研究了石墨炉原子吸收分光光度法测定固体废物中钡的方法。确定了石墨管类型、最佳升温程序和酸消解体系等的测定条件，并通过实际样品检测验证了方法的可行性。结果表明，采用热解涂层石墨管，当溶液钡浓度为0～50μg∕L，最佳灰化温度为1000℃，最佳灰化时间为8．0 s，最佳原子化温度为2600℃，最佳原子化时间为2．8 s时，钡浓度与吸光度呈良好的线性关系，相关系数为0．9991，方法检出限为2．7 mg∕kg，相对标准偏差为2．7％～5．4％，实际样品的加标回收率为89．5％～94．5％。%A method for determination of barium in solid wastes by graphite furnace atomic absorption spectrophotometry was studied .The optimal measurement conditions of the graphite tube type , heating program and acid digestion system were determined , and the feasibility of this method validated by test of actual samples .The results showed that with pyrolytic coated graphite tube and at the ashing temperature of 1 000℃, the ashing time of 8.0 s, the atomization temperature of 2 600 ℃ and the atomization time of 2.8 s, the concentration of barium showed a linear relationship with the absorbance , with the correlation coefficient of 0 .999 1 .The detection limit of barium was 2.7 mg∕kg, the relative standard deviation was between 2.7%and 5.4%, and the recovery rate of the actual samples was between 89 .5%and 94 .5%.
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