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A trace element is considered is a specific element that contains less than 100 parts per million in a sample. In this case, the sample is seawater.

According to my understanding, the presence of iodine is very limited in seawater. There is only 0.05 parts per million of iodine in seawater.

As such, iodine is considered a trace element in seawater.

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Q: Why is iodine considered a trace element in seawater?
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