采用同步镀铋膜法修饰玻碳电极及差分脉冲溶出伏安法测试土壤中锰.以KNO_3为支持电解质,在NaOH-H_3BO_3(pH 5.5)缓冲溶液的铋膜上沉积锰溶出特征峰的峰电位为-1.1 V,沉积时间为180 s,测定锰的线性范围为0.02～60μg/L,线性方程为I=0.072 8C+1.935 7,相关系数为r=0.993 8,方法的检出限为0.001μg/L.对于10μg/L锰,用同一支铋膜电极平行测定10次,峰电流的RSD为2.4%.当共存的干扰离子浓度为500倍时,对测定无影响.该方法用于土壤中锰的测定,完成一个试样的测定只需4～5 min,回收率为95%～106%.
Trace manganese in soil was determined by differential pulse voltammetry with bismuth film modified glassy carbon electrode. With KNO_3 as the supporting electrolyte, the characteristic peak of Mn stripping on the bismuth film was determined in NaOH-H_3BO_3 buffer solution. The peak potential was 1.1 V. The depositing time was 180 s. The determination for Mn was sensitive for the linear con-centration range of 0.02～60 μg/L. The linear equation was expressed as I=0.072 8C+1. 935 7, r=0. 993 8. The detection limit was 0. 001 μg/L. Through 10 parallel determinations of 10 μg/L Mn so-lution by the same bismuth electrode, the RSD of peak current was obtained as 2.4 %. When the con-centration of coexisting ions was 500 multiples, they had no interference with the determination. In the deter-rnination of Mn in soil, it only takes 4-5 min to determine a sample. The recovery was 95%-106 %.
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