋼杯裏沸騰30分鐘,再考慮上鈍化膜的因素,實際反應速度會更慢。因此,只要你使用的不鏽鋼杯子是符合標準的產品,一杯茶別放太久(如果真把茶水放上好幾天,發黴變質恐怕才是首先需要擔心的問題),就不用擔心遷移出的鉻元素超標了。(轉載自http://www.guokr.com/article/439534/)”

Brewing Tea With Stainless Steel Mug – Is It Harmless To Our Health?

Does tea erode stainless steel mug and bring out chromium which is harmful to human health? This is a concern of office workers, who use insulated hydration bottle. Various stainless steel products have different functions in our daily life. But they are not necessarily undamageable. The wording 'stainless' means that it is relatively difficult to become rusty. Various products varied in their quality standard. This is for sure.

How to pick a stainless steel product?

Materials are the first criteria. Containers made of stainless steel grade 304 should be the first choice, for it comes with lower degree of chromium. Check the serial number printed on the stainless steel product, and opt for 18-8. The first figure indicates the level of chromium, and the second figure after the hyphen, nickel. More nickel indicates higher anti-rustiness.

Generally speaking, stainless steel products adhered to national standard actually release very minimal level of chromium. And we need not worry if it is harmful to our health.

Reference

Tea has very minimal acidity. Varied among the tea varieties and thickness of the tea, pH level of tea usually fluctuates between 5 to 7. Such low acidity means much lower erosion of stainless steel products.

Take a type of tea of pH 5.5 level for experiment. For the tea to soak in stainless steel mug and extract 0.4 milligramme of chromium, it would need approximately 246 hours. Which means continual soaking for ten days. And one has to make sure there is no passivation layer on the stainless steel product's surface. Also, the reaction has to be ongoing, before the soaking mug could bring out chromium.

Under normal condition, tea does not remain boiling temperature in stainless steel mug for 30 minutes. If we factor in passivation layer, the actual reaction is actually slower. Therefore, as long as we are using a stainless steel mug which is up to standard, and we are not keeping the tea for too long, we should not worry about excessive level of chromium. In fact, if we leave the tea in the stainless steel mug for several days, we should first worry about the mouldy and spoiled tea.

Health Tea Tips 保健

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