应用硝酸作基体改进剂 ,石墨炉原子吸收光谱法直接测定尿中痕量锰。方法简便、快速、准确 ,灵敏度高。方法的检出限为 0 .0 80 μg·L- 1,回收率为 97.2 %。对锰含量为 5 μg·L- 1的尿样测定 7次的相对标准偏差为 3.16% Nitric acid was used as matrix modifier to directly determine trace manganese in urine by graphite furnace atomic absorption spectrometry. Method is simple, fast, accurate, high sensitivity. The detection limit of the method was 0.080 μg · L -1 and the recovery rate was 97.2%. The relative standard deviation (RSD) of seven urine samples with a manganese content of 5 μg · L -1 was 3.16%