淘米水洗菜竟不如清水?权威测试结果公布,这样洗菜才最好|欧美丰满熟妇xxxx性

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2. eighteen-year-olds are not mature enough to vote

  很多人喜欢用“淘米水”洗蔬菜,认为可以更好地去除残留农药。事实上果真如此吗?近日,上海市消保委联合农产品专家和上海市食品工业研究所做了一次“蔬菜清洗测试”,结果发现当农药残留量较高时,淘米水去农残的效果反倒不如清水好。

  超四成消费者用淘米水洗菜

  蔬菜农药残留一直是消费者很关心的问题。上海农产品合格率全国领先,今年一季度和二季度,上海食用农产品监督抽检合格率分别为96.36%和96.74%。

  尽管如此,多数消费者还是觉得买回家的菜要多洗几遍才安心。在众多“洗菜小妙招”中,用淘米水当作“天然清洁帮手”的做法很常见。消保委调查显示,有超四成的消费者会用淘米水浸泡蔬菜后冲洗。

  淘米水真的有效?为了搞清这个问题,消保委在测试前期做了大量的调研和准备工作。首先,确定以餐桌上的“常客”大棚青菜作为测试对象;其次,专门在崇明上实蔬菜园模拟青菜田间种植生长真实环境,在青菜生长时喷洒甲氨基阿维菌素苯甲酸盐(防治菜青虫、夜蛾)和啶虫脒(防治跳甲、蚜虫)这两种常见的复合型农药;最后,在安全间隔期3天后进行采摘,制成含有农药残留的阳性青菜样本。

  淘米水效果不如清水好

  测试中,工作人员分别用清水和淘米水浸泡青菜5分钟,然后冲洗0.5分钟,用这种方式重复处理样本,多次测试和对比两种农药的去除效果。

  测试发现,两种“浸泡+冲洗”的清洗方式,去农残的效果都很不错。当青菜中农药残留量浓度较低时,不管是淘米水还是清水,都能完全去除农残。

  但出乎意料的是,当青菜中农药残留量较高时,淘米水对农药的去除率为60.3%,而看似“平平无奇”的清水对农药的去除率却优于淘米水,达到63.6%。如果清水浸泡时间更久一些,去除效果还能持续提升。

  淀粉会阻碍水分充分浸泡

  淘米水居然“败下阵来”,为什么老人教的方法不灵了?专家解释,淘米水去农残的原理,本质上还是依靠“浸泡”和“冲洗”的物理作用,“浸泡”帮助水渗透到蔬菜表面及浅表层,溶解、扩散部分农药,“冲洗”则将溶解的农药带走。

  大家误以为淘米水中的淀粉能吸附农残,但实际上,淀粉粘性反而可能会黏附在蔬菜叶面,阻碍水分充分浸泡蔬菜,影响农残去除效果。

  相比之下,清水来源广泛、取用方便,还不会带来二次污染。用清水浸泡5到30分钟,再冲洗半分钟,就能简单、高效去除农残。因此,今后在清洗青菜等绿叶蔬菜时,可以不用执着于淘米水。

  来源:上观新闻

  作者:新民晚报 金旻矣

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发布于:北京市