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每年5月至10月都是小龙虾当造的时节，传媒近日揭发广州的水产市场内有不法商贩利用洁厕液主要成份的草酸，来清洗小龙虾，而业者更称之为“洗虾粉”。专家指出，草酸含有一定毒性，对人体危害极大，有可能会破坏人体免疫系统。

媒体日前在广州的水产市场内发现有商贩用一种“神秘物质”，能瞬间把小龙虾洗干净。媒体随后在市场内购买了一盘未经清洗的小龙虾进行实测，发现浸泡过小龙虾的清水，会变得肮脏腥臭，流出大量杂碎，但只要把小龙虾放到“神秘物质”，清洗后的小龙虾会变得比用清水浸泡的更为干净。

然而，经检测，该种“神秘物质”竟是草酸。草酸是明令禁止作为食品添加剂，一般只用于清洁洗手间、坐厕、洗手盆等地方。

专家更指出，草酸含有一定毒性，过度吸入对人体损害极大，不但会破坏人体免疫系统、消化系统，严重更可致命。

早前在陕西西安的水产市场，就曾揭发有商贩在凌晨时分偷偷使用“洗虾粉”，且有被草酸洗过的小龙虾，流入当地海鲜店出售。专家提醒，顾客购买小龙虾后，应先用清水浸泡一段时间，可有效减少草酸残留。