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本文提出了一种混凝土或砂浆中亚硝酸根离子含量的测定方法,在待测亚硝酸根离子含量的混凝土表面喷洒异氢酸酯显色液,干燥2～3h后,利用色差计输出明度L、色度a、b及色差△E值,可确定待测混凝土中亚硝酸根离子的大致浓度范围。本方法无需在混凝土表面喷洒酸性指示液,可对混凝土或砂浆中亚硝酸根离子进行半定量分析和测定,由于异氢酸酯显色液与亚硝酸根离子高特异性的识别能力,避免了其它离子的干扰,提高了检测准确度。
In this paper, a method for the determination of nitrite ion content in concrete or mortar is proposed. After being sprayed on the surface of the concrete with the content of nitrite ions to be sprayed for 2 to 3 hours, the color difference meter outputs the lightness L , Chromaticity a, b and color difference △ E values, to determine the approximate concentration range of nitrite ions in the concrete to be tested. The method does not need to spray acid indicator solution on the concrete surface to perform semi-quantitative analysis and determination of nitrite ions in concrete or mortar, and avoids the problem of high specific recognition ability of the iso-hydrogenate color developing solution and nitrite ion Interference of other ions, improve the detection accuracy.