ppm means mg/L, remember that. so ppb would be micrograms per litre (basically multiplied by 1000). So 1500ppb is 1.5ppm or mg/L
Keep in mind the b means per billion and the m means million. It comes from assuming a density of 1g/ml, that a gram is equal to ml.
Therefore, g/l is parts per thousand, mg/l is per million, ug/l is per billion
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