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The two are unrelated. ppm means "parts per million", so the amount of grams for 1 ppm will also depend on the size of the sample. For example, if you have a sample of one ton, 1 ppm (a millionth of it) would be 1 gram; if your sample has a mass of one kilogram, 1 ppm would be 1 milligram, etc.
ppm stands for parts per minute.
10 ppm = 10/1,000,000 = 1/100,000 = 1/100,000*100% = 0.001%
Yes, micrograms per gram is the same as ppm. Ppm means parts per million. There are a million micrograms in a gram.
1 mg/kg = 1 ppm 1 mg = 1000 micrograms (ug) so 10 ug/kg = 0.01 mg/kg = 0.01 ppm