CN1020168C - 亚硝酸根离子的测定方法 - Google Patents

亚硝酸根离子的测定方法 Download PDF

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CN1020168C
CN1020168C CN 90102835 CN90102835A CN1020168C CN 1020168 C CN1020168 C CN 1020168C CN 90102835 CN90102835 CN 90102835 CN 90102835 A CN90102835 A CN 90102835A CN 1020168 C CN1020168 C CN 1020168C
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gas
absorption
ultraviolet light
sample
determination method
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CN1055603A (zh
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臧平安
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Baoshan Iron and Steel Co Ltd
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SHANGHAI BAOSHAN IRON AND STEEL GENERAL PLANT
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Abstract

亚硝酸根离子的测定,是在酸性介质中,加入脂肪族醇类或醛类物质作催化剂,进行催化反应作用,使酸性介质中的NO2 -迅速转化成NO2气体,由于NO2气体对200~300nm波长的紫外光吸收强度与NO2 -浓度呈良好的定量关系,因此根据NO2 -的气态分子吸收原理,可以用原子吸收光谱仪、UV分光光度计或测录仪等,对NO2 -进行定量测定。

Description

本发明是关于测定NO- 2离子的方法。
由于环境污染的逐渐严重,对生活用水和工业用水中的NO- 2含量进行准确、快速、简便的测定,成为日益迫切的问题。在现有测定NO- 2的方法中,存在测定方法复杂、测定周期较长、干扰多等问题。测定NO- 2离子的方法有:Griess与Griess-Saltzman光度法、电化学法、气相色谱法、高效液相色谱法、萤光光度法及紫外分光光度法等。日本专利特开昭56-128457“NO- 3与NO- 2测定法”,就是采用紫外分光光度法,其方法是利用NO- 3与NO- 2对200~230nm波长紫外光的吸收原理,在专用的紫外分光光度计上测定。由于NO- 3和NO- 2对200~230nm波长紫外光均产生吸收,因此,需将NO- 3和NO- 2通过氢型强酸性阳离子交换树脂的离子交换柱,使NO- 3和NO- 2先后从交换柱中流出,分别连续测定;为了有利NO- 3和NO- 2更好地分离,加入脂肪族醇、二氧杂环己烷、乙晴等以降低交换柱中的介电常数,从交换柱流出的NO- 3和NO- 2先后进入设定在210nm波长的检测器,在液相中测定NO- 3与NO- 2对紫外光的吸收,进行定量测定。若用此法单独进行NO- 2的测定,只能先进行NO- 3和NO- 2的分离。该方法在分离过程中虽然能通过阳离子交换柱消除阳离子的干扰,但不能完全消除阴离子的干扰,而且测定周期较长,测定一只样品需30分钟。
本发明是在酸性介质中借催化剂的作用,使NO- 2迅速分解,转化成NO2气体,利用NO2气体对200~300nm波长的紫外光吸收原理进行定量测定。
本发明是将样品在反应瓶中酸化后,加入催化剂(脂肪族醇或醛),使样品中的NO- 2迅速转化成NO2气体,再用空气将其导入吸光池,测定出NO2的吸收强度,此强度与NO- 2浓度呈良好的定量关系,因此,利用NO2气体对200~300nm波长紫外光的吸收原理,可以用原子吸收光谱仪、UV分光光度计或测汞仪等进行NO- 2的定量测定。在催化反应中,NO- 3不被催化、不生成NO2气体,因此避免了NO- 3和NO- 2的分离程序及NO- 2的干扰。由于本发明是使NO- 2分解成NO2转入气相,然后对NO2气体进行气态分子吸收的测定,所以,绝大部分阴、阳离子不转入气相,因此测定不受干扰。
本发明测定精度高,可定量测定NO- 2的动态浓度为0.01~5000ppm,而且,测定一只样品仅需2~3分钟。
本发明的实施例如下:
按附图1连接测定装置,事先根据被测样品中NO- 2的大体含量,选择并予热不同发射线的空心阴极灯光源,待仪器稳定,在洁净的反应瓶4中加入适量被测水样及H2SO4,使之保持2.5mol/l的酸度,体积为5ml,再用定量加液器5加入0.5ml乙醇,然后启动空气泵1,经净化器2由流量计3使净化空气进入反应瓶4,使所产生的NO2气体载入吸光池7中进行测定。用记录仪记录NO2的分子吸收峰,用相应的NO- 2标准溶液在相同条件下进行测定,以标准曲线法计算出水样中NO- 2的含量。测定结果如表1。
表1 本法与现有方法测定NO- 2结果对比
被测样品名称 NO- 2含量PPM 对照方法所测含量PPM 对照方法名称
长江水    0.083    0.080    对氨基苯磺酸-α奈胺比色法
工业水(甲)    0.011    0.013    对氨基苯磺酸-α奈胺比色法
工业水(乙)    0.031    0.030    对氨基苯磺酸-α奈胺比色法
冷循环水    304.0    305.0    醋酸苯胺-α奈胺比色法
冷循环盐水(甲) 2436 2491 KMnO4氧化容量法
冷循环盐水(乙) 2067 2037 KMnO4氧化容量法
图1
1.空气泵    2.净化器    3.流量计    4.反应瓶
5.定量加液器    6.干燥管    7.吸光池    8.净化器

Claims (3)

1、一种亚硝酸根离子的测定方法,其特征在于,将催化剂加入被测样品的酸性介质中,使样品中的NO- 2迅速转化成NO2气体,利用NO2气体对200~300nm波长紫外光的吸收原理及NO2气体对紫外光的吸收强度与NO- 2浓度呈良好的定量关系,进行NO- 2的定量测量。
2、根据权利要求1所述的测定方法,其特征在于,加入被测样品中的催化剂为脂肪族醇或醛。
3、根据权利要求1或2所述的测定方法,其特征在于,转化成的NO2气体,用空气将其导入吸光池,再测定NO2气体对紫外光的吸收强度。
CN 90102835 1990-04-06 1990-04-06 亚硝酸根离子的测定方法 Expired - Fee Related CN1020168C (zh)

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CN101975756B (zh) * 2010-10-15 2012-03-21 赵建平 一种分子光谱吸收法快速测定水中高锰酸盐指数的方法
CN113640239B (zh) * 2021-08-24 2023-10-24 厦门大学深圳研究院 一种硝酸盐和亚硝酸盐的分光光度法检测方法

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