Miwa Takashi, Maruo Yasuko Yamada, Akaoka Kunihiko, Kunioka Tatsuya, Nakamura Jiro
Nippon Telegraph and Telephone Energy and Environment Systems Laboratories, Kanagawa, Japan.
J Air Waste Manag Assoc. 2009 Jul;59(7):801-8. doi: 10.3155/1047-3289.59.7.801.
Two types of colorimetric ozone detection paper with high resistance to ultraviolet (UV) light have been developed for outdoor ozone detection. These detection papers incorporate indigo carmine and UV absorbers (UVAs). When exposed to ozone, the papers change color from blue to white, and the ozone concentration can be determined by measuring the reflectance of the papers. However, indigo carmine is strongly affected by UV light, thus making the papers unsuitable for outdoor ozone detection. The authors succeeded in sufficiently improving the resistance of the papers to UV light for them to be used outdoors. This was achieved by using hydrophilic UVAs, namely sodium 2-hydroxy-4-methoxybenzophenone-5-sulfonate and ferulic acid. Without a UVA, the maximum measurement error of the papers derived from UV effect is approximately 290 parts per billion (ppb) x hr when one assumes 8 hr of UV exposure at low- to mid-latitudes (approximately 60 Wh/m2), and this error is too great for accurate ozone measurement. In contrast, the measurement errors of the papers with UVAs are only approximately 60-70 ppb x hr under the same conditions. Ozone measurement accuracies of these detection papers with UVAs are +/- 4.3-4.5% (coefficient of variation [CV]) at 25 degrees C and 60% relative humidity without UV effect. As a result, the improved ozone detection paper with high resistance to UV rays is suitable for outdoor ozone measurements (e.g., for detecting photochemical oxidants).
已开发出两种对紫外线（UV）具有高抗性的比色法臭氧检测试纸，用于室外臭氧检测。这些检测试纸含有靛蓝胭脂红和紫外线吸收剂（UVA）。当暴露于臭氧中时，试纸颜色会从蓝色变为白色，并且可以通过测量试纸的反射率来确定臭氧浓度。然而，靛蓝胭脂红受紫外线影响很大，因此使得这些试纸不适合用于室外臭氧检测。作者成功地充分提高了试纸对紫外线的抗性，使其能够用于室外。这是通过使用亲水性UVA，即2-羟基-4-甲氧基二苯甲酮-5-磺酸钠和阿魏酸来实现的。如果没有UVA，假设在低至中纬度地区（约60 Wh/m²）进行8小时紫外线照射，试纸因紫外线效应产生的最大测量误差约为290十亿分之一（ppb）×小时，并且这个误差对于精确的臭氧测量来说太大了。相比之下，在相同条件下，含有UVA的试纸的测量误差仅约为60 - 70 ppb×小时。在25摄氏度和60%相对湿度且无紫外线影响的情况下，这些含有UVA的检测试纸的臭氧测量精度为±4.3 - 4.5%（变异系数[CV]）。因此，改进后的具有高紫外线抗性的臭氧检测试纸适用于室外臭氧测量（例如，用于检测光化学氧化剂）。
