微波消解-原子荧光光谱法测定海洋生物体中汞

AFS Determination of Mercury in Halobionts with Microwave Assisted Sample Digestion

应用原子荧光光谱法测定海洋生物体中汞的含量。试样用盐酸、硝酸和过氧化氢混合溶液在微波消解仪中消解处理,经试验选定消解程序为:①消解功率1 600 W;②5min升温至120℃,保持5min;③5min升温至160℃,保持10min。分析时仪器工作条件为负高压260V,灯电流为40mA,载气流量为800mL.min-1。汞的质量浓度在0.80μg.L-1以内与相应的荧光强度呈线性关系,方法检出限(3s/k)为0.002mg.kg-1。方法用于测定海洋生物体中汞的含量,测定值的相对标准偏差(n=6)在2.7%～6.0%之间,加标回收率在90%～104%之间。

AFS was applied to the determination of mercury in halobionts.The sample was digested in a microwave sample digestor under the optimized conditions of： ① using power of 1 600 W for digestion;② raising the digestion temperature to 120 ℃ in 5 min and keeping at this temperature for 5 min;③ raising the temperature to 160 ℃ in 5 min and keeping for 10 min.In AFS analysis,negative high-voltage of 260 V,lamp current of 40 mA and flow-rate for carrier gas of 800 mL·min-1 were taken.Linear relationship between values of fluorescence intensity and mass concentration of mercury was obtained in the range within 0.80 μg·L-1,with detection limit（3s/k） of 0.002 mg·kg-1.The proposed method was applied to the determination of mercury in samples of halobionts,giving values of RSD（n=6） and recovery in the ranges of 2.7%-6.0% and 90%-104% respectively.