Tracer Study of Organic Poisons in the Ship Bottom Paint:Measurement of the Leaching Rate of DDT by <SUP>14</SUP>C Tracer Technique
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概要
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<I>The DDT leaching rate was measured by</I> <SUP>14</SUP>C-<I>tracer technique after various times of soaking in the running sea and city water both at the flow rate of</I> 500 ml/min. <I>As a paint, vinyl ship bottom paint No. 2 containing</I> 20% <I>DDT labelled with</I> <SUP>14</SUP>C (<I>specific activity</I> 50μCi/g) <I>was used. The leaching rate decreases rapidly with aging in the sea water and reaches a constant value of</I> 0.45μg <I>DDT</I>/cm<SUP>2</SUP>⋅day <I>after about two months. Similar result obtained as to the city water. The weight of paint decreases with increasing soaking time and the rate is fast at the beginning. The percentage of DDT in the leached part of the paint is found to be less than</I> 10%, <I>about one third of the initial composition. The microscopic feature of the paint surface after the aging for</I> 180 days <I>in the sea water differs from that in the city water. In the sea water, it looks spongy and in the other case, it looks rough but not spongy. It is proved that the leaching rate of</I> DDT <I>in the ship bottom paint can be determined by</I> <SUP>14</SUP>C-<I>tracer technique accompanied withi extraction method</I>.
- 社団法人 日本アイソトープ協会の論文
社団法人 日本アイソトープ協会 | 論文
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