电感耦合等离子体-质谱法测定食用藻类植物中的碘含量

建立测定海带、裙带菜、发菜、海苔、紫菜、石莼等食用藻类植物中碘含量的电感耦合等离子体-质谱法(ICP-MS)。样品用质量分数25%四甲基氢氧化铵(TMAH)溶液在密闭玻璃瓶中于90℃条件下提取3h，取上清液稀释上机，以碲作为内标，经ICP-MS测定。方法的线性范围为10～500μg/L，相关系数为r=0.9999。对裙带菜做添加回收实验，回收率在80%～120%之间，RSD小于5%，方法检出限为0.50mg/kg。本方法操作简单、灵敏度高、快速，适用于食用藻类植物中碘含量的批量化检测。

Determination of Iodine Content in Edible Algae by Inductively Coupled Plasma-Mass Spectrometry

A simple method employing inductively coupled plasma mass spectrometry (ICP-MS) for the determination of iodine content in edible algae such as kelp, undaria, hair algae, sea aedge, laver and ulva lactuca was developed. Samples were extracted by 25% tetramethylammonium hydroxide (TAMH) in closed glass bottles at 90 ℃ for 3 hours. The supernatant were diluted and determined by ICP-MS with Te as internal standard. This method displayed excellent linearity in the linear range from 10 to 500μg/L with a correlation coefficient of 0.9999. The mean recoveries in undaria samples ranged from 80% to 120% with a RSD of less than 5%, and the limit of detection for iodine was 0.50 mg/kg. This simple, rapid and sensitive method is applicable for the determination of iodine in massive samples.