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本文讨论应用流动注射分析结合光度测定进行低亚硫酸钠(保险粉)的测试。所采用的载流为K_2Cr_2O_710g溶解于111.8×10~(-1)mol/l的H_2SO_4溶液,流速为2.8ml/min。在590nm处测其吸光度。试样通过填有海绵的玻璃管直接抽吸入FIA仪器进行测定。与传统的碘量法相比,其相对误差小于1.5％。数据表明有良好的重现性。
This article discusses the use of flow injection analysis combined with photometric determination of sodium hypo (sodium sulfite) tests. The carrier flow used was K_2Cr_2O_710g dissolved in 111.8 × 10 ~ (-1) mol / l H_2SO_4 solution, the flow rate was 2.8ml / min. The absorbance was measured at 590 nm. The sample was drawn directly into the FIA instrument through a glass tube filled with sponge. Compared with the traditional iodometric method, the relative error is less than 1.5%. The data shows good reproducibility.