CAJ | 학술논문

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Cr.在优化的实验条件下,以KNO_3为支持电解质,NaAc-HAc(pH=5.5)为缓冲溶液的铋膜上得到Cr溶出特征峰电位为-1.14V,线性方程为:I=0.0747C+0.31054,相关系数为0.9981,检出限为0.001μg/L,线性范围为0.01-60μg/L,RSD=2.47%.该方法简单快速.准确度和精密度均符合要求,回收率为96.7%-104.5%.
채용동보도필막법수식파탄전겁급차분맥충용출복안법측시토양중Cr.재우화적실험조건하,이KNO_3위지지전해질,NaAc-HAc(pH=5.5)위완충용액적필막상득도Cr용출특정봉전위위-1.14V,선성방정위:I=0.0747C+0.31054,상관계수위0.9981,검출한위0.001μg/L,선성범위위0.01-60μg/L,RSD=2.47%.해방법간단쾌속.준학도화정밀도균부합요구,회수솔위96.7%-104.5%.
Bismuth film modified glassy carbon electrode was prepared for the determination and chemical speciation analysis of a trace level of Cr in soil by differential pulse stripping voltammetry (DPSV).The sensitive stripping peaks of the ions were obtained and compared with that obtained using bismuth film electrodes in KNO_3 supporting electrolyte and NaAc-HAc (pH = 5.5) buffer solutions.The adsorptive stripping peaks potential of Cr is characteristic at -1.14V under the best condition.The linear equation is the following: I =0.0747C±0.31054, r=0.9981, the linear concentration is in the range of 0.01-60μg/L,the relative standard deviation (RSD)is 2.47%,and the recovery is about 96.7%-104.5%.