痕量亚硝酸根的聚氯乙烯液态膜四氯络铁(Ⅲ)离子电极测定  

Determination of Trace Nitrite with Ferric Tetrachloride Anion Selective Electrode

作　　者：曾云龙[1] 唐春然[1] 

机构地区：[1]邵阳师范高等专科学校化学系激光技术和新材料研究所,湖南邵阳422000

出　　处：《分析测试学报》2000年第6期56-58,共3页Journal of Instrumental Analysis

摘　　要：以新型阴离子载体Ｓ－烷基双硫腙，制备了ＦｅＣｌ４－阴离子选择性电极，研究了电极的性能。确定了亚硝酸催化氧化时Ｆｅ２＋的最佳反应条件，在４ｍｏｌ／Ｌ ＮａＣｌ－ ０．２ ｍｏｌ／Ｌ ＨＣｌ介质中反应 ５０ｍｉｎ时以尿素终止。反应生成的Ｆｅ（Ⅲ）以ＦｅＣｌ４－选择性电极电位法测定，间接测定ＮＯ２－。线性范围为１５～３５０μｇ／Ｌ ＮＯ２－，检出限为８μｇ／Ｌ。该法应用于雪水和水样中亚硝酸根的测定，结果与光度法一致。Ferric tetrachloride anion selective electrode was prepared based on a new type of carrier S- alkyl diphenylthiocarbazone bromides. The characteristics of the eletrode were investigated. The opti- mum conditions of the oxidation reaction of Fe(Ⅱ) catalyzed by nitrite were determined. In 4 mol/L NaCl - 0. 2mol/L HCl solution Fe(Ⅱ) is catalytically oxidized to form Fe(Ⅲ)for 50 min at 16℃, then the reaction ends wilh urea. Nitrite was determined indirectly by determination of Fe(Ⅲ) with poten- tiometer by using the electrode. The linear range of the method is in the range of 15 - 350 μg/L for nitrite with the limt detection of 8 μg/L. The method was used for the determination of nitrite in snow and water. The results agree well with those determined by spectrophotometric methed.

关 键 词：亚硝酸根 水 离子选择性电极 测定 雪水 

分 类 号：O613.61[理学—无机化学] O657.1[理学—化学]