CDPH Lead Inspector/Assessor California State Practice Exam

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What is the conversion of 1 μg/g to ppm?

0.1 ppm
1 ppm
10 ppm
100 ppm

The correct answer is: 1 ppm

To understand the conversion of 1 μg/g to parts per million (ppm), it's essential to recognize the relationship between these units. 1 μg/g is equivalent to 1 microgram of a substance per gram of a material. Since 1 gram is equal to 1,000,000 micrograms, when you have 1 μg/g, this means that in 1 gram of a material, there is 1 microgram of the substance. Now, when we express concentrations in ppm, it's understood that 1 ppm indicates 1 part of the substance per 1 million parts of the material. In this case, since we have 1 μg in 1 g (or 1,000,000 μg), we can see that having 1 μg in 1 g translates directly to 1 ppm in a solution of that weight. Thus, the correct conversion from 1 μg/g to ppm is indeed 1 ppm, confirming why this is the correct answer.