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中文摘要：
从亚硝酸根离子与对氨基苯磺酸和盐酸萘乙二胺作用生成红色化合物的数码成像中,可以明显看出随着亚硝酸根离子浓度的增加溶液的颜色加深。用Origin 7.0软件把数码成像的JPEG格式转换成灰度格式,然后用Scion Image软件读数,数码成像中不同颜色深度的灰度值亦随着亚硝酸根离子浓度的增加而增加。由此建立了数码成像比色（DIC）法测定大气中氮氧化物（NOx）含量的新方法。根据红、绿、蓝（RGB）三基色原理探讨了数码成像比色法的原理,考察了数码成像比色法的影响因素,并成功用于合成样和大气中氮氧化物日变化曲线的测定,其结果与分光光度法一致。用于合成样的测定,回收率在97.3%～104.0%之间,相对标准偏差（RSD）小于5.0%。
英文摘要：
From the digital images of the red complex which resulted in the interaction of nitrite with N-（1-naphthyl） ethylenediamine dihydroehloride and P-Aminobenzene sulfonic acid, it could be seen that the solution colors obviously increased with increasing the concentration of nitrite ion. The JPEG format of the digital images was transformed into gray-scale format by origin7.0 software, and the gray values were measured with scion image software. It could be seen that the gray values of the digital image obviously increased with increasing the concentration of nitrite ion, too. Thus a novel digital imaging eolorimetric （DIC） method to determine nitrogen oxides （NOx） contents in air was developed. Based on the red, green and blue （RGB） tricolor theory, the principle of the digital imaging colorimetric method and the influential factors on digital imaging were discussed. The present method was successfully applied to the determination of the daily changes curve of nitrogen oxides in the atmosphere and NO2- in synthetic samples with the recovery of 97.3%-104. 0%, and the relative standard deviation （RSD） was less than 5.0%. The results of the determination were consistent with those obtained by speetrophotometrie method.
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