直接测定菜油、精制油和氢化油中砷的温等平台石墨炉原子吸收分光光度法

DIRECT DETERMINATION As IN RAPESEED OIL,REFINE OIL AND HYDRIDE OIL BY STPF-GFAAS

石墨炉原子吸收分光光度法(GFAAS)测定砷较为困难,直接测定有机材料中砷的文献更为少见。Elson等曾试图用GFAAS直接测定MIBK溶解的精制油,最终认为即使加入Ni^(2+)也无法进行测定。Fabec用Ni^(3+)作基体改进剂,由GF-AAS直接测定了四氢呋喃溶解的页岩油中的砷。由于该法必须将样品稀释100倍以上,其检出限量仅为0.2mg/kg,不能适合食品卫生标准对植物油中砷限量应≤0.1mg/kg的要求。本文比较了管壁法和平台法,以及Pd^(2+)

Solution of 260μl 1% Pd^(2+) or 200μl 10% can be dissolved in 10ml MIBK. Solution which contains 1.6ml anhydrous ethanol, 2.0g oil and 1.00μl As^(3+). We compared the effect of Pd^(2+) to determine As with the effecf of Ni^(2+) to determine As in Oil. We also compare the effect of signal of As^(3+) and triphenylarsine using furnace with the effect of signal of As^(3+) and triphenylarsine using plateform in standard solution and oil.