Carbamates are common insecticide ingredients that inhibit cholinesterase activity, causing acute muscarinic manifestations. It is found that a sample of 250.0 g of water in the Amazon river contains 45.10 μmole of carbamates. The density of the river water is 0.9971 g/mL. Express the insecticide concentration in parts per billion. Round your answer to 1 decimal place.

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