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将薄层大面积玻碳电解池与小面积玻碳电解池以串联方式连接,在程控状态下使用。铅离子首先在大面积玻碳汞膜电极(LGCE)上预富集,溶出后在小面积玻碳汞膜电极(SGCE)上两次富集,因此提升了SGCE富集效率。测量25.0μg/L铅标准溶液,峰高的相对标准偏差RSD=1.2%。测量铅含量为25.6μg/L的尿样,测得值27.4μg/L,相对标准偏差RSD=2.3%。富集时间400 s检出限为0.008 8μg/L;定量检测限为0.029 2μg/L。与常规的溶出分析比较,检出限降低11.90倍,显著提高检测的灵敏度。流动式电解池在溶出时的底液中不含样品基体。
The thin-layer large-area glassy carbon cells and small area glassy carbon cells connected in series, the program-controlled state. Lead ions were first pre-enriched on a large area glassy carbon mercury film electrode (LGCE) and eluted twice on a small area glassy carbon mercury electrode (SGCE), thereby enhancing the SGCE enrichment efficiency. The standard solution of 25.0 μg / L lead was measured and the relative standard deviation (RSD) of peak height was 1.2%. Urine samples with a lead content of 25.6 μg / L were measured, with a value of 27.4 μg / L and a relative standard deviation of RSD of 2.3%. The detection limit of enrichment time of 400 s was 0.008 8 μg / L and the limit of quantitation was 0.029 2 μg / L. Compared with the conventional dissolution analysis, the detection limit decreased 11.90-fold, significantly improving the detection sensitivity. Flow cell in the dissolution of the bottom of the liquid sample matrix is not included.