There are 5,000,000 nanolitres in 5ml. This is because there are 1,000,000 nanolitres in 1 millilitre.
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5 microlitres in 50 millilitres
= 5 microlitres in 50,000 micorlitres
5 in 50,000 = 1 in 10,000 = 100 in 1 million
So the answer is 100 ppm.