论文部分内容阅读
目的建立食品中Cr(Ⅵ)的测定方法。方法以10%的盐酸作为浸提液,样品通过微波120℃浸提15 min,提取液经Waters MAX小柱(500 mg,6 cc)分离后用5%氨水淋洗,然后将淋洗液定容,经石墨炉原子吸收法间接测量Cr(Ⅵ)含量。结果该方法在1~10μg/L的线性范围内具有良好的线性关系,r>0.999,方法检出限为0.008 7 mg/kg,回收率均在90.24%~108.06%之间,RSD为3.19%~6.01%。结论该方法简便、快速、灵敏和准确,适合蔬菜、水果、谷物以及保健食品中Cr(Ⅵ)的检测。
Objective To establish a method for determination of Cr (Ⅵ) in food. Methods 10% hydrochloric acid was used as the extract, and the sample was extracted by microwave at 120 ℃ for 15 min. The extract was separated by Waters MAX cartridge (500 mg, 6 cc) and eluted with 5% aqueous ammonia. The eluent was then eluted The Cr (Ⅵ) content was measured indirectly by graphite furnace atomic absorption spectrometry. Results The method showed good linearity in the range of 1 ~ 10μg / L with r> 0.999, the detection limit was 0.008 7 mg / kg, the recoveries were between 90.24% and 108.06%, and the RSD was 3.19% ~ 6.01%. Conclusion The method is simple, rapid, sensitive and accurate and suitable for the determination of Cr (Ⅵ) in vegetables, fruits, cereals and health foods.