蔚山灣 및 流入水系의 重金屬 汚染度 調査

초록

Since 1962 when Ulsan City was proclaimed as a special industrial area by the cabinet order, industrial production, population, and size of industrial area have increased drastically showing 73.2% of annual industrial production increasement and 9.6% of annual population increasement. Accordingly, amount of waste disposal from industries and homes have increased to bring up socio-medical problems in terms of water pollution in the area, which has not been grasped exactly up to date especially concerning heavy metals. In view of the above reasons, a total of 45 water samples were taken at 18 sampling sites of 4 water system such as Taewha River, Byungyong River, Ulsan Bay and Oewhang River which passed through Ulsan City and of near sea from Ilsan Beach. With those samples, concentrations of Cd, Cr, Mn, Ni, and Pb were measured using an atomic-absorption spectrophotometer (Shimadzu AA-630-11) of which results were summarized as follows. 1. Concentration range of Cd was 1.0-5.5 ppb and the highest concentration was found in the samples from Ulsan Bay and Oewhang River. Range of Cr was 6-24 ppb and the highest data was found in Teawha River. Range of Mn was 13-50 ppb and the highest was found also in Teawha River. Range of Ni was 1-58 ppb and the highest was found in Oewhang River. As for Pb of which concentration was highest among othermetals, the range was 11-129 ppb and the highest was found in Oewhang River. 2. To grasp the general status of water pollution in terms of pollution order in general for the above 5 metals in thearea, semantic order scales were adopted and it was found that Oewhang River was the highest, Ulsan Bay to be the 2nd, Ilsan Near Sea the 3rd, Taewha River the 4th, and Byung Yong River the last. 3. Concerning correlation between each metal concentration by the above 5 water systems, Spearman's rank correlation coefficients of Mn-Cr and Ni-Cd was highest showing 0.9 (p=0.05). The next was found between Pb and Ni to be 0.8 (p=0.10).

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