Investigation Of Sampling And Determination Of Ozone In Environment

Nowadays, there are many research literatures about the collection and detection of various environmental polluting gas, especially, the detection of environmental air quality in museum becomes much more attractive. Ozone, as environment atmosphere gas, although the concentration is relative less, it is important and its collection and detection studies are also little. Here, our investigation (article) mainly aims at the environmental sampling method and testing methods for determining the ozone in the museum air. by using spectrophotometry and ion chromatograpy.For spectrophotometry, there are appropriate improvements that based on the original GB/T18204.27-2000. With passive sampling, using indigodisulfonate dipotassium salt as the main absorbing matter because of itsbetter stability we study the factors like blank preservation, sampling repeatability and different filter for samplingaffecting the results. Compared with active sampling method according to the national stardand, the passive sampling got the absorption coefficient is aIDS=0.219×10-3(m3/h). The gas concentration which is detected by passive sampling method can be converted into practical ozone concentration in atmosphere, enlarging the value of this method.For ion chromatography(IC), according to the previous report, Dionex-320 with RFC-30, column IonPac AS 18 and different gradient elution methods were chosen as the instrument conditions, which can provide better anions separation of anions in research. Using passive sampling, our innovation is that the alkaline was added into absorbing liquid, designing an innovative method which can absorb atmosphere ozone and collect the airborne acidic gas (formic acid, acetic acid) at the same time. We investigated the repeatability of standard samples and text samples, respectively. The stability within 12 hours after sampling, the sampling parallel, recovery, sampling recovery etc, determining the limit detection(the limit detection of formic acid, acetic and nitrate all are below 7.0 g/L), getting the curve of sampling time and concentration. Compared with conventional detection methods which used to determin the formic acid and acetic acid, using new absorbing solution to detect acid gas was also feasible. Compared with active sampling method of the national stardand, we got the absorption coefficient of "passive samples-spectrophotometric" is aIC=0.705×10-3(m3/h). Compared with the traditional ozone detection methods, the new method not only suitable for detection of atmosphere ozone but also can monitor environment formic acid and acetic acid. Furthermore,questioned the chemical equation for indigodisulfonate salt and ozone. Through the above study, a new method to detect the ozone in museum environment was established. The advantages of this method is simple, high sensitivity, low detection limit, good linear and has high practical value, making important contributions for the gas detection in museum environment.