采用人工汗液萃取法处理样品,提出了石墨炉原子吸收光谱法同时测定羊剪绒制品中铅、铬和钴含量的方法。1.000 g样品用30 mL人工汗液于40 ℃萃取20 min,选择铅、铬和钴的灰化温度和原子化温度分别为650 ℃,1 000 ℃,1 200 ℃和1 500 ℃,2 300 ℃,2 100 ℃。在优化的试验条件下,铅、铬和钴的质量浓度分别在10.00~100.0 μg·L-1,20.00~100.0 μg·L-1,20.00~100.0 μg·L-1范围内与吸光度呈线性关系,方法的检出限(3S/N)分别为0.038,0.091,0.086 μg·L-1。方法可用于羊剪绒制品中铅、铬和钴含量的测定,回收率分别在95.5%~97.3%,93.9%~97.7%,98.5%~99.3%之间,测定值的相对标准偏差(n=5)均小于5.0%。

A new method for simultaneous determination of lead, chromium and cobalt in sheepskin products by GFAAS was proposed in this paper. The sample (1.000 g) was extracted at 40 ℃ with artificial sweat (30 mL) for 20 min. The temperatures of ashing and atomization were set respectively at 650 ℃ and 1 500 ℃ for lead, 1 000 ℃ and 2 300 ℃ for chromium, 1 200 ℃ and 2 100 ℃ for cobalt. Under the optimal experimental conditions, linear relationships between values of absorbance and mass concentration were kept in the ranges of 10.00-100.0 μg·L-1 for lead, 20.00-100.0 μg·L-1 for chromium and 20.00-100.0 μg·L-1 for cobalt, with detection limits (3S/N) of 0.038 , 0.091 and 0.086 μg·L-1 respectively. The proposed method was applied to the analysis of samples of sheepskin products, giving values of recovery in the ranges of 95.5%-97.3% for Pb, 93.9%-97.7% for Cr and 98.5%-99.3% for Co. Values of RSD′s (n=5) found were less than 5.0%.