[Direct determination of manganese in urine by Graphite Furnace Atomic Absorption Spectrometry].

Objective: To establish a method for the determination of manganese in urine by graphite furnace atomic absorption spectrometry (AAS) without the use of matrix modifier. Methods: The urine samples were 5 times diluted with 1% nitric acid then directly determined by AAS. Zeeman was used for background correction. Results: The linear range for determination of manganese in urine was 5~60 μg/L (urine) . The correlation coefficient was greater than 0.995 with the detection limit of 1.5 μg/L and with the lower limit of quantification of 5.0 μg/L. The relative standard deviations (RSDs) of within-run precision was between 1.1%~4.3%, the RSDs of between-run precision was between 3.3%~7.0%. The average recovery was 102.6%. The samples can be stored for 14 days at room temperature, 4℃, -8 ℃ and -35 ℃. Conclusion: The method is feasible for determination of manganese in urine.目的： 建立不添加基体改进剂稀释后直接进样测定尿中锰石墨炉原子吸收测定方法。 方法： 尿样经1%硝酸5倍稀释后直接测定，使用塞曼进行背景校正。 结果： 本方法测定尿中锰的线性范围为5.0~60.00 μg/L（以尿液计），相关系数为>0.995，检出限为1.5 μg/L，定量下限为5.0 μg/L。方法的批内精密度为1.1%~4.3%，批间精密度为3.3%~7.0%，平均回收率为102.6%。样品在室温、4 ℃、-8 ℃、-35 ℃的条件下均可以保存14 d。 结论： 本方法适用于尿中锰含量的测定。.