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采用离子选择性电极分析技术,在硫酸铝-硫酸银-硼酸-氨基磺酸离子强度剂体系中对锡酸钠、砷酸液等两种物料中的硝酸盐进行检测。用稀酸碱沉淀分离不大于0.80g锡酸根或25mg铁、锑、钙,200mg砷不产生干扰,硝酸盐浓度在3.23×10-5mol/L～1.61×10-2mol/L内电极响应符合能斯特方程式(斜率≥90%),检测下限可达1.61×10-5mol/L,相对标准偏差(m=6,n=5～11)为1.44%～9.64%,加标回收率为86.0%～123.4%。
The nitrate ion in two kinds of materials, sodium stannate, arsenic acid and so on, was detected by ion selective electrode analysis in aluminum sulfate-silver sulfate-boric acid-sulfamic acid ionic strength agent system. With dilute acid-base precipitation separation of not more than 0.80g stannate or 25mg iron, antimony, calcium, 200mg arsenic did not interfere with the nitrate concentration 3.23 × 10-5mol / L ~ 1.61 × 10-2mol / L electrode response to meet the energy The relative standard deviation (m = 6, n = 5 ~ 11) was 1.44% ~ 9.64% with the detection limit of 86.0% ~ 123.4%.