Environmental analytical methods

Naphthalene emissions from moth repellents or toilet deodorant blocksdetermined using head-space and small-chamber tests

JO Wan-Kuen , LEE Jong-Hyo , LIM Ho-Jin , JEONG Woo-Sik


Received August 30, 2007,Revised March 18, 2008, Accepted , Available online

Volume 20,2008,Pages 1012-1017

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The present study investigated the emissions of naphthalene and other compounds from several di erent moth repellents (MRs) and one toilet deodorant block (TDB) currently sold in Korea, using a headspace analysis. The emission factors and emission rates of naphthalene were studied using a small-scale environmental chamber. Paper-type products emitted a higher concentration of the total volatile organic compounds (VOCs) (normalized to the weight of test piece) than ball-type products, which in turn emitted higher concentration than a gel-type product. In contrast, naphthalene was either the most or the second highest abundant compound for the four ball products, whereas for paper and gel products it was not detected or was detected at much lower levels. The abundance of naphthalene ranged between 18.4% and 37.3% for ball products. The results showed that the lower the air changes per hour (ACH) level was, the higher the naphthalene concentrations became. In general, a low ACH level suggests a low ventilation rate. The emission factor for naphthalene was nearly 100 times higher for a ball MR than for a gel or a paper MR. For the ball MR, the lower ACH level resulted in higher emission rate.

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