how to convert mg/l to ppb?
['1 mg/L = 1000 ppb. 2 mg/L = 2000 ppb.', '3 mg/L = 3000 ppb. 4 mg/L = 4000 ppb.', '5 mg/L = 5000 ppb. 6 mg/L = 6000 ppb.', '7 mg/L = 7000 ppb. 8 mg/L = 8000 ppb.', '9 mg/L = 9000 ppb. 10 mg/L = 10000 ppb.', '11 mg/L = 11000 ppb. 12 mg/L = 12000 ppb.', '13 mg/L = 13000 ppb. 14 mg/L = 14000 ppb.', '15 mg/L = 15000 ppb. 16 mg/L = 16000 ppb.']