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本文以苦味酸盐与硫化物之间的氧化还原反应为指示反应,采用苦味酸盐离子选择电极为指示电极,测量电极电位变化5mV所需的时间(t)。实验证明,1/t与硒含量在0.2～2.0μg/ml范围内线性关系良好,测定结果的相对偏差为6.3％。本文所选用的电极在本实验的具体条件下,性能良好,电极寿命可达半年以上。本法用于生物材料中痕量硒测定,获得了满意的结果。
In this paper, picrate and sulfide between the redox reaction as an indication of the reaction, the use of picrate ion selective electrode indicator electrode, measuring electrode potential change 5mV time (t). Experiments show that 1 / t and selenium content in the range of 0.2 ~ 2.0μg / ml good linearity, the relative deviation of the determination results was 6.3%. The electrode selected in this article under the specific conditions of this experiment, the performance is good, the electrode life of up to six months or more. This method is used for the determination of trace selenium in biological materials and obtained satisfactory results.