Objective To evaluate the uncertainty in determination of lead content in heat-sealed tea filter paper by graphite furnace atomic absorption spectrometry. Methods The lead content in the heat-sealed tea filter paper was measured by GB 31604.34-2016. Uncertainties introduced by the working curve, standard solution, sample repeat measurement, instrument, absorbance quantification error, digestion recovery rate and sample weighing process were calculated, and a mathematical model was established to calculate the synthetic uncertainty. Results The uncertainty of determination of lead in heat-sealed tea filter paper by graphite furnace atomic absorption spectrometry was 0.10 mg/kg. Conclusion The main sources of uncertainty affecting the test results are the calibration curve and the digestion recovery rate.
标题：石墨炉原子吸收光谱法测定热封型茶叶滤纸中铅含量的不确定度评定
英文标题：Uncertainty evaluation of determination of lead content in heat-sealed tea filter paper by graphite furnace atomic absorption spectrometry
