Naslov
Measurements of ozone in the Zagreb air

Autori
Pehnec, Gordana ; Vađić, Vladimira ; Hršak, Janko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
New achievements in chromatography, Book of Abstracts / Šegudović, Nikola - Zagreb : Hrvatsko društvo kemijskih inženjera i tehnologa (HDKI), 2000

Skup
6th International Symposium New achievements in chromatography

Mjesto i datum
NP Plitvička jezera, Hrvatska, 11.10.2000. - 13.10.2000

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Sažetak
In urban areas ozone is formed through photochemical reactions of nitrogen oxides and volatile organic compounds. As a strong oxidant, it may cause harmful health effects and damages on plants and materials. Measurements of ozone usually include automatic devices based on UV absorption, which are expensive and technically demanding. For that reason manual chemical methods for active and passive sampling of ozone are often used. Such methods have low cost and don't demand sophisticated equipment. Manual method used in this work is based on active sampling of ozone in the carbonate alkali absorption solution of sodium nitrite (airflow 0.2-0.5 L/min). Nitrite ion reacts with ozone forming nitrate. Nitrate ion is determined by ion chromatography using Dionex Ion Pac AG14 precolumn and Ion Pac AS14 column (eluent: 3.5 mM Na2CO3 / 1,0 mM NaHCO3, flow rate 1.2 mL/min). Parallely, during more than one year automated UV absorption measurements were carried out. The results showed that there was no statistically significant difference between these two methods (P<0.05). Precision of described active method is better than the precision of similar passive methods found in literature. Limit of detection is 0.02 mg/mL NO3-, which corresponds to 0.5 mg/m3 of ozone in the air for sampling period of 24 h, flow rate of 0.3 L/min and volume of absorption solution of 15 mL. Concentrations of ozone were measured in Zagreb at four measuring sites during 1999 and 2000 by the active method described above. Values between 0.5 mg/m3 and 122 mg/m3 of ozone were obtained. However, at all four stations concentrations of ozone did not trespassed the limit value for 98th percentille given in the Ordinance on Recommended and Limit Air Quality Values.

Izvorni jezik
Engleski

Znanstvena područja
Javno zdravstvo i zdravstvena zaštita

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