Parts Per Billion (PPB) 3
Parts Per Billion (PPB) 3 :
Ratio of amounts expressed as parts of pesticide per 1,000,000,000 parts of sample. This is also expressed as g/kg. Strictly speaking, the quantities should be the same e.g. weight to weight (solids) or volume to volume (liquids or gases). It is also commonly used to describe ratios involving weight to volume but to avoid confusion here it is better to use g/l
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